Merge release 1.0.0 into stable branchHEADstable

See the tag 'v1.0.0' or the changelog for more information about this
release.

4 files changed, 500 insertions, 309 deletions

diff --git a/src/test/java/sevenUnits/unit/MultiUnitTest.java b/src/test/java/sevenUnits/unit/MultiUnitTest.java
deleted file mode 100644
index 949a1f1..0000000
--- a/src/test/java/sevenUnits/unit/MultiUnitTest.java
+++ /dev/null
@@ -1,110 +0,0 @@
-/**
- * Copyright (C) 2020 Adrien Hopkins
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package sevenUnits.unit;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-import java.util.Arrays;
-import java.util.List;
-import java.util.Random;
-import java.util.concurrent.ThreadLocalRandom;
-
-import org.junit.jupiter.api.Test;
-
-/**
- * Tests related to the {@code MultiUnit}.
- *
- * @since 2020-10-03
- */
-class MultiUnitTest {
-
-	/**
-	 * Ensures that the {@code MultiUnit} can convert properly.
-	 */
-	@Test
-	final void testConvert() {
-		final Random rng = ThreadLocalRandom.current();
-		final MultiUnit footInch = MultiUnit.of(BritishImperial.Length.FOOT,
-				BritishImperial.Length.INCH);
-
-		assertEquals(1702.0,
-				footInch.convertTo(Metric.METRE.withPrefix(Metric.MILLI),
-						Arrays.asList(5.0, 7.0)),
-				1.0);
-
-		for (int i = 0; i < 1000; i++) {
-			final double feet = rng.nextInt(1000);
-			final double inches = rng.nextDouble() * 12;
-			final double millimetres = feet * 304.8 + inches * 25.4;
-
-			final List<Double> feetAndInches = Metric.METRE
-					.withPrefix(Metric.MILLI).convertTo(footInch, millimetres);
-			assertEquals(feet, feetAndInches.get(0), 1e-10);
-			assertEquals(inches, feetAndInches.get(1), 1e-10);
-		}
-	}
-
-	/**
-	 * Test method for {@link sevenUnits.unit.MultiUnit#convertFromBase(double)}.
-	 */
-	@Test
-	final void testConvertFromBase() {
-		final Random rng = ThreadLocalRandom.current();
-		final MultiUnit footInch = MultiUnit.of(BritishImperial.Length.FOOT,
-				BritishImperial.Length.INCH);
-
-		// 1.7 m =~ 5' + 7"
-		final List<Double> values = footInch.convertFromBase(1.7018);
-
-		assertEquals(5, values.get(0));
-		assertEquals(7, values.get(1), 1e-12);
-
-		for (int i = 0; i < 1000; i++) {
-			final double feet = rng.nextInt(1000);
-			final double inches = rng.nextDouble() * 12;
-			final double metres = feet * 0.3048 + inches * 0.0254;
-
-			final List<Double> feetAndInches = footInch.convertFromBase(metres);
-			assertEquals(feet, feetAndInches.get(0), 1e-10);
-			assertEquals(inches, feetAndInches.get(1), 1e-10);
-		}
-	}
-
-	/**
-	 * Test method for
-	 * {@link sevenUnits.unit.MultiUnit#convertToBase(java.util.List)}.
-	 */
-	@Test
-	final void testConvertToBase() {
-		final Random rng = ThreadLocalRandom.current();
-		final MultiUnit footInch = MultiUnit.of(BritishImperial.Length.FOOT,
-				BritishImperial.Length.INCH);
-
-		// 1.7 m =~ 5' + 7"
-		assertEquals(1.7018, footInch.convertToBase(Arrays.asList(5.0, 7.0)),
-				1e-12);
-
-		for (int i = 0; i < 1000; i++) {
-			final double feet = rng.nextInt(1000);
-			final double inches = rng.nextDouble() * 12;
-			final double metres = feet * 0.3048 + inches * 0.0254;
-
-			assertEquals(metres,
-					footInch.convertToBase(Arrays.asList(feet, inches)), 1e-12);
-		}
-	}
-}
diff --git a/src/test/java/sevenUnits/unit/UnitDatabaseTest.java b/src/test/java/sevenUnits/unit/UnitDatabaseTest.java
index 9d650f0..3d6d663 100644
--- a/src/test/java/sevenUnits/unit/UnitDatabaseTest.java
+++ b/src/test/java/sevenUnits/unit/UnitDatabaseTest.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2019 Adrien Hopkins
+ * Copyright (C) 2019, 2021, 2022, 2024, 2025 Adrien Hopkins
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -23,20 +23,21 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.api.Assertions.fail;
 
 import java.io.IOException;
-import java.io.InputStream;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.Map.Entry;
 import java.util.NoSuchElementException;
 import java.util.Objects;
 import java.util.Set;
+import java.util.stream.Stream;
 
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
 import org.junit.jupiter.params.provider.ValueSource;
 
 import sevenUnits.utils.NameSymbol;
@@ -45,7 +46,7 @@ import sevenUnits.utils.UncertainDouble;
 /**
  * A test for the {@link UnitDatabase} class. This is NOT part of this program's
  * public API.
- * 
+ *
  * @author Adrien Hopkins
  * @since 2019-04-14
  * @since v0.2.0
@@ -57,8 +58,8 @@ class UnitDatabaseTest {
 		private V value;
 
 		/**
-		 * 
 		 * @since 2021-10-07
+		 * @since v0.3.2
 		 */
 		public SimpleEntry(K key, V value) {
 			this.key = key;
@@ -94,7 +95,7 @@ class UnitDatabaseTest {
 
