diff --git a/src/test/java/net/openhft/chronicle/map/ArrayTest.java b/src/test/java/net/openhft/chronicle/map/ArrayTest.java
new file mode 100644
index 000000000..3d9daccac
--- /dev/null
+++ b/src/test/java/net/openhft/chronicle/map/ArrayTest.java
@@ -0,0 +1,49 @@
+package net.openhft.chronicle.map;
+
+import net.openhft.chronicle.core.OS;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.IOException;
+
+public class ArrayTest {
+    // don't use Double[] as it uses ~3.5x the memory of a double[]
+    @Test
+    public void testDoubleArray() throws IOException {
+        File file = new File(OS.getTarget() + "/testDoubleArray-" + System.nanoTime());
+        ChronicleMap<Long, double[]> writeMap = ChronicleMapBuilder
+                .of(Long.class, double[].class)
+                .entries(1_000)
+                .averageValue(new double[150])
+                .createPersistedTo(file);
+        double a[] = {2D};
+        writeMap.put(1L, a);
+
+        //read
+        ChronicleMap<Long, double[]> readMap =
+                ChronicleMapBuilder.of(Long.class, double[].class)
+                        .averageValue(new double[150])
+                        .createPersistedTo(file);
+        double b[] = readMap.get(1L);
+    }
+
+    // don't use Long[] as it uses ~3.5x the memory of a long[]
+    @Test
+    public void testLongArray() throws IOException {
+        File file = new File(OS.getTarget() + "/testLongArray-" + System.nanoTime());
+        ChronicleMap<Long, long[]> writeMap = ChronicleMapBuilder
+                .of(Long.class, long[].class)
+                .entries(1_000)
+                .averageValue(new long[150])
+                .createPersistedTo(file);
+        long a[] = {2};
+        writeMap.put(1L, a);
+
+        //read
+        ChronicleMap<Long, long[]> readMap =
+                ChronicleMapBuilder.of(Long.class, long[].class)
+                        .averageValue(new long[150])
+                        .createPersistedTo(file);
+        long b[] = readMap.get(1L);
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/net/openhft/lang/values/ArrayTest.java b/src/test/java/net/openhft/lang/values/ArrayTest.java
deleted file mode 100644
index 788f43f9c..000000000
--- a/src/test/java/net/openhft/lang/values/ArrayTest.java
+++ /dev/null
@@ -1,31 +0,0 @@
-package net.openhft.lang.values;
-
-import java.io.File;
-import java.io.IOException;
-
-import org.junit.Test;
-
-import net.openhft.chronicle.map.ChronicleMap;
-import net.openhft.chronicle.map.ChronicleMapBuilder;
-
-public class ArrayTest {
-	@Test
-    public void test() throws IOException {
-		String TMP = System.getProperty("java.io.tmpdir");
-        File file = new File(TMP + "/pf-PosistionsAndClose-" + System.nanoTime());
-        ChronicleMap<Long, Double[]> writeMap = ChronicleMapBuilder
-			    .of(Long.class, Double[].class)
-			    .entries(1_000)
-			    .averageValue(new Double[150])
-			    .createPersistedTo(file); 
-    	Double a[]={2D};
-    	writeMap.put(1L,a);
-    	
-    	//read
-        ChronicleMap<Long, Double[]> readMap =
-        		ChronicleMapBuilder.of(Long.class, Double[].class)
-        		.averageValue(new Double[150])
-        		.createPersistedTo(file);
-        Double b[] = readMap.get(1L);
-	}
-}