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diff --git a/src/org/unitConverter/math/ConditionalExistenceCollectionsTest.java b/src/org/unitConverter/math/ConditionalExistenceCollectionsTest.java
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+/**
+ * Copyright (C) 2019 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 org.unitConverter.math;
+
+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.util.Arrays;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.NoSuchElementException;
+
+import org.junit.jupiter.api.Test;
+import org.unitConverter.math.ConditionalExistenceCollections.ConditionalExistenceIterator;
+
+/**
+ * Tests the {@link #ConditionalExistenceCollections}.
+ * 
+ * @author Adrien Hopkins
+ * @since 2019-10-16
+ */
+class ConditionalExistenceCollectionsTest {
+
+	/**
+	 * The returned iterator ignores elements that don't start with "a".
+	 * 
+	 * @return test iterator
+	 * @since 2019-10-17
+	 */
+	ConditionalExistenceIterator<String> getTestIterator() {
+		final List<String> items = Arrays.asList("aa", "ab", "ba");
+		final Iterator<String> it = items.iterator();
+		final ConditionalExistenceIterator<String> cit = (ConditionalExistenceIterator<String>) ConditionalExistenceCollections
+				.conditionalExistenceIterator(it, s -> s.startsWith("a"));
+		return cit;
+	}
+
+	/**
+	 * The returned map ignores mappings where the value is zero.
+	 * 
+	 * @return map to be used for test data
+	 * @since 2019-10-16
+	 */
+	Map<String, Integer> getTestMap() {
+		final Map<String, Integer> map = new HashMap<>();
+		map.put("one", 1);
+		map.put("two", 2);
+		map.put("zero", 0);
+		map.put("ten", 10);
+		final Map<String, Integer> conditionalMap = ConditionalExistenceCollections.conditionalExistenceMap(map,
+				e -> !Integer.valueOf(0).equals(e.getValue()));
+		return conditionalMap;
+	}
+
+	/**
+	 * Test method for {@link org.unitConverter.math.ZeroIsNullMap#containsKey(java.lang.Object)}.
+	 */
+	@Test
+	void testContainsKeyObject() {
+		final Map<String, Integer> map = this.getTestMap();
+		assertTrue(map.containsKey("one"));
+		assertTrue(map.containsKey("ten"));
+		assertFalse(map.containsKey("five"));
+		assertFalse(map.containsKey("zero"));
+	}
+
+	/**
+	 * Test method for {@link org.unitConverter.math.ZeroIsNullMap#containsValue(java.lang.Object)}.
+	 */
+	@Test
+	void testContainsValueObject() {
+		final Map<String, Integer> map = this.getTestMap();
+		assertTrue(map.containsValue(1));
+		assertTrue(map.containsValue(10));
+		assertFalse(map.containsValue(5));
+		assertFalse(map.containsValue(0));
+	}
+
+	/**
+	 * Test method for {@link org.unitConverter.math.ZeroIsNullMap#entrySet()}.
+	 */
+	@Test
+	void testEntrySet() {
+		final Map<String, Integer> map = this.getTestMap();
+		for (final Entry<String, Integer> e : map.entrySet()) {
+			assertTrue(e.getValue() != 0);
+		}
+	}
+
+	/**
+	 * Test method for {@link org.unitConverter.math.ZeroIsNullMap#get(java.lang.Object)}.
+	 */
+	@Test
+	void testGetObject() {
+		final Map<String, Integer> map = this.getTestMap();
+		assertEquals(1, map.get("one"));
+		assertEquals(10, map.get("ten"));
+		assertEquals(null, map.get("five"));
+		assertEquals(null, map.get("zero"));
+	}
+
+	@Test
+	void testIterator() {
+		final ConditionalExistenceIterator<String> testIterator = this.getTestIterator();
+
+		assertTrue(testIterator.hasNext);
+		assertTrue(testIterator.hasNext());
+		assertEquals("aa", testIterator.nextElement);
+		assertEquals("aa", testIterator.next());
+
+		assertTrue(testIterator.hasNext);
+		assertTrue(testIterator.hasNext());
+		assertEquals("ab", testIterator.nextElement);
+		assertEquals("ab", testIterator.next());
+
+		assertFalse(testIterator.hasNext);
+		assertFalse(testIterator.hasNext());
+		assertEquals(null, testIterator.nextElement);
+		assertThrows(NoSuchElementException.class, testIterator::next);
+	}
+
+	/**
+	 * Test method for {@link org.unitConverter.math.ZeroIsNullMap#keySet()}.
+	 */
+	@Test
+	void testKeySet() {
+		final Map<String, Integer> map = this.getTestMap();
+		assertFalse(map.keySet().contains("zero"));
+	}
+
+	/**
+	 * Test method for {@link org.unitConverter.math.ZeroIsNullMap#values()}.
+	 */
+	@Test
+	void testValues() {
+		final Map<String, Integer> map = this.getTestMap();
+		assertFalse(map.values().contains(0));
+	}
+
+}