 		@Override
 		public V setValue(V value) {
-			final V oldValue = this.value;
+			final var oldValue = this.value;
 			this.value = value;
 			return oldValue;
 		}
@@ -135,6 +136,7 @@ class UnitDatabaseTest {
 	 * @param value value in entry
 	 * @return entry
 	 * @since 2021-10-07
+	 * @since v0.3.2
 	 */
 	private static <K, V> Map.Entry<K, V> entry(K key, V value) {
 		return new SimpleEntry<>(key, value);
@@ -146,14 +148,18 @@ class UnitDatabaseTest {
 	 *
 	 * @param loadTo database to load to
 	 * @param path   path of file to load
+	 * @return exceptions returned by file loading
 	 * @since 2021-10-04
+	 * @since v0.3.2
 	 */
-	private static void loadDimensionFile(UnitDatabase loadTo, String path) {
-		try (final InputStream testFile = UnitDatabaseTest.class
+	private static List<LoadingException> loadDimensionFile(UnitDatabase loadTo,
+			String path) {
+		try (final var testFile = UnitDatabaseTest.class
 				.getResourceAsStream(path)) {
-			loadTo.loadDimensionsFromStream(testFile);
+			return loadTo.loadDimensionsFromStream(testFile);
 		} catch (final IOException e) {
 			fail(e.getClass() + " occurred upon loading file \"" + path + "\".");
+			return Collections.emptyList();
 		}
 	}
 
@@ -163,26 +169,89 @@ class UnitDatabaseTest {
 	 *
 	 * @param loadTo database to load to
 	 * @param path   path of file to load
+	 * @return exceptions returned by file loading
 	 * @since 2021-09-22
+	 * @since v0.3.2
 	 */
-	private static void loadUnitsFile(UnitDatabase loadTo, String path) {
-		try (final InputStream testFile = UnitDatabaseTest.class
+	private static List<LoadingException> loadUnitsFile(UnitDatabase loadTo,
+			String path) {
+		try (final var testFile = UnitDatabaseTest.class
 				.getResourceAsStream(path)) {
-			loadTo.loadUnitsFromStream(testFile);
+			return loadTo.loadUnitsFromStream(testFile);
 		} catch (final IOException e) {
 			fail(e.getClass() + " occurred upon loading file \"" + path + "\".");
+			return Collections.emptyList();
 		}
 	}
 
+	private static final Stream<Arguments> testEvaluateExpressionInvalid() {
+		return Stream.of(Arguments.of("K^K"), Arguments.of("1 + K"));
+	}
+
+	private static final Stream<Arguments> testEvaluateExpressionValid() {
+		final var uncertainTwoThirds = UncertainDouble.of(2.0, 1.0)
+				.dividedBy(UncertainDouble.of(3.0, 1.0));
+		return Stream.of(
+				Arguments.of("J + (2 * 3) J + (20 / 4) J",
+						LinearUnitValue.of(J,
+								UncertainDouble.of(12, Math.sqrt(14.625)))),
+				Arguments.of("J + 2 * 3 * J + 20 / 4 * J",
+						LinearUnitValue.of(J,
+								UncertainDouble.of(12, Math.sqrt(14.625)))),
+				Arguments.of("J - -1 * J",
+						LinearUnitValue.of(J, UncertainDouble.of(2, 1))),
+				Arguments.of("K^2",
+						LinearUnitValue.of(K.times(K), UncertainDouble.of(1, 0))),
+				Arguments.of("2 J / 3 J",
+						LinearUnitValue.of(J.dividedBy(J), uncertainTwoThirds)));
+	}
+
+	private static final Stream<Arguments> testFormatExpression() {
+		return Stream.of(Arguments.of("1*2", "1 * 2"),
+				Arguments.of("1/2", "1 / 2"), Arguments.of("1|2", "1 | 2"),
+				Arguments.of("1^2", "1 ^ 2"), Arguments.of("1  *   2", "1 * 2"),
+				Arguments.of("+1", "+1"), Arguments.of("-1", "-1"),
+				Arguments.of("1.1e+5", "1.1e+5"),
+				Arguments.of("1.25e-5", "1.25e-5"));
+	}
+
+	/**
+	 * Tests expressions that are valid to the parser, but semantically invalid
+	 * (e.g. adding different dimensions)
+	 *
+	 * @param expression expression to test - should throw
+	 *                   {@link IllegalArgumentException}
+	 */
+	@ParameterizedTest
+	@MethodSource
+	public void testEvaluateExpressionInvalid(String expression) {
+		final var database = new UnitDatabase();
+
+		database.addUnit("J", J);
+		database.addUnit("K", K);
+
+		database.addPrefix("A", A);
+		database.addPrefix("B", B);
+		database.addPrefix("C", C);
+
+		assertThrows(IllegalArgumentException.class,
+				() -> database.getUnitFromExpression(expression));
+		assertThrows(IllegalArgumentException.class,
+				() -> database.evaluateUnitExpression(expression));
+	}
+
 	/**
 	 * A test for the {@link UnitDatabase#evaluateUnitExpression(String)}
 	 * function. Simple because the expression parser has its own test.
-	 * 
+	 *
 	 * @since 2021-09-27
+	 * @since v0.3.2
 	 */
-	@Test
-	public void testEvaluateExpression() {
-		final UnitDatabase database = new UnitDatabase();
+	@ParameterizedTest
+	@MethodSource
+	public void testEvaluateExpressionValid(String expression,
+			LinearUnitValue expected) {
+		final var database = new UnitDatabase();
 
 		database.addUnit("J", J);
 		database.addUnit("K", K);
@@ -191,27 +260,30 @@ class UnitDatabaseTest {
 		database.addPrefix("B", B);
 		database.addPrefix("C", C);
 
-		final LinearUnitValue expected = LinearUnitValue.of(J,
-				UncertainDouble.of(12, Math.sqrt(14.625)));
-		// note: units are exact, each number has an uncertainty of 1
-		final LinearUnitValue actual = database
-				.evaluateUnitExpression("J + (2 * 3) J + (20 / 4) J");
+		final var actual = database.evaluateUnitExpression(expression);
 		assertEquals(expected, actual);
 
-		// check that negation works properly
-		assertEquals(2,
-				database.evaluateUnitExpression("J - -1 * J").getValueExact());
+		final var expectedU = expected.getUnit().times(expected.getValueExact());
+		final var actualU = database.getUnitFromExpression(expression);
+		assertEquals(expectedU, actualU);
+	}
+
+	@ParameterizedTest
+	@MethodSource
+	public void testFormatExpression(String expression, String expected) {
+		assertEquals(expected, UnitDatabase.formatExpression(expression));
 	}
 
