Added ContentResolver.openOutputStream returning a dummy outputstream
diff --git a/src/main/java/com/xtremelabs/robolectric/shadows/ShadowContentResolver.java b/src/main/java/com/xtremelabs/robolectric/shadows/ShadowContentResolver.java
index 50ec3b4..8c5e4bd 100644
--- a/src/main/java/com/xtremelabs/robolectric/shadows/ShadowContentResolver.java
+++ b/src/main/java/com/xtremelabs/robolectric/shadows/ShadowContentResolver.java
@@ -12,6 +12,7 @@
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.util.*;
 
 @Implements(ContentResolver.class)
@@ -73,6 +74,21 @@
             }
         };
     }
+    
+    @Implementation
+    public final OutputStream openOutputStream(final Uri uri) {
+        return new OutputStream() {
+            
+            @Override
+            public void write(int arg0) throws IOException {                
+            }
+
+            @Override
+            public String toString() {
+                return "outputstream for " + uri;
+            }
+        };
+    }
 
     @Implementation
     public final Uri insert(Uri url, ContentValues values) {
diff --git a/src/test/java/com/xtremelabs/robolectric/shadows/ContentResolverTest.java b/src/test/java/com/xtremelabs/robolectric/shadows/ContentResolverTest.java
index 899c24f..a29aaa4 100644
--- a/src/test/java/com/xtremelabs/robolectric/shadows/ContentResolverTest.java
+++ b/src/test/java/com/xtremelabs/robolectric/shadows/ContentResolverTest.java
@@ -11,6 +11,7 @@
 import static org.junit.Assert.*;
 
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -176,6 +177,11 @@
     }
 
     @Test
+    public void openOutputStream_shouldReturnAnOutputStream() throws Exception {
+        assertThat(contentResolver.openOutputStream(uri21), CoreMatchers.instanceOf(OutputStream.class));
+    }
+
+    @Test
     public void shouldTrackNotifiedUris() throws Exception {
         contentResolver.notifyChange(Uri.parse("foo"), null, true);
         contentResolver.notifyChange(Uri.parse("bar"), null);