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diff --git a/getdown/src/getdown/core/src/test/java/com/threerings/getdown/cache/GarbageCollectorTest.java b/getdown/src/getdown/core/src/test/java/com/threerings/getdown/cache/GarbageCollectorTest.java
new file mode 100644
index 0000000..d5a3937
--- /dev/null
+++ b/getdown/src/getdown/core/src/test/java/com/threerings/getdown/cache/GarbageCollectorTest.java
@@ -0,0 +1,71 @@
+//
+// Getdown - application installer, patcher and launcher
+// Copyright (C) 2004-2018 Getdown authors
+// https://github.com/threerings/getdown/blob/master/LICENSE
+
+package com.threerings.getdown.cache;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.*;
+import org.junit.rules.TemporaryFolder;
+
+import static org.junit.Assert.*;
+import static org.junit.Assume.assumeTrue;
+
+/**
+ * Validates that cache garbage is collected and deleted correctly.
+ */
+public class GarbageCollectorTest
+{
+    @Before public void setupFiles () throws IOException
+    {
+        _cachedFile = _folder.newFile("abc123.jar");
+        _lastAccessedFile = _folder.newFile("abc123.jar" + ResourceCache.LAST_ACCESSED_FILE_SUFFIX);
+    }
+
+    @Test public void shouldDeleteCacheEntryIfRetentionPeriodIsReached ()
+    {
+        gcNow();
+        assertFalse(_cachedFile.exists());
+        assertFalse(_lastAccessedFile.exists());
+    }
+
+    @Test public void shouldDeleteCacheFolderIfFolderIsEmpty ()
+    {
+        gcNow();
+        assertFalse(_folder.getRoot().exists());
+    }
+
+    private void gcNow() {
+        GarbageCollector.collect(_folder.getRoot(), -1);
+    }
+
+    @Test public void shouldKeepFilesInCacheIfRententionPeriodIsNotReached ()
+    {
+        GarbageCollector.collect(_folder.getRoot(), TimeUnit.DAYS.toMillis(1));
+        assertTrue(_cachedFile.exists());
+        assertTrue(_lastAccessedFile.exists());
+    }
+
+    @Test public void shouldDeleteCachedFileIfLastAccessedFileIsMissing ()
+    {
+        assumeTrue(_lastAccessedFile.delete());
+        gcNow();
+        assertFalse(_cachedFile.exists());
+    }
+
+    @Test public void shouldDeleteLastAccessedFileIfCachedFileIsMissing ()
+    {
+        assumeTrue(_cachedFile.delete());
+        gcNow();
+        assertFalse(_lastAccessedFile.exists());
+    }
+
+    @Rule public TemporaryFolder _folder = new TemporaryFolder();
+
+    private File _cachedFile;
+    private File _lastAccessedFile;
+}