 	/**
 	 * Test for {@link UnitDatabase#getUnit}, {@link UnitDatabase#getLinearUnit}
 	 * and {@link UnitDatabase#getLinearUnitValue}.
-	 * 
+	 *
 	 * @since 2021-10-07
+	 * @since v0.3.2
 	 */
 	@Test
 	public void testGetUnit() {
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 
 		database.addUnit("m", Metric.METRE);
 		database.addUnit("meter", Metric.METRE);
@@ -239,14 +311,15 @@ class UnitDatabaseTest {
 	/**
 	 * Confirms that operations that shouldn't function for infinite databases
 	 * throw an {@code IllegalStateException}.
-	 * 
+	 *
 	 * @since 2019-05-03
+	 * @since v0.3.0
 	 */
 //	@Test
 //	@Timeout(value = 1, unit = TimeUnit.SECONDS)
 	public void testInfiniteSetExceptions() {
 		// load units
-		final UnitDatabase infiniteDatabase = new UnitDatabase();
+		final var infiniteDatabase = new UnitDatabase();
 
 		infiniteDatabase.addUnit("J", J);
 		infiniteDatabase.addUnit("K", K);
@@ -255,9 +328,8 @@ class UnitDatabaseTest {
 		infiniteDatabase.addPrefix("B", B);
 		infiniteDatabase.addPrefix("C", C);
 
-		final Set<Entry<String, Unit>> entrySet = infiniteDatabase.unitMap()
-				.entrySet();
-		final Set<String> keySet = infiniteDatabase.unitMap().keySet();
+		final var entrySet = infiniteDatabase.unitMap().entrySet();
+		final var keySet = infiniteDatabase.unitMap().keySet();
 		assertThrows(IllegalStateException.class, () -> entrySet.toArray());
 		assertThrows(IllegalStateException.class, () -> keySet.toArray());
 	}
@@ -267,18 +339,20 @@ class UnitDatabaseTest {
 	 *
 	 * @param num which file to test
 	 * @since 2021-10-04
+	 * @since v0.3.2
 	 */
 	@ParameterizedTest
 	@ValueSource(ints = { 1, 2, 3 })
 	public void testLoadingInvalidDimensionFile(int num) {
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 		database.addDimension("LENGTH", Metric.Dimensions.LENGTH);
 		database.addDimension("MASS", Metric.Dimensions.MASS);
 		database.addDimension("TIME", Metric.Dimensions.TIME);
-		final String filename = String.format("/test-dimensionfile-invalid%d.txt",
+		final var filename = String.format("/test-dimensionfile-invalid%d.txt",
 				num);
-		final RuntimeException e = assertThrows(RuntimeException.class,
-				() -> loadDimensionFile(database, filename));
+		final var errs = loadDimensionFile(database, filename);
+		assertFalse(errs.isEmpty(), "no error from invalid file " + filename);
+		final var e = errs.get(0).problem();
 		assertTrue(e instanceof IllegalArgumentException
 				|| e instanceof NoSuchElementException);
 	}
@@ -288,27 +362,29 @@ class UnitDatabaseTest {
 	 *
 	 * @param num which file to test
 	 * @since 2021-09-27
+	 * @since v0.3.2
 	 */
 	@ParameterizedTest
 	@ValueSource(ints = { 1, 2, 3, 4, 5 })
 	public void testLoadingInvalidUnitFile(int num) {
-		final UnitDatabase database = new UnitDatabase();
-		final String filename = String.format("/test-unitsfile-invalid%d.txt",
-				num);
-		final RuntimeException e = assertThrows(RuntimeException.class,
-				() -> loadUnitsFile(database, filename));
+		final var database = new UnitDatabase();
+		final var filename = String.format("/test-unitsfile-invalid%d.txt", num);
+		final var errs = loadUnitsFile(database, filename);
+		assertFalse(errs.isEmpty(), "no error from invalid file " + filename);
+		final var e = errs.get(0).problem();
 		assertTrue(e instanceof IllegalArgumentException
 				|| e instanceof NoSuchElementException);
 	}
 
 	/**
 	 * Tests loading a valid dimension-file with some derived dimensions.
-	 * 
+	 *
 	 * @since 2021-10-04
+	 * @since v0.3.2
 	 */
 	@Test
 	public void testLoadingValidDimensions() {
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 		database.addDimension("LENGTH", Metric.Dimensions.LENGTH);
 		database.addDimension("MASS", Metric.Dimensions.MASS);
 		database.addDimension("TIME", Metric.Dimensions.TIME);
@@ -321,27 +397,33 @@ class UnitDatabaseTest {
 
 	/**
 	 * Tests loading a valid unitfile with some prefixes and no units.
-	 * 
+	 *
 	 * @since 2021-09-22
+	 * @since v0.3.2
 	 */
 	@Test
 	public void testLoadingValidPrefixes() {
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 
 		loadUnitsFile(database, "/test-unitsfile-valid2.txt");
 		assertEquals(7, database.getPrefix("A").getMultiplier());
 		assertEquals(11, database.getPrefix("B").getMultiplier());
 		assertEquals(13, database.getPrefix("C").getMultiplier());
+
+		// test invalid prefixes
+		assertThrows(NoSuchElementException.class,
+				() -> database.getPrefix("N/A"));
 	}
 
 	/**
 	 * Tests loading a valid unitfile with some units and preloaded prefixes
-	 * 
+	 *
 	 * @since 2021-09-22
+	 * @since v0.3.2
 	 */
 	@Test
 	public void testLoadingValidUnits() {
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 
 		database.addUnit("U", U);
 		database.addUnit("V", V);
@@ -357,21 +439,21 @@ class UnitDatabaseTest {
 
 		final Unit expected1 = ((LinearUnit) U).withPrefix(A).withPrefix(B)
 				.withPrefix(C);
-		final Unit actual1 = database.getUnit("test1");
+		final var actual1 = database.getUnit("test1");
 		assertEquals(expected1, actual1);
 
 		final Unit expected2 = ((LinearUnit) W).withPrefix(B)
 				.times(((LinearUnit) V).withPrefix(C));
-		final Unit actual2 = database.getUnit("test2");
+		final var actual2 = database.getUnit("test2");
 		assertEquals(expected2, actual2);
 
 		final Unit expected3 = ((LinearUnit) U)
 				.times(A.getMultiplier() + C.getMultiplier() - B.getMultiplier());
-		final Unit actual3 = database.getUnit("test3");
+		final var actual3 = database.getUnit("test3");
 		assertEquals(expected3, actual3);
 
