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diff --git a/src/test/java/com/jsyn/unitgen/TestFunction.java b/src/test/java/com/jsyn/unitgen/TestFunction.java
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+/*
+ * Copyright 2009 Phil Burk, Mobileer Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jsyn.unitgen;
+
+import com.jsyn.JSyn;
+import com.jsyn.Synthesizer;
+import com.jsyn.data.DoubleTable;
+import com.jsyn.data.Function;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * @author Phil Burk, (C) 2009 Mobileer Inc
+ */
+public class TestFunction {
+    Synthesizer synth;
+
+    @BeforeEach
+    protected void beforeEach() {
+        synth = JSyn.createSynthesizer();
+        synth.setRealTime(false);
+        synth.start();
+    }
+
+    @AfterEach
+    protected void afterEach() {
+        synth.stop();
+    }
+
+    @Test
+    public void testDoubleTable() {
+        double[] data = {
+                2.0, 0.0, 3.0
+        };
+        DoubleTable table = new DoubleTable(data);
+        assertEquals(2.0, table.evaluate(-1.4), "DoubleTable below");
+        assertEquals(2.0, table.evaluate(-1.0), "DoubleTable edge");
+        assertEquals(1.0, table.evaluate(-0.5), "DoubleTable mid");
+        assertEquals(0.0, table.evaluate(0.0), "DoubleTable zero");
+        assertEquals(0.75, table.evaluate(0.25), "DoubleTable mid");
+        assertEquals(3.0, table.evaluate(1.3), "DoubleTable above");
+
+    }
+
+    @Test
+    public void testFunctionEvaluator() throws InterruptedException {
+        FunctionEvaluator shaper = new FunctionEvaluator();
+        synth.add(shaper);
+        shaper.start();
+
+        Function cuber = x -> x * x * x;
+        shaper.function.set(cuber);
+
+        shaper.input.set(0.5);
+        synth.sleepFor(0.001);
+
+        assertEquals((0.5 * 0.5 * 0.5), shaper.output.getValue(), "Cuber");
+    }
+
+}