Example for Unit Test (#52)

unit_testing/lib/api/Places.dart

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+import 'package:unit_testing/model/lat_long.dart';
+import 'package:unit_testing/model/location.dart';
+
+class PlacesAPI {
+  final List<Location> _locations = [
+    Location(
+      id: 1,
+      name: "Kumarakom Backwaters",
+      country: "India",
+      info: "Kerala’s scenic backwaters, "
+          "edged with coconut palms, "
+          "lush green rice paddies and picturesque villages,"
+          "make for a beautiful escape from hectic city life.",
+      image: "assets/1.jpeg",
+      latlong: LatLong(
+        latitude: 9.9540358,
+        longitude: 76.2671037,
+      ),
+    ),
+    Location(
+      id: 2,
+      name: "Angel Falls",
+      country: "Venezuela",
+      info: "Venezuela overflows with natural wonders, "
+          "including the world's highest waterfall—the 3,212-foot cascades of Angel Falls,"
+          " located in the UNESCO-protected Canaima National Park. "
+          "Canaima is by far the country's most popular attraction,"
+          " and the falls stretch an astounding 19 times higher than Niagara Falls. ",
+      image: "assets/2.jpg",
+      latlong: LatLong(
+        latitude: 5.9689135,
+        longitude: -62.5376132,
+      ),
+    ),
+    Location(
+      id: 3,
+      name: "Avenue of the Baobabs",
+      country: "Madagascar",
+      info:
+          "Separated from continental Africa by 250 miles of water, Madagascar "
+          "is the greatest adventure"
+          " you haven't had yet. The island nation's secrets include giant moths, "
+          "bug-eyed lemurs, and places like the surreal Avenue of the Baobabs,"
+          " where the centuries-old trees reach heights of nearly 100 feet.",
+      image: "assets/3.jpg",
+      latlong: LatLong(
+        latitude: -20.2498059,
+        longitude: 44.4172047,
+      ),
+    ),
+    Location(
+      id: 4,
+      name: "Denali National Park",
+      country: " Alaska",
+      info: "Despite controversies over name changes and a shrinking elevation,"
+          " Denali's beauty is worth braving the extreme low temperatures. Make a "
+          "road trip out of your visit, seeing as "
+          "much of the 6 million acres of shimmering lakes and jagged mountains as you can.",
+      image: "assets/4.jpg",
+      latlong: LatLong(
+        latitude: 63.2092486,
+        longitude: -152.2366999,
+      ),
+    ),
+  ];
+
+  Future<List<Location>> fetchAllPlaces() {
+    return Future.delayed(Duration(seconds: 3), () {
+      return _locations;
+    });
+  }
+}

unit_testing/lib/components/place_info_card.dart

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+import 'package:flutter/material.dart';
+import 'package:unit_testing/model/location.dart';
+
+class PlaceInfo extends StatelessWidget {
+  final Location data;
+  PlaceInfo({this.data});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      margin: const EdgeInsets.all(20),
+      padding: const EdgeInsets.all(10.0),
+      decoration: BoxDecoration(
+        color: Colors.white,
+        borderRadius: BorderRadius.circular(15),
+        boxShadow: [
+          BoxShadow(
+            offset: Offset(0, 10),
+            blurRadius: 20,
+            color: Colors.black45,
+          )
+        ],
+      ),
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        crossAxisAlignment: CrossAxisAlignment.center,
+        children: [
+          Text(
+            data.name + "\n" + data.country,
+            style: TextStyle(
+              fontSize: 25,
+              color: Colors.black,
+              fontWeight: FontWeight.bold,
+            ),
+            textAlign: TextAlign.center,
+          ),
+          SizedBox(
+            height: 20,
+          ),
+          Image.asset(
+            data.image,
+            fit: BoxFit.fill,
+          ),
+          SizedBox(
+            height: 20,
+          ),
+          Text(
+            data.info,
+            style: TextStyle(fontSize: 23),
+          ),
+        ],
+      ),
+    );
+  }
+}