-		final UnitValue expected4 = UnitValue.of(U, 1);
-		final UnitValue actual4 = database
+		final var expected4 = UnitValue.of(U, 1);
+		final var actual4 = database
 				.evaluateUnitExpression("-5 * U + -3 * U + 12 * U - 3 * U")
 				.asUnitValue();
 		assertEquals(expected4, actual4);
@@ -382,21 +464,21 @@ class UnitDatabaseTest {
 	/**
 	 * Tests the iterator of the prefixless unit map. These tests are simple, as
 	 * the unit map iterator is simple.
-	 * 
+	 *
 	 * @since 2021-10-07
+	 * @since v0.3.2
 	 */
 	@Test
 	public void testPrefixedUnitMapIterator() {
-		final UnitDatabase database1 = new UnitDatabase();
+		final var database1 = new UnitDatabase();
 
 		database1.addUnit("U", U);
 		database1.addUnit("V", V);
 		database1.addUnit("W", W);
 
-		final Map<String, Unit> map1 = database1.unitMap();
-		final Iterator<String> keyIterator1 = map1.keySet().iterator();
-		final Iterator<Map.Entry<String, Unit>> entryIterator1 = map1.entrySet()
-				.iterator();
+		final var map1 = database1.unitMap();
+		final var keyIterator1 = map1.keySet().iterator();
+		final var entryIterator1 = map1.entrySet().iterator();
 
 		final Set<String> expectedKeys = Set.of("U", "V", "W");
 		final Set<String> actualKeys = new HashSet<>();
@@ -418,13 +500,13 @@ class UnitDatabaseTest {
 
 	/**
 	 * Test that prefixes correctly apply to units.
-	 * 
+	 *
 	 * @since 2019-04-14
 	 * @since v0.2.0
 	 */
 	@Test
 	public void testPrefixes() {
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 
 		database.addUnit("U", U);
 		database.addUnit("V", V);
@@ -439,29 +521,28 @@ class UnitDatabaseTest {
 		assertEquals(expected, database.getPrefixesFromName("ABCU"));
 
 		// get the product
-		final Unit abcuNonlinear = database.getUnit("ABCU");
+		final var abcuNonlinear = database.getUnit("ABCU");
 		assert abcuNonlinear instanceof LinearUnit;
 
-		final LinearUnit abcu = (LinearUnit) abcuNonlinear;
+		final var abcu = (LinearUnit) abcuNonlinear;
 		assertEquals(A.getMultiplier() * B.getMultiplier() * C.getMultiplier(),
 				abcu.getConversionFactor(), 1e-15);
 	}
 
 	/**
 	 * Tests the functionnalites of the prefixless unit map.
-	 * 
+	 *
 	 * <p>
 	 * The map should be an auto-updating view of the units in the database.
 	 * </p>
-	 * 
+	 *
 	 * @since 2019-04-14
 	 * @since v0.2.0
 	 */
 	@Test
 	public void testPrefixlessUnitMap() {
-		final UnitDatabase database = new UnitDatabase();
-		final Map<String, Unit> prefixlessUnits = database
-				.unitMapPrefixless(true);
+		final var database = new UnitDatabase();
+		final var prefixlessUnits = database.unitMapPrefixless(true);
 
 		database.addUnit("U", U);
 		database.addUnit("V", V);
@@ -478,13 +559,13 @@ class UnitDatabaseTest {
 	/**
 	 * Tests that the database correctly stores and retrieves units, ignoring
 	 * prefixes.
-	 * 
+	 *
 	 * @since 2019-04-14
 	 * @since v0.2.0
 	 */
 	@Test
 	public void testPrefixlessUnits() {
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 
 		database.addUnit("U", U);
 		database.addUnit("V", V);
@@ -517,7 +598,7 @@ class UnitDatabaseTest {
 
 	@Test
 	public void testToString() {
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 
 		database.addUnit("J", J);
 		database.addUnit("K", J);
@@ -538,14 +619,14 @@ class UnitDatabaseTest {
 
 	/**
 	 * Test that unit expressions return the correct value.
-	 * 
+	 *
 	 * @since 2019-04-14
 	 * @since v0.2.0
 	 */
 	@Test
 	public void testUnitExpressions() {
 		// load units
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 
 		database.addUnit("U", U);
 		database.addUnit("V", V);
@@ -560,13 +641,13 @@ class UnitDatabaseTest {
 		// first test - test prefixes and operations
 		final Unit expected1 = J.withPrefix(A).withPrefix(B).withPrefix(C)
 				.withPrefix(C);
-		final Unit actual1 = database.getUnitFromExpression("ABV * CU^2 / W / W");
+		final var actual1 = database.getUnitFromExpression("ABV * CU^2 / W / W");
 
 		assertEquals(expected1, actual1);
 
 		// second test - test addition and subtraction
 		final Unit expected2 = J.times(58);
-		final Unit actual2 = database.getUnitFromExpression("2 fj + 6 ej");
+		final var actual2 = database.getUnitFromExpression("2 fj + 6 ej");
 
 		assertEquals(expected2, actual2);
 
@@ -579,14 +660,14 @@ class UnitDatabaseTest {
 
 	/**
 	 * Tests both the unit name iterator and the name-unit entry iterator
-	 * 
+	 *
 	 * @since 2019-04-14
 	 * @since v0.2.0
 	 */
 	@Test
 	public void testUnitIterator() {
 		// load units
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 
 		database.addUnit("J", J);
 		database.addUnit("K", K);
@@ -595,19 +676,17 @@ class UnitDatabaseTest {
 		database.addPrefix("B", B);
 		database.addPrefix("C", C);
 
