Adding tests, tweaking built_value code. (#5)

jsonexample/test/simple_object_unit_test.dart

@@ -0,0 +1,197 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jsonexample/built_value/built_simple_object.dart';
+import 'package:jsonexample/built_value/built_value_serializers.dart';
+import 'package:jsonexample/dart_convert/converted_simple_object.dart';
+import 'package:jsonexample/json_serializable/serializable_simple_object.dart';
+
+void main() {
+  const typicalObjectJson = <String, dynamic>{
+    'aString': 'Blah, blah, blah.',
+    'anInt': 1,
+    'aDouble': 1.0,
+    'aListOfStrings': ['one', 'two', 'three'],
+    'aListOfInts': [1, 2, 3],
+    'aListOfDoubles': [1.0, 2.0, 3.0]
+  };
+
+  const emptyListJson = <String, dynamic>{
+    'aString': 'Blah, blah, blah.',
+    'anInt': 1,
+    'aDouble': 1.0,
+    'aListOfStrings': [],
+    'aListOfInts': [],
+    'aListOfDoubles': []
+  };
+
+  const unexpectedPropertiesJson = <String, dynamic>{
+    'aString': 'Blah, blah, blah.',
+    'anInt': 1,
+    'aDouble': 1.0,
+    'aListOfStrings': ['one', 'two', 'three'],
+    'aListOfInts': [1, 2, 3],
+    'aListOfDoubles': [1.0, 2.0, 3.0],
+    'unexpectedProperty': 'Whoops!'
+  };
+
+  const emptyJson = <String, dynamic>{};
+
+  group('ConvertedSimpleObject unit tests', () {
+    test('Typical object is converted correctly', () {
+      final simpleObject = ConvertedSimpleObject.fromJson(typicalObjectJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, "Blah, blah, blah.");
+      expect(simpleObject.anInt, 1);
+      expect(simpleObject.aDouble, 1.0);
+      expect(simpleObject.aListOfStrings, ['one', 'two', 'three']);
+      expect(simpleObject.aListOfInts, [1, 2, 3]);
+      expect(simpleObject.aListOfDoubles, [1.0, 2.0, 3.0]);
+    });
+
+    test('Empty object', () {
+      final simpleObject = ConvertedSimpleObject.fromJson(emptyJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, isNull);
+      expect(simpleObject.anInt, isNull);
+      expect(simpleObject.aDouble, isNull);
+      expect(simpleObject.aListOfStrings, isNull);
+      expect(simpleObject.aListOfInts, isNull);
+      expect(simpleObject.aListOfDoubles, isNull);
+    });
+
+    test('Empty lists', () {
+      final simpleObject = ConvertedSimpleObject.fromJson(emptyListJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, "Blah, blah, blah.");
+      expect(simpleObject.anInt, 1);
+      expect(simpleObject.aDouble, 1.0);
+      expect(simpleObject.aListOfStrings, []);
+      expect(simpleObject.aListOfInts, []);
+      expect(simpleObject.aListOfDoubles, []);
+    });
+
+    test('Extra properties', () {
+      final simpleObject =
+          ConvertedSimpleObject.fromJson(unexpectedPropertiesJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, "Blah, blah, blah.");
+      expect(simpleObject.anInt, 1);
+      expect(simpleObject.aDouble, 1.0);
+      expect(simpleObject.aListOfStrings, ['one', 'two', 'three']);
+      expect(simpleObject.aListOfInts, [1, 2, 3]);
+      expect(simpleObject.aListOfDoubles, [1.0, 2.0, 3.0]);
+    });
+  });
+
+  group('SerializableSimpleObject unit tests', () {
+    test('Typical object is converted correctly', () {
+      final simpleObject = SerializableSimpleObject.fromJson(typicalObjectJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, "Blah, blah, blah.");
+      expect(simpleObject.anInt, 1);
+      expect(simpleObject.aDouble, 1.0);
+      expect(simpleObject.aListOfStrings, ['one', 'two', 'three']);
+      expect(simpleObject.aListOfInts, [1, 2, 3]);
