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diff --git a/src/test/java/com/jsyn/engine/TestDevices.java b/src/test/java/com/jsyn/engine/TestDevices.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.engine;
+
+import com.jsyn.JSyn;
+import com.jsyn.Synthesizer;
+import com.jsyn.devices.AudioDeviceFactory;
+import com.jsyn.devices.AudioDeviceManager;
+import com.jsyn.unitgen.LineIn;
+import com.jsyn.unitgen.LineOut;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class TestDevices {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(TestDevices.class);
+
+    @Test
+    public void testPassThrough() {
+        Synthesizer synth;
+        LineIn lineIn;
+        LineOut lineOut;
+        // Create a context for the synthesizer.
+        synth = JSyn.createSynthesizer(AudioDeviceFactory.createAudioDeviceManager(true));
+        // Add an audio input.
+        synth.add(lineIn = new LineIn());
+        // Add an audio output.
+        synth.add(lineOut = new LineOut());
+        // Connect the input to the output.
+        lineIn.output.connect(0, lineOut.input, 0);
+        lineIn.output.connect(1, lineOut.input, 1);
+
+        // Both stereo.
+        int numInputChannels = 2;
+        int numOutputChannels = 2;
+        synth.start(44100, AudioDeviceManager.USE_DEFAULT_DEVICE, numInputChannels,
+                AudioDeviceManager.USE_DEFAULT_DEVICE, numOutputChannels);
+
+        // We only need to start the LineOut. It will pull data from the LineIn.
+        lineOut.start();
+        LOGGER.debug("Audio passthrough started.");
+        // Sleep a while.
+        double sleepTime = 2.0;
+        try {
+            double time = synth.getCurrentTime();
+            // Sleep for a few seconds.
+            synth.sleepUntil(time + sleepTime);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        double synthTime = synth.getCurrentTime();
+        assertEquals(synthTime, 0.2, "Time has advanced. " + synthTime);
+        // Stop everything.
+        synth.stop();
+        LOGGER.debug("All done.");
+
+    }
+}