-		final int NUM_UNITS = database.unitMapPrefixless(true).size();
-		final int NUM_PREFIXES = database.prefixMap(true).size();
+		final var NUM_UNITS = database.unitMapPrefixless(true).size();
+		final var NUM_PREFIXES = database.prefixMap(true).size();
 
-		final Iterator<String> nameIterator = database.unitMap().keySet()
-				.iterator();
-		final Iterator<Entry<String, Unit>> entryIterator = database.unitMap()
-				.entrySet().iterator();
+		final var nameIterator = database.unitMap().keySet().iterator();
+		final var entryIterator = database.unitMap().entrySet().iterator();
 
-		int expectedLength = 1;
-		int unitsWithThisLengthSoFar = 0;
+		var expectedLength = 1;
+		var unitsWithThisLengthSoFar = 0;
 
 		// loop 1000 times
-		for (int i = 0; i < 1000; i++) {
+		for (var i = 0; i < 1000; i++) {
 			// expected length of next
 			if (unitsWithThisLengthSoFar >= NUM_UNITS
 					* (int) Math.pow(NUM_PREFIXES, expectedLength - 1)) {
@@ -616,9 +695,9 @@ class UnitDatabaseTest {
 			}
 
 			// test that stuff is valid
-			final String nextName = nameIterator.next();
-			final Unit nextUnit = database.getUnit(nextName);
-			final Entry<String, Unit> nextEntry = entryIterator.next();
+			final var nextName = nameIterator.next();
+			final var nextUnit = database.getUnit(nextName);
+			final var nextEntry = entryIterator.next();
 
 			assertEquals(expectedLength, nextName.length());
 			assertEquals(nextName, nextEntry.getKey());
@@ -628,13 +707,13 @@ class UnitDatabaseTest {
 		}
 
 		// test toString for consistency
-		final String entryIteratorString = entryIterator.toString();
-		for (int i = 0; i < 3; i++) {
+		final var entryIteratorString = entryIterator.toString();
+		for (var i = 0; i < 3; i++) {
 			assertEquals(entryIteratorString, entryIterator.toString());
 		}
 
-		final String nameIteratorString = nameIterator.toString();
-		for (int i = 0; i < 3; i++) {
+		final var nameIteratorString = nameIterator.toString();
+		for (var i = 0; i < 3; i++) {
 			assertEquals(nameIteratorString, nameIterator.toString());
 		}
 	}
@@ -646,14 +725,14 @@ class UnitDatabaseTest {
 	 * For example, "ABCU" could mean "A-B-C-U", "AB-C-U", or "A-BC-U". In this
 	 * case, "AB-C-U" is the correct choice.
 	 * </p>
-	 * 
+	 *
 	 * @since 2019-04-14
 	 * @since v0.2.0
 	 */
 	@Test
 	public void testUnitPrefixCombinations() {
 		// load units
-		final UnitDatabase database = new UnitDatabase();
+		final var database = new UnitDatabase();
 
 		database.addUnit("J", J);
 
@@ -665,7 +744,7 @@ class UnitDatabaseTest {
 
 		// test 1 - AB-C-J vs A-BC-J vs A-B-C-J
 		final Unit expected1 = J.withPrefix(AB).withPrefix(C);
-		final Unit actual1 = database.getUnit("ABCJ");
+		final var actual1 = database.getUnit("ABCJ");
 
 		assertEquals(expected1, actual1);
 
@@ -674,8 +753,61 @@ class UnitDatabaseTest {
 		database.addPrefix("ABC", UnitPrefix.valueOf(17));
 
 		final Unit expected2 = J.times(17);
-		final Unit actual2 = database.getUnit("ABCJ");
+		final var actual2 = database.getUnit("ABCJ");
 
 		assertEquals(expected2, actual2);
 	}
+
+	/**
+	 * Tests the ability to create, read, and delete unit sets.
+	 *
+	 * @since 2025-04-30
+	 * @since v1.0.0
+	 */
+	@Test
+	void testUnitSetsInvalid() {
+		final List<LinearUnit> units = List.of(Metric.SECOND,
+				BritishImperial.Length.INCH);
+
+		final var database = new UnitDatabase();
+
+		assertThrows(IllegalArgumentException.class,
+				() -> database.addUnitSet("badtest", units));
+		assertThrows(NoSuchElementException.class,
+				() -> database.getUnitSet("badtest"));
+
+		database.addUnit("ft", BritishImperial.Length.FOOT);
+		database.addUnit("s", Metric.SECOND);
+		database.addUnit("dC", Metric.CELSIUS);
+		database.addUnit("K", Metric.KELVIN);
+
+		assertThrows(IllegalArgumentException.class,
+				() -> database.getUnitSetFromExpression("K; dC"),
+				"getUnitSetFromExpression allowed nonlinear unit.");
+		assertThrows(IllegalArgumentException.class,
+				() -> database.getUnitSetFromExpression("ft; s"),
+				"getUnitSetFromExpression allowed units of different dimension.");
+	}
+
+	/**
+	 * Tests the ability to create, read, and delete unit sets.
+	 *
+	 * @since 2025-04-30
+	 * @since v1.0.0
+	 */
+	@Test
+	void testUnitSetsValid() {
+		final List<LinearUnit> units = List.of(BritishImperial.Length.FOOT,
+				BritishImperial.Length.INCH);
+
+		final var database = new UnitDatabase();
+
+		database.addUnitSet("ftintest", units);
+		assertEquals(units, database.getUnitSet("ftintest"));
+
+		database.addUnit("ft", BritishImperial.Length.FOOT);
+		database.addUnit("in", BritishImperial.Length.INCH);
+		assertEquals(units, database.getUnitSetFromExpression("ft; in"));
+	}
+
 }
diff --git a/src/test/java/sevenUnits/unit/UnitTest.java b/src/test/java/sevenUnits/unit/UnitTest.java
index c93043b..fb21723 100644
--- a/src/test/java/sevenUnits/unit/UnitTest.java
+++ b/src/test/java/sevenUnits/unit/UnitTest.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2018 Adrien Hopkins
+ * Copyright (C) 2018, 2021, 2022, 2024, 2025 Adrien Hopkins
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -21,7 +21,6 @@ import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import java.math.RoundingMode;
 import java.util.Random;
 import java.util.concurrent.ThreadLocalRandom;
 