+      expect(simpleObject.aListOfDoubles, [1.0, 2.0, 3.0]);
+    });
+
+    test('Empty object results in null fields', () {
+      final simpleObject = SerializableSimpleObject.fromJson(emptyJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, isNull);
+      expect(simpleObject.anInt, isNull);
+      expect(simpleObject.aDouble, isNull);
+      expect(simpleObject.aListOfStrings, isNull);
+      expect(simpleObject.aListOfInts, isNull);
+      expect(simpleObject.aListOfDoubles, isNull);
+    });
+
+    test('Empty lists are converted as empty lists', () {
+      final simpleObject = SerializableSimpleObject.fromJson(emptyListJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, "Blah, blah, blah.");
+      expect(simpleObject.anInt, 1);
+      expect(simpleObject.aDouble, 1.0);
+      expect(simpleObject.aListOfStrings, []);
+      expect(simpleObject.aListOfInts, []);
+      expect(simpleObject.aListOfDoubles, []);
+    });
+
+    test('Unexpected properties are ignored', () {
+      final simpleObject =
+          SerializableSimpleObject.fromJson(unexpectedPropertiesJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, "Blah, blah, blah.");
+      expect(simpleObject.anInt, 1);
+      expect(simpleObject.aDouble, 1.0);
+      expect(simpleObject.aListOfStrings, ['one', 'two', 'three']);
+      expect(simpleObject.aListOfInts, [1, 2, 3]);
+      expect(simpleObject.aListOfDoubles, [1.0, 2.0, 3.0]);
+    });
+  });
+
+  group('BuiltSimpleObject unit tests', () {
+    test('Typical object is converted correctly', () {
+      final simpleObject = serializers.deserializeWith(
+          BuiltSimpleObject.serializer, typicalObjectJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, "Blah, blah, blah.");
+      expect(simpleObject.anInt, 1);
+      expect(simpleObject.aDouble, 1.0);
+      expect(simpleObject.aListOfStrings, ['one', 'two', 'three']);
+      expect(simpleObject.aListOfInts, [1, 2, 3]);
+      expect(simpleObject.aListOfDoubles, [1.0, 2.0, 3.0]);
+    });
+
+    test('Empty object results in null fields', () {
+      final simpleObject =
+          serializers.deserializeWith(BuiltSimpleObject.serializer, emptyJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, isNull);
+      expect(simpleObject.anInt, isNull);
+      expect(simpleObject.aDouble, isNull);
+      expect(simpleObject.aListOfStrings, isNull);
+      expect(simpleObject.aListOfInts, isNull);
+      expect(simpleObject.aListOfDoubles, isNull);
+    });
+
+    test('Empty lists are converted as empty lists', () {
+      final simpleObject = serializers.deserializeWith(
+          BuiltSimpleObject.serializer, emptyListJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, "Blah, blah, blah.");
+      expect(simpleObject.anInt, 1);
+      expect(simpleObject.aDouble, 1.0);
+      expect(simpleObject.aListOfStrings, []);
+      expect(simpleObject.aListOfInts, []);
+      expect(simpleObject.aListOfDoubles, []);
+    });
+
+    test('Unexpected properties are ignored', () {
+      final simpleObject = serializers.deserializeWith(
+          BuiltSimpleObject.serializer, unexpectedPropertiesJson);
+
+      expect(simpleObject, isNotNull);
+      expect(simpleObject.aString, "Blah, blah, blah.");
+      expect(simpleObject.anInt, 1);
+      expect(simpleObject.aDouble, 1.0);
+      expect(simpleObject.aListOfStrings, ['one', 'two', 'three']);
+      expect(simpleObject.aListOfInts, [1, 2, 3]);
+      expect(simpleObject.aListOfDoubles, [1.0, 2.0, 3.0]);
+    });
+  });
+}