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diff --git a/src/test/java/org/unitConverter/math/ExpressionParserTest.java b/src/test/java/org/unitConverter/math/ExpressionParserTest.java
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+++ b/src/test/java/org/unitConverter/math/ExpressionParserTest.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 org.junit.jupiter.api.Test;
+
+/**
+ * A test for the {@code ExpressionParser} class. This is NOT part of this program's public API.
+ * 
+ * @author Adrien Hopkins
+ * @since 2019-03-22
+ * @since v0.2.0
+ */
+class ExpressionParserTest {
+	private static final ExpressionParser<Integer> numberParser = new ExpressionParser.Builder<>(Integer::parseInt)
+			.addBinaryOperator("+", (o1, o2) -> o1 + o2, 0).addBinaryOperator("-", (o1, o2) -> o1 - o2, 0)
+			.addBinaryOperator("*", (o1, o2) -> o1 * o2, 1).addBinaryOperator("/", (o1, o2) -> o1 / o2, 1)
+			.addBinaryOperator("^", (o1, o2) -> (int) Math.pow(o1, o2), 2).build();
+
+	/**
+	 * Test method for {@link org.unitConverter.math.ExpressionParser#parseExpression(java.lang.String)}.
+	 */
+	@Test
+	public void testParseExpression() {
+		// test parsing of expressions
+		assertEquals((int) numberParser.parseExpression("1 + 2 ^ 5 * 3"), 97);
+		assertEquals((int) numberParser.parseExpression("(1 + 2) ^ 5 * 3"), 729);
+
+		// ensure it normally goes left to right
+		assertEquals((int) numberParser.parseExpression("1 + 2 + 3 + 4"), 10);
+		assertEquals((int) numberParser.parseExpression("12 - 4 - 3"), 5);
+		assertEquals((int) numberParser.parseExpression("12 - (4 - 3)"), 11);
+		assertEquals((int) numberParser.parseExpression("1 / 2 + 3"), 3);
+	}
+
+}