@@ -29,12 +28,11 @@ import org.junit.jupiter.api.Test;
 
 import sevenUnits.utils.DecimalComparison;
 import sevenUnits.utils.NameSymbol;
-import sevenUnits.utils.UncertainDouble;
 
 /**
  * Testing the various Unit classes. This is NOT part of this program's public
  * API.
- * 
+ *
  * @author Adrien Hopkins
  * @since 2018-12-22
  * @since v0.1.0
@@ -45,21 +43,25 @@ class UnitTest {
 
 	@Test
 	public void testAdditionAndSubtraction() {
-		final LinearUnit inch = Metric.METRE.times(0.0254)
+		final var inch = Metric.METRE.times(0.0254)
 				.withName(NameSymbol.of("inch", "in"));
-		final LinearUnit foot = Metric.METRE.times(0.3048)
+		final var foot = Metric.METRE.times(0.3048)
 				.withName(NameSymbol.of("foot", "ft"));
 
-		assertEquals(inch.plus(foot), Metric.METRE.times(0.3302));
-		assertEquals(foot.minus(inch), Metric.METRE.times(0.2794));
+		assertTrue(
+				inch.plus(foot).equalsApproximately(Metric.METRE.times(0.3302)),
+				String.format("Expected: %s, Actual: %s", inch.plus(foot),
+						Metric.METRE.times(0.3302)));
+		assertTrue(
+				foot.minus(inch).equalsApproximately(Metric.METRE.times(0.2794)),
+				String.format("Expected: %s, Actual: %s", foot.minus(inch),
+						Metric.METRE.times(0.2794)));
 
 		// test with LinearUnitValue
-		final LinearUnitValue value1 = LinearUnitValue.getExact(Metric.METRE, 15);
-		final LinearUnitValue value2 = LinearUnitValue.getExact(foot, 120);
-		final LinearUnitValue value3 = LinearUnitValue.getExact(Metric.METRE,
-				0.5);
-		final LinearUnitValue value4 = LinearUnitValue.getExact(Metric.KILOGRAM,
-				60);
+		final var value1 = LinearUnitValue.getExact(Metric.METRE, 15);
+		final var value2 = LinearUnitValue.getExact(foot, 120);
+		final var value3 = LinearUnitValue.getExact(Metric.METRE, 0.5);
+		final var value4 = LinearUnitValue.getExact(Metric.KILOGRAM, 60);
 
 		// make sure addition is done correctly
 		assertEquals(51.576, value1.plus(value2).getValueExact(), 0.001);
@@ -81,24 +83,24 @@ class UnitTest {
 
 	@Test
 	public void testConversion() {
-		final LinearUnit metre = Metric.METRE;
+		final var metre = Metric.METRE;
 		final Unit inch = metre.times(0.0254);
 
-		final UnitValue value = UnitValue.of(inch, 75);
+		final var value = UnitValue.of(inch, 75);
 
 		assertEquals(1.9, inch.convertTo(metre, 75), 0.01);
 		assertEquals(1.9, value.convertTo(metre).getValue(), 0.01);
 
 		// try random stuff
-		for (int i = 0; i < 1000; i++) {
+		for (var i = 0; i < 1000; i++) {
 			// initiate random values
-			final double conversionFactor = UnitTest.rng.nextDouble() * 1000000;
-			final double testValue = UnitTest.rng.nextDouble() * 1000000;
-			final double expected = testValue * conversionFactor;
+			final var conversionFactor = UnitTest.rng.nextDouble() * 1000000;
+			final var testValue = UnitTest.rng.nextDouble() * 1000000;
+			final var expected = testValue * conversionFactor;
 
 			// test
 			final Unit unit = Metric.METRE.times(conversionFactor);
-			final double actual = unit.convertToBase(testValue);
+			final var actual = unit.convertToBase(testValue);
 
 			assertEquals(actual, expected,
 					expected * DecimalComparison.DOUBLE_EPSILON);
@@ -107,7 +109,7 @@ class UnitTest {
 
 	@Test
 	public void testEquals() {
-		final LinearUnit metre = Metric.METRE;
+		final var metre = Metric.METRE;
 		final Unit meter = Metric.BaseUnits.METRE.asLinearUnit();
 
 		assertEquals(metre, meter);
@@ -127,19 +129,19 @@ class UnitTest {
 	@Test
 	public void testMultiplicationAndDivision() {
 		// test unit-times-unit multiplication
-		final LinearUnit generatedJoule = Metric.KILOGRAM
+		final var generatedJoule = Metric.KILOGRAM
 				.times(Metric.METRE.toExponent(2))
 				.dividedBy(Metric.SECOND.toExponent(2));
-		final LinearUnit actualJoule = Metric.JOULE;
+		final var actualJoule = Metric.JOULE;
 
 		assertEquals(generatedJoule, actualJoule);
 
 		// test multiplication by conversion factors
-		final LinearUnit kilometre = Metric.METRE.times(1000);
-		final LinearUnit hour = Metric.SECOND.times(3600);
-		final LinearUnit generatedKPH = kilometre.dividedBy(hour);
+		final var kilometre = Metric.METRE.times(1000);
+		final var hour = Metric.SECOND.times(3600);
+		final var generatedKPH = kilometre.dividedBy(hour);
 
