Suppress unused method warnings

Also replace tabs with spaces.

Change-Id: Iea327b5094d080cbf244f0bb0b020bbaffcd34b0

src/test/java/com/googlesource/gerrit/plugins/hooks/util/PropertyExtractorTest.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/hooks/util/PropertyExtractorTest.java b/src/test/java/com/googlesource/gerrit/plugins/hooks/util/PropertyExtractorTest.java
index bb3f7df..5ca50e9 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/hooks/util/PropertyExtractorTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/hooks/util/PropertyExtractorTest.java
@@ -467,20 +467,24 @@
   }
 
   private class DummyChangeEvent extends ChangeEvent {
-	  public String getType() {
-		  return null;
-	  }
+    @SuppressWarnings("unused")
+    public String getType() {
+      return null;
+    }
 
-	  public Project.NameKey getProjectNameKey() {
-		  return null;
-	  }
+    @SuppressWarnings("unused")
+    public Project.NameKey getProjectNameKey() {
+      return null;
+    }
 
-	  public Change.Key getChangeKey() {
-		  return null;
-	  }
+    @SuppressWarnings("unused")
+    public Change.Key getChangeKey() {
+      return null;
+    }
 
-	  public String getRefName() {
-		  return null;
-	  }
+    @SuppressWarnings("unused")
+    public String getRefName() {
+      return null;
+    }
   }
-}
\ No newline at end of file
+}