This actually does work if you don't try to load encrypted archives. Begin work to allow saving/loading in memory for tests. woo.

src/test/java/net/runelite/cache/fs/DataFileTest.java

@@ -4,6 +4,7 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import org.junit.Assert;
+import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
@@ -12,6 +13,12 @@ public class DataFileTest
 {
 	@Rule
 	public TemporaryFolder folder = new TemporaryFolder();
+	
+	@BeforeClass
+	public static void before()
+	{
+		System.setProperty("java.io.tmpdir", "d:/temp");
+	}
   
 	@Test
 	public void test1() throws IOException

src/test/java/net/runelite/cache/fs/IndexFileTest.java

@@ -3,6 +3,7 @@ package net.runelite.cache.fs;
 import java.io.File;
 import java.io.IOException;
 import org.junit.Assert;
+import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
@@ -12,6 +13,12 @@ public class IndexFileTest
 	@Rule
 	public TemporaryFolder folder = new TemporaryFolder();
 	
+	@BeforeClass
+	public static void before()
+	{
+		System.setProperty("java.io.tmpdir", "d:/temp");
+	}
+	
 	@Test
 	public void test1() throws IOException
 	{

src/test/java/net/runelite/cache/fs/StoreLoadTest.java

@@ -8,7 +8,8 @@ public class StoreLoadTest
 	@Test
 	public void test() throws IOException
 	{
-		Store store = new Store(new java.io.File("c:/rs/cache"));
+		Store store = new Store(new java.io.File("d:/rs/07/cache"));//c:/rs/cache"));
 		store.load();
+		System.out.println(store);
 	}
 }

src/test/java/net/runelite/cache/fs/StoreTest.java

@@ -0,0 +1,25 @@
+package net.runelite.cache.fs;
+
+import java.io.IOException;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+public class StoreTest
+{
+	@Rule
+	public TemporaryFolder folder = new TemporaryFolder();
+	
+	@BeforeClass
+	public static void before()
+	{
+		System.setProperty("java.io.tmpdir", "d:/temp");
+	}
+	
+	@Test
+	public void testCreate() throws IOException
+	{
+		Store store = new Store(folder.getRoot());
+	}
+}