-		final LinearUnit actualKPH = Metric.METRE.dividedBy(Metric.SECOND)
+		final var actualKPH = Metric.METRE.dividedBy(Metric.SECOND)
 				.dividedBy(3.6);
 
 		assertEquals(generatedKPH, actualKPH);
@@ -147,82 +149,9 @@ class UnitTest {
 
 	@Test
 	public void testPrefixes() {
-		final LinearUnit generatedKilometre = Metric.METRE
-				.withPrefix(Metric.KILO);
-		final LinearUnit actualKilometre = Metric.METRE.times(1000);
+		final var generatedKilometre = Metric.METRE.withPrefix(Metric.KILO);
+		final var actualKilometre = Metric.METRE.times(1000);
 
 		assertEquals(generatedKilometre, actualKilometre);
 	}
-
-	/**
-	 * Tests converting an uncertain LinearUnitValue to a string.
-	 * 
-	 * @since 2021-11-04
-	 */
-	@Test
-	public void testValueToString1() {
-		final LinearUnitValue value = LinearUnitValue.of(Metric.METRE,
-				UncertainDouble.of(10, 0.24));
-
-		assertEquals("(10.0 � 0.2) m", value.toString());
-		assertEquals("(10.0 � 0.2) m",
-				value.toString(true, RoundingMode.HALF_EVEN));
-		assertEquals("10.0 m", value.toString(false, RoundingMode.HALF_EVEN));
-	}
-
-	/**
-	 * Tests converting a certain LinearUnitValue to a string.
-	 * 
-	 * @since 2021-11-04
-	 */
-	@Test
-	public void testValueToString2() {
-		final LinearUnitValue value = LinearUnitValue.of(Metric.METRE,
-				UncertainDouble.of(10, 0));
-
-		assertEquals("10.0 m", value.toString());
-		assertEquals("(10.0 � 0.0) m",
-				value.toString(true, RoundingMode.HALF_EVEN));
-		assertEquals("10.0 m", value.toString(false, RoundingMode.HALF_EVEN));
-	}
-
-	/**
-	 * Tests converting an unnamed LinearUnitValue to a string.
-	 * 
-	 * @since 2021-11-04
-	 */
-	@Test
-	public void testValueToString3() {
-		final LinearUnitValue value = LinearUnitValue.of(
-				Metric.METRE.withName(NameSymbol.EMPTY),
-				UncertainDouble.of(10, 0.24));
-
-		assertEquals("10.0 unnamed unit (= 10.0 m)",
-				value.toString(false, RoundingMode.HALF_EVEN));
-	}
-
-	/**
-	 * Tests converting a named UnitValue to a string.
-	 * 
-	 * @since 2021-11-04
-	 */
-	@Test
-	public void testValueToString4() {
-		final UnitValue value = UnitValue.of(BritishImperial.FAHRENHEIT, 80);
-
-		assertEquals("80.0 \u00B0F", value.toString());
-	}
-
-	/**
-	 * Tests converting an unnamed UnitValue to a string.
-	 * 
-	 * @since 2021-11-04
-	 */
-	@Test
-	public void testValueToString5() {
-		final UnitValue value = UnitValue
-				.of(USCustomary.FAHRENHEIT.withName(NameSymbol.EMPTY), 50);
-
-		assertEquals("50.0 unnamed unit (= 283.15 K)", value.toString());
-	}
 }
diff --git a/src/test/java/sevenUnits/unit/UnitValueTest.java b/src/test/java/sevenUnits/unit/UnitValueTest.java
new file mode 100644
index 0000000..3679703
--- /dev/null
+++ b/src/test/java/sevenUnits/unit/UnitValueTest.java
@@ -0,0 +1,240 @@
+/**
+ * Copyright (C) 2021, 2025 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package sevenUnits.unit;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.math.RoundingMode;
+import java.util.List;
+import java.util.Objects;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import sevenUnits.utils.NameSymbol;
+import sevenUnits.utils.UncertainDouble;
+
+/**
+ * Tests for the UnitValue and LinearUnitValue classes
+ *
+ * @since v1.0.0
+ */
+public final class UnitValueTest {
+	private static Stream<Arguments> testConvertToMultiple() {
+		return Stream.of(
+				Arguments.of(
+						LinearUnitValue.getExact(BritishImperial.Length.INCH, 64),
+						List.of(BritishImperial.Length.FOOT,
+								BritishImperial.Length.INCH),
+						List.of(5.0, 4.0)),
+				Arguments.of(LinearUnitValue.getExact(Metric.SECOND, 44102.5),
+						List.of(Metric.HOUR, Metric.MINUTE, Metric.SECOND),
+						List.of(12.0, 15.0, 2.5)));
+	}
+
+	@ParameterizedTest
+	@MethodSource
+	public void testConvertToMultiple(LinearUnitValue valFrom,
+			List<LinearUnit> others, List<Double> expectedValues) {
+		final var actual = valFrom.convertToMultiple(others);
+		assertEquals(others.size(), expectedValues.size(), String.format(
+				"%s converted to %s had the wrong number of resulting units (expected: %d, actual: %d).",
+				valFrom, others, others.size(), actual.size()));
+
+		for (var i = 0; i < others.size(); i++) {
+			final var expectedValue = LinearUnitValue.getExact(others.get(i),
+					expectedValues.get(i));
+			assertTrue(expectedValue.equivalent(actual.get(i)),
+					String.format("Value %d: expected %s, actual %s.", i,
+							expectedValue, actual.get(i)));
+		}
+	}
+
+	@Test
+	public void testConvertToMultipleErrors() {
+		assertThrows(IllegalArgumentException.class,
+				() -> LinearUnitValue.ONE.convertToMultiple(List.of()));
+		assertThrows(IllegalArgumentException.class,
+				() -> LinearUnitValue.ONE.convertToMultiple(List.of(Metric.METRE)));
+	}
+
+	// I am intentionally testing whether or not equals gracefully returns false
+	// when it gets an argument of the wrong type
+	@SuppressWarnings("unlikely-arg-type")
