Add Hasher tests for objects where key eq value

test/unittest/schematest.cpp

@@ -99,6 +99,9 @@ TEST(SchemaValidator, Hasher) {
     TEST_HASHER("{\"a\":1}", "{\"a\":1}", true);
     TEST_HASHER("{\"a\":1}", "{\"b\":1}", false);
     TEST_HASHER("{\"a\":1}", "{\"a\":2}", false);
+    TEST_HASHER("{\"a\":\"a\"}", "{\"b\":\"b\"}", false); // Key equals value hashing
+    TEST_HASHER("{\"a\":\"a\", \"b\":\"b\"}", "{\"c\":\"c\", \"d\":\"d\"}", false);
+    TEST_HASHER("{\"a\":\"a\"}", "{\"b\":\"b\", \"c\":\"c\"}", false);
     TEST_HASHER("{\"a\":1, \"b\":2}", "{\"b\":2, \"a\":1}", true); // Member order insensitive
     TEST_HASHER("{}", "null", false);
     TEST_HASHER("{}", "false", false);