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diff --git a/getdown/src/getdown/core/src/test/java/com/threerings/getdown/data/PathBuilderTest.java b/getdown/src/getdown/core/src/test/java/com/threerings/getdown/data/PathBuilderTest.java
new file mode 100644
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--- /dev/null
+++ b/getdown/src/getdown/core/src/test/java/com/threerings/getdown/data/PathBuilderTest.java
@@ -0,0 +1,70 @@
+//
+// Getdown - application installer, patcher and launcher
+// Copyright (C) 2004-2018 Getdown authors
+// https://github.com/threerings/getdown/blob/master/LICENSE
+
+package com.threerings.getdown.data;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.Arrays;
+
+import org.junit.*;
+import org.junit.rules.TemporaryFolder;
+import org.junit.runner.RunWith;
+import static org.junit.Assert.assertEquals;
+
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import static org.mockito.Mockito.when;
+
+@RunWith(MockitoJUnitRunner.class)
+public class PathBuilderTest
+{
+    @Before public void setupFilesAndResources () throws IOException
+    {
+        _firstJarFile = _appdir.newFile("a.jar");
+        _secondJarFile = _appdir.newFile("b.jar");
+
+        when(_firstJar.getFinalTarget()).thenReturn(_firstJarFile);
+        when(_secondJar.getFinalTarget()).thenReturn(_secondJarFile);
+        when(_application.getActiveCodeResources()).thenReturn(Arrays.asList(_firstJar, _secondJar));
+        when(_application.getAppDir()).thenReturn(_appdir.getRoot());
+    }
+
+    @Test public void shouldBuildDefaultClassPath () throws IOException
+    {
+        ClassPath classPath = PathBuilder.buildDefaultClassPath(_application);
+        String expectedClassPath = _firstJarFile.getAbsolutePath() + File.pathSeparator +
+            _secondJarFile.getAbsolutePath();
+        assertEquals(expectedClassPath, classPath.asArgumentString());
+    }
+
+    @Test public void shouldBuildCachedClassPath () throws IOException
+    {
+        when(_application.getDigest(_firstJar)).thenReturn("first");
+        when(_application.getDigest(_secondJar)).thenReturn("second");
+        when(_application.getCodeCacheRetentionDays()).thenReturn(1);
+
+        Path firstCachedJarFile = _appdir.getRoot().toPath().
+            resolve(PathBuilder.CODE_CACHE_DIR).resolve("fi").resolve("first.jar");
+
+        Path secondCachedJarFile = _appdir.getRoot().toPath().
+            resolve(PathBuilder.CODE_CACHE_DIR).resolve("se").resolve("second.jar");
+
+        String expectedClassPath = firstCachedJarFile.toAbsolutePath() + File.pathSeparator +
+            secondCachedJarFile.toAbsolutePath();
+
+        ClassPath classPath = PathBuilder.buildCachedClassPath(_application);
+        assertEquals(expectedClassPath, classPath.asArgumentString());
+    }
+
+    @Mock protected Application _application;
+    @Mock protected Resource _firstJar;
+    @Mock protected Resource _secondJar;
+
+    protected File _firstJarFile, _secondJarFile;
+
+    @Rule public TemporaryFolder _appdir = new TemporaryFolder();
+}