+	@Test
+	public void testEqualsHashCode() {
+		final var v1 = LinearUnitValue.of(Metric.METRE,
+				UncertainDouble.of(1.0, 0.01));
+		final var v2 = LinearUnitValue.of(Metric.METRE,
+				UncertainDouble.of(1.0, 0.01));
+		final var v3 = LinearUnitValue.of(Metric.MILLIMETRE,
+				UncertainDouble.of(1000.0, 10.0));
+		final var v4 = LinearUnitValue.of(Metric.MILLIMETRE,
+				UncertainDouble.of(1000.0, 20.0));
+
+		assertTrue(Objects.equals(v1, v2),
+				"Two identical values are not equal()");
+		assertTrue(Objects.equals(v1.hashCode(), v2.hashCode()),
+				"Two identical values have different hash codes.");
+		assertTrue(Objects.equals(v1, v3),
+				"Two values with the same value but different units are not equal()");
+		assertTrue(Objects.equals(v1.hashCode(), v3.hashCode()),
+				"Two values with the same value but different units have different hash codes.");
+		assertFalse(Objects.equals(v1, v4),
+				"Two values with the same value but different uncertainties are equal()");
+		assertFalse(Objects.equals(v1, "Hello"));
+		assertFalse(v1.equals("Hello", true));
+	}
+
+	@Test
+	public void testEqualsNoFP() {
+		final var v1 = LinearUnitValue.of(Metric.METRE,
+				UncertainDouble.of(1.0, 0.01));
+		final var v2 = LinearUnitValue.of(Metric.METRE,
+				UncertainDouble.of(1.0, 0.01));
+		final var v3 = LinearUnitValue.of(Metric.METRE,
+				UncertainDouble.of(1.0 + 5e-16, 0.01));
+		assertTrue(v1.equals(v2, false));
+		assertFalse(v1.equals(v3, false));
+		assertTrue(v1.equals(v3, true));
+	}
+
+	@Test
+	public void testOperations() {
+		final var v1 = LinearUnitValue.getExact(Metric.METRE, 2.0);
+		final var v2 = LinearUnitValue.getExact(Metric.METRE, 4.0);
+
+		assertEquals(v2, v1.times(2));
+		assertEquals(v1, v2.dividedBy(2));
+		assertEquals(LinearUnitValue.getExact(Metric.SQUARE_METRE, 8.0),
+				v1.times(v2));
+		assertEquals(LinearUnitValue.getExact(Metric.ONE, 0.5), v1.dividedBy(v2));
+		assertEquals(LinearUnitValue.getExact(Metric.SQUARE_METRE, 4.0),
+				v1.toExponent(2));
+		assertEquals(LinearUnitValue.getExact(Metric.SQUARE_METRE, 4.0),
+				v1.toExponentRounded(2.0));
+	}
+
+	@Test
+	public void testValueEquivalent() {
+		final var v1 = LinearUnitValue.of(BritishImperial.Length.INCH,
+				UncertainDouble.of(1.0, 0.0));
+		final var v2 = LinearUnitValue.of(Metric.METRE,
+				UncertainDouble.of(0.0255, 0.0));
+		assertFalse(v1.equivalent(v2));
+
+		final var v3 = LinearUnitValue.of(BritishImperial.Length.INCH,
+				UncertainDouble.of(1.0, 1.0));
+		final var v4 = LinearUnitValue.of(Metric.METRE,
+				UncertainDouble.of(0.0255, 0.025));
+		assertTrue(v3.equivalent(v4));
+	}
+
+	@Test
+	public void testValueEquivalentErrors() {
+		final var v1 = LinearUnitValue.of(BritishImperial.Length.INCH,
+				UncertainDouble.of(1.0, 0.0));
+		final var v2 = LinearUnitValue.of(BritishImperial.CALORIE,
+				UncertainDouble.of(1.0, 0.0));
+		assertFalse(v1.equivalent(v2));
+
+		assertFalse(v1.equivalent(null));
+	}
+
+	/**
+	 * Tests converting an uncertain LinearUnitValue to a string.
+	 *
+	 * @since 2021-11-04
+	 * @since v0.3.2
+	 */
+	@Test
+	public void testValueToString1() {
+		final var value = LinearUnitValue.of(Metric.METRE,
+				UncertainDouble.of(10, 0.24));
+
+		assertEquals("(10.0 ± 0.2) m", value.toString());
+		assertEquals("(10.0 ± 0.2) m",
+				value.toString(true, RoundingMode.HALF_EVEN));
+		assertEquals("10.0 m", value.toString(false, RoundingMode.HALF_EVEN));
+	}
+
+	/**
+	 * Tests converting a certain LinearUnitValue to a string.
+	 *
+	 * @since 2021-11-04
+	 * @since v0.3.2
+	 */
+	@Test
+	public void testValueToString2() {
+		final var value = LinearUnitValue.of(Metric.METRE,
+				UncertainDouble.of(10, 0));
+
+		assertEquals("10.0 m", value.toString());
+		assertEquals("(10.0 ± 0.0) m",
+				value.toString(true, RoundingMode.HALF_EVEN));
+		assertEquals("10.0 m", value.toString(false, RoundingMode.HALF_EVEN));
+	}
+
+	/**
+	 * Tests converting an unnamed LinearUnitValue to a string.
+	 *
+	 * @since 2021-11-04
+	 * @since v0.3.2
+	 */
+	@Test
+	public void testValueToString3() {
+		final var value = LinearUnitValue.of(
+				Metric.METRE.withName(NameSymbol.EMPTY),
+				UncertainDouble.of(10, 0.24));
+
+		assertEquals("10.0 unnamed unit (= 10.0 m)",
+				value.toString(false, RoundingMode.HALF_EVEN));
+	}
+
+	/**
+	 * Tests converting a named UnitValue to a string.
+	 *
+	 * @since 2021-11-04
+	 * @since v0.3.2
+	 */
+	@Test
+	public void testValueToString4() {
+		final var value = UnitValue.of(BritishImperial.FAHRENHEIT, 80);
+
+		assertEquals("80.0 \u00B0F", value.toString());
+	}
+
+	/**
+	 * Tests converting an unnamed UnitValue to a string.
+	 *
+	 * @since 2021-11-04
+	 * @since v0.3.2
+	 */
+	@Test
+	public void testValueToString5() {
+		final var value = UnitValue
+				.of(USCustomary.FAHRENHEIT.withName(NameSymbol.EMPTY), 50);
+
+		assertEquals("50.0 unnamed unit (= 283.15 K)", value.toString());
+	}
+}