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diff --git a/getdown/src/getdown/core/src/test/java/com/threerings/getdown/util/FileUtilTest.java b/getdown/src/getdown/core/src/test/java/com/threerings/getdown/util/FileUtilTest.java
new file mode 100644
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--- /dev/null
+++ b/getdown/src/getdown/core/src/test/java/com/threerings/getdown/util/FileUtilTest.java
@@ -0,0 +1,60 @@
+//
+// Getdown - application installer, patcher and launcher
+// Copyright (C) 2004-2018 Getdown authors
+// https://github.com/threerings/getdown/blob/master/LICENSE
+
+package com.threerings.getdown.util;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.List;
+
+import org.junit.*;
+import org.junit.rules.TemporaryFolder;
+
+import static org.junit.Assert.*;
+
+/**
+ * Tests {@link FileUtil}.
+ */
+public class FileUtilTest
+{
+    @Test public void testReadLines () throws IOException
+    {
+        String data = "This is a test\nof a file with\na few lines\n";
+        List<String> lines = FileUtil.readLines(new StringReader(data));
+        String[] linesBySplit = data.split("\n");
+        assertEquals(linesBySplit.length, lines.size());
+        for (int ii = 0; ii < lines.size(); ii++) {
+            assertEquals(linesBySplit[ii], lines.get(ii));
+        }
+    }
+
+    @Test public void shouldCopyFile () throws IOException
+    {
+        File source = _folder.newFile("source.txt");
+        File target = new File(_folder.getRoot(), "target.txt");
+        assertFalse(target.exists());
+        FileUtil.copy(source, target);
+        assertTrue(target.exists());
+    }
+
+    @Test public void shouldRecursivelyWalkOverFilesAndFolders () throws IOException
+    {
+        _folder.newFile("a.txt");
+        new File(_folder.newFolder("b"), "b.txt").createNewFile();
+
+        class CountingVisitor implements FileUtil.Visitor {
+            int fileCount = 0;
+            @Override public void visit(File file) {
+                fileCount++;
+            }
+        }
+        CountingVisitor visitor = new CountingVisitor();
+        FileUtil.walkTree(_folder.getRoot(), visitor);
+        assertEquals(3, visitor.fileCount);
+    }
+
+    @Rule public TemporaryFolder _folder = new TemporaryFolder();
+}