unit_testing/lib/helpers.dart

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+import 'package:unit_testing/api/Places.dart';
+import 'package:unit_testing/model/location.dart';
+
+class TouristPlaces {
+  static Future<List<Location>> getData() async {
+    // Here we can call a real API.
+    return await PlacesAPI().fetchAllPlaces();
+  }
+}
+
+class FormValidator {
+  static String validateEmail(String email) {
+    final pattern = RegExp(
+        r"^[a-zA-Z0-9.a-zA-Z0-9.!#$%&'*+-/=?^_`{|}~]+@[a-zA-Z0-9]+\.[a-zA-Z]+");
+    if (email.isEmpty) {
+      return "please enter email";
+    } else if (!pattern.hasMatch(email)) {
+      return "please enter valid email";
+    } else {
+      return null;
+    }
+  }
+
+  static String validatePassword(String password) {
+    if (password.isEmpty) {
+      return "please enter your password";
+    } else if (password.length < 8) {
+      return "minimum lenght of password must be 8 characters";
+    } else {
+      return null;
+    }
+  }
+}

unit_testing/lib/main.dart

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+import 'package:flutter/material.dart';
+import 'package:unit_testing/screens/home_screen.dart';
+import 'package:unit_testing/screens/sign_in_screen.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      debugShowCheckedModeBanner: false,
+      title: 'Material App',
+      initialRoute: "/",
+      routes: {
+        "/": (context) => SignInScreen(),
+        "/homeScreen": (context) => HomeScreen(),
+      },
+    );
+  }
+}

unit_testing/lib/model/lat_long.dart

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+class LatLong {
+  final double latitude;
+  final double longitude;
+  LatLong({this.latitude, this.longitude});
+}

unit_testing/lib/model/location.dart

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+import 'lat_long.dart';
+
+class Location {
+  final int id;
+  final String name;
+  final String image;
+  final LatLong latlong;
+  final String country;
+  final String info;
+  Location({
+    this.id,
+    this.name,
+    this.image,
+    this.latlong,
+    this.country,
+    this.info,
+  });
+}

unit_testing/lib/screens/home_screen.dart

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+import 'package:flutter/material.dart';
+import 'package:unit_testing/components/place_info_card.dart';
+import 'package:unit_testing/model/location.dart';
+
+import '../helpers.dart';
+
+class HomeScreen extends StatefulWidget {
+  @override
+  _HomeScreenState createState() => _HomeScreenState();
+}
+
+class _HomeScreenState extends State<HomeScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('Unit Test'),
+        centerTitle: true,
+      ),
+      body: FutureBuilder(
+        future: TouristPlaces.getData(), // this functions calls API.
+        builder: (BuildContext context, AsyncSnapshot snapshot) {
+          if (snapshot.hasData) {
+            final List<Location> data = snapshot.data;
+            return ListView.builder(
+              physics: BouncingScrollPhysics(),
+              itemCount: data.length,
+              itemBuilder: (context, index) => PlaceInfo(
+                data: data[index],
+              ),
+            );
+          } else {
+            return Center(child: CircularProgressIndicator());
+          }
+        },
+      ),
+    );
+  }
+}

unit_testing/lib/screens/sign_in_screen.dart

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+import 'package:flutter/material.dart';
+import 'package:unit_testing/helpers.dart';
+
+class SignInScreen extends StatefulWidget {
+  @override
+  _SignInScreenState createState() => _SignInScreenState();
+}
+
+class _SignInScreenState extends State<SignInScreen> {
+  final _formKey = GlobalKey<FormState>();
+
+  @override
+  Widget build(BuildContext context) {
+    return Material(
+      child: Padding(
+        padding: const EdgeInsets.all(40.0),
+        child: Form(
+          key: _formKey,
+          child: Column(
+            children: [
+              Icon(
+                Icons.account_circle,
+                size: 200,
+              ),
+              SizedBox(
+                height: 50,
+              ),
+              TextFormField(
+                validator: (value) => FormValidator.validateEmail(value),
+                decoration: InputDecoration(
+                  hintText: "Email",
+                ),
+              ),
+              SizedBox(
+                height: 50,
+              ),
+              TextFormField(
+                validator: (value) => FormValidator.validatePassword(value),
+                decoration: InputDecoration(
+                  hintText: "Password",
+                ),
+              ),
+              SizedBox(
+                height: 50,
+              ),
+              RaisedButton(
+                onPressed: () {
+                  if (_formKey.currentState.validate()) {
+                    Navigator.of(context).pushReplacementNamed('/homeScreen');
+                  }
+                },
+                child: Text('Sign In'),
+              )
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}