init dart test case

.gitignore

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+# Files and directories created by pub
+.dart_tool/
+.packages
+# Remove the following pattern if you wish to check in your lock file
+pubspec.lock
+
+# Conventional directory for build outputs
+build/
+
+# Directory created by dartdoc
+doc/api/
+
+.idea

CHANGELOG.md

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+## 1.0.0
+
+- Initial version, created by Stagehand

README.md

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+A sample command-line application with an entrypoint in `bin/`, library code
+in `lib/`, and example unit test in `test/`.
+
+Created from templates made available by Stagehand under a BSD-style
+[license](https://github.com/dart-lang/stagehand/blob/master/LICENSE).

analysis_options.yaml

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+# Defines a default set of lint rules enforced for
+# projects at Google. For details and rationale,
+# see https://github.com/dart-lang/pedantic#enabled-lints.
+include: package:pedantic/analysis_options.yaml
+
+# For lint rules and documentation, see http://dart-lang.github.io/linter/lints.
+# Uncomment to specify additional rules.
+# linter:
+#   rules:
+#     - camel_case_types
+
+analyzer:
+#   exclude:
+#     - path/to/excluded/files/**

lib/Bicycle.dart

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+class Bicycle {
+  int age;
+
+  Bicycle({this.age});
+
+  factory Bicycle.fromJson(Map<String, dynamic> json) {
+    return Bicycle(
+      age: json['age'],
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> data = new Map<String, dynamic>();
+    data['age'] = this.age;
+    return data;
+  }
+}

lib/main.dart

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+import 'package:xdart_test/Bicycle.dart';
+import 'package:xdart_test/xdart_test.dart' as c_test;
+
+//
+void main(List<String> arguments) {
+  for (var arg in arguments) {
+    print(arg);
+  }
+  var bike = Bicycle(age: 100);
+  var info = bike.toString();
+  var json = bike.toJson();
+  print('bike info:$json');
+  var num = 100;
+  print('this is num:$num');
+  print('Hello world: ${c_test.calculate()}!');
+}

lib/xdart_test.dart

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+int calculate() {
+  return 56 * 7;
+}

pubspec.yaml

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+name: xdart_test
+description: A sample command-line application.
+# version: 1.0.0
+# homepage: https://www.example.com
+
+environment:
+  sdk: '>=2.7.0 <3.0.0'
+
+#dependencies:
+#  path: ^1.6.0
+
+dev_dependencies:
+  pedantic: ^1.8.0
+  test: ^1.6.0

test/xdart_test_test.dart

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+import 'package:test/test.dart';
+import 'package:xdart_test/xdart_test.dart';
+
+void main() {
+  test('calculate', () {
+    expect(calculate(), 392);
+  });
+}