test(Extensions): add unit tests for context media query extensions

Signed-off-by: arafaysaleem <[email protected]>

pubspec.lock

@@ -520,6 +520,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.0"
+  mockito:
+    dependency: "direct main"
+    description:
+      name: mockito
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "5.0.13"
   octo_image:
     dependency: transitive
     description:

pubspec.yaml

@@ -27,6 +27,7 @@ dependencies:
   flutter_spinkit: 5.0.0
   flutter_secure_storage: ^4.2.1
   clock: ^1.1.0
+  mockito: ^5.0.13
 dev_dependencies:
   flutter_test:
     sdk: flutter

test/helper/extensions/context_extension_test.dart

@@ -0,0 +1,75 @@
+import 'package:ez_ticketz_app/helper/extensions/context_extensions.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+
+import 'context_extension_test.mocks.dart';
+
+@GenerateMocks([BuildContext])
+void main() {
+  group('ContextUtils', () {
+    group('extensions related to MediaQuery', () {
+      BuildContext _mockContextWithMediaQuery(Size size) {
+        final context = MockBuildContext();
+        final mediaQuery = MediaQuery(
+          data: MediaQueryData(size: size),
+          child: const SizedBox.shrink(),
+        );
+        when(context.widget).thenReturn(const SizedBox.shrink());
+        when(context.findAncestorWidgetOfExactType()).thenReturn(mediaQuery);
+        when(context.dependOnInheritedWidgetOfExactType<MediaQuery>())
+            .thenReturn(mediaQuery);
+        return context;
+      }
+
+      group('screenWidth', () {
+        test(
+          'GIVEN a Size created with a screen width '
+          'AND a BuildContext with MediaQuery '
+          'AND that MediaQuery has that Size '
+          'WHEN extension method `.screenWidth` is called '
+          'THEN a double is returned '
+          'AND is equal to that screen width',
+          () {
+            //given
+            const screenWidth = 500.0;
+            const size = Size.fromWidth(screenWidth);
+            final context = _mockContextWithMediaQuery(size);
+
+            //when
+            final actual = context.screenWidth;
+
+            //then
+            expect(actual, isA<double>());
+            expect(actual, screenWidth);
+          },
+        );
+      });
+
+      group('screenHeight', () {
+        test(
+          'GIVEN a Size created with a screen height '
+          'AND a BuildContext with MediaQuery '
+          'AND that MediaQuery has that Size '
+          'WHEN extension method `.screenHeight` is called '
+          'THEN a double is returned '
+          'AND is equal to that screen height',
+          () {
+            //given
+            const screenHeight = 650.0;
+            const size = Size.fromHeight(screenHeight);
+            final context = _mockContextWithMediaQuery(size);
+
+            //when
+            final actual = context.screenHeight;
+
+            //then
+            expect(actual, isA<double>());
+            expect(actual, screenHeight);
+          },
+        );
+      });
+    });
+  });
+}