fix java client sample test

Author: frantuma

samples/client/petstore/java/jersey1/src/test/java/io/swagger/client/model/EnumValueTest.java

@@ -48,7 +48,7 @@ public void testEnumTest() {
             mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
             ObjectWriter ow = mapper.writer();
             String json = ow.writeValueAsString(enumTest);
-            assertEquals(json, "{\"enum_string\":\"lower\",\"enum_integer\":1,\"enum_number\":1.1,\"outerEnum\":null}");
+            assertEquals(json, "{\"enum_string\":\"lower\",\"enum_string_required\":null,\"enum_integer\":1,\"enum_number\":1.1,\"outerEnum\":null}");
 
             // test deserialization (json => object)
             EnumTest fromString = mapper.readValue(json, EnumTest.class);

samples/client/petstore/java/jersey2/src/test/java/io/swagger/client/model/EnumValueTest.java

@@ -48,7 +48,7 @@ public void testEnumTest() {
             mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
             ObjectWriter ow = mapper.writer();
             String json = ow.writeValueAsString(enumTest);
-            assertEquals(json, "{\"enum_string\":\"lower\",\"enum_integer\":1,\"enum_number\":1.1,\"outerEnum\":null}");
+            assertEquals(json, "{\"enum_string\":\"lower\",\"enum_string_required\":null,\"enum_integer\":1,\"enum_number\":1.1,\"outerEnum\":null}");
 
             // test deserialization (json => object)
             EnumTest fromString = mapper.readValue(json, EnumTest.class);

samples/client/petstore/java/okhttp-gson/src/test/java/io/swagger/client/model/EnumValueTest.java

@@ -42,8 +42,7 @@ public void testEnumTest() {
         // test serialization
         Gson gson = new Gson();
         String json = gson.toJson(enumTest);
-        assertEquals(json, "{\"enum_string\":\"lower\",\"enum_integer\":1,\"enum_number\":1.1}");
-
+        assertEquals(json, "{\"enum_string\":\"lower\",\"enum_string_required\":null,\"enum_integer\":1,\"enum_number\":1.1,\"outerEnum\":null}");
         // test deserialization
         EnumTest fromString = gson.fromJson(json, EnumTest.class);
         assertEquals(fromString.getEnumString().toString(), "lower");

samples/client/petstore/java/resttemplate/src/test/java/io/swagger/client/model/EnumValueTest.java

@@ -48,7 +48,7 @@ public void testEnumTest() {
             mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
             ObjectWriter ow = mapper.writer();
             String json = ow.writeValueAsString(enumTest);
-            assertEquals(json, "{\"enum_string\":\"lower\",\"enum_integer\":1,\"enum_number\":1.1,\"outerEnum\":null}");
+            assertEquals(json, "{\"enum_string\":\"lower\",\"enum_string_required\":null,\"enum_integer\":1,\"enum_number\":1.1,\"outerEnum\":null}");
 
             // test deserialization (json => object)
             EnumTest fromString = mapper.readValue(json, EnumTest.class);