add share test

Author: ca333

packages/share/test/share_test.dart

@@ -2,14 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:io';
 import 'dart:ui';
 
+