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diff --git a/src/test/java/sevenUnitsGUI/PrefixSearchTest.java b/src/test/java/sevenUnitsGUI/PrefixSearchTest.java
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+/**
+ * Copyright (C) 2022 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 sevenUnitsGUI;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static sevenUnitsGUI.PrefixSearchRule.COMMON_PREFIXES;
+import static sevenUnitsGUI.PrefixSearchRule.NO_PREFIXES;
+import static sevenUnitsGUI.PrefixSearchRule.getCoherentOnlyRule;
+import static sevenUnitsGUI.PrefixSearchRule.getUniversalRule;
+
+import java.util.Map;
+import java.util.Set;
+
+import org.junit.jupiter.api.Test;
+
+import sevenUnits.unit.BritishImperial;
+import sevenUnits.unit.LinearUnit;
+import sevenUnits.unit.Metric;
+
+/**
+ * Tests for {@link PrefixSearchRule}
+ *
+ * @since v0.4.0
+ * @since 2022-07-17
+ */
+class PrefixSearchTest {
+	/**
+	 * A method that creates duplicate copies of the common prefix rule.
+	 */
+	private static final PrefixSearchRule getCommonRuleCopy() {
+		return getCoherentOnlyRule(Set.of(Metric.KILO, Metric.MILLI));
+	}
+	
+	/**
+	 * Test method for
+	 * {@link sevenUnitsGUI.PrefixSearchRule#apply(java.util.Map.Entry)}, for a
+	 * coherent unit and {@link PrefixSearchRule#COMMON_PREFIXES}.
+	 *
+	 * @since v0.4.0
+	 * @since 2022-07-17
+	 */
+	@Test
+	final void testCoherentPrefixSearch() {
+		final var expected = Map.of("metre", Metric.METRE, "kilometre",
+				Metric.KILOMETRE, "millimetre", Metric.MILLIMETRE);
+		final var actual = COMMON_PREFIXES
+				.apply(Map.entry("metre", Metric.METRE));
+		
+		assertEquals(expected, actual,
+				"Prefixes not correctly applied to coherent unit.");
+	}
+	
+	/**
+	 * Test method for
+	 * {@link sevenUnitsGUI.PrefixSearchRule#equals(java.lang.Object)}.
+	 *
+	 * @since v0.4.0
+	 * @since 2022-07-17
+	 */
+	@Test
+	final void testEquals() {
+		assertEquals(getCommonRuleCopy(), getCommonRuleCopy(),
+				"equals considers something other than prefixes/rule");
+		
+		assertNotEquals(getCoherentOnlyRule(Set.of()), getUniversalRule(Set.of()),
+				"equals ignores rule");
+	}
+	
+	/**
+	 * Test method for {@link sevenUnitsGUI.PrefixSearchRule#getPrefixes()}.
+	 *
+	 * @since v0.4.0
+	 * @since 2022-07-17
+	 */
+	@Test
+	final void testGetPrefixes() {
+		assertEquals(Set.of(), NO_PREFIXES.getPrefixes());
+		assertEquals(Metric.ALL_PREFIXES,
+				PrefixSearchRule.ALL_METRIC_PREFIXES.getPrefixes());
+	}
+	
+	/**
+	 * Test method for {@link sevenUnitsGUI.PrefixSearchRule#hashCode()}.
+	 *
+	 * @since v0.4.0
+	 * @since 2022-07-17
+	 */
+	@Test
+	final void testHashCode() {
+		assertEquals(getCommonRuleCopy().hashCode(),
+				getCommonRuleCopy().hashCode());
+	}
+	
+	/**
+	 * Tests prefix searching for a non-coherent unit and
+	 * {@link PrefixSearchRule#COMMON_PREFIXES}.
+	 * 
+	 * @since v0.4.0
+	 * @since 2022-07-17
+	 */
+	@Test
+	final void testNonCoherentPrefixSearch() {
+		final var input = Map.entry("inch", BritishImperial.Length.INCH);
+		final var expected = Map.ofEntries(input);
+		final var actual = COMMON_PREFIXES.apply(input);
+		
+		assertEquals(expected, actual, "Prefixes applied to non-coherent unit.");
+	}
+	
+	/**
+	 * Tests that {@link PrefixSearchRule#NO_PREFIXES} returns the original unit.
+	 * 
+	 * @since v0.4.0
+	 * @since 2022-07-17
+	 */
+	@Test
+	void testNoPrefixes() {
+		for (final String name : Set.of("name1", "hello", "there")) {
+			for (final LinearUnit unit : Set.of(Metric.METRE, Metric.KILOMETRE,
+					BritishImperial.Length.INCH)) {
+				final var testEntry = Map.entry(name, unit);
+				final var expected = Map.ofEntries(testEntry);
+				final var actual = NO_PREFIXES.apply(testEntry);
+				assertEquals(expected, actual, () -> String
+						.format("NO_PREFIXES.apply(%s) != %s", testEntry, actual));
+			}
+		}
+	}
+	
+	/**
+	 * Test method for {@link sevenUnitsGUI.PrefixSearchRule#toString()}.
+	 *
+	 * @since v0.4.0
+	 * @since 2022-07-17
+	 */
+	@Test
+	final void testToString() {
+		assertEquals(
+				"Apply the following prefixes: [kilo (\u00D7 1000.0), milli (\u00D7 0.001)]",
+				COMMON_PREFIXES.toString());
+	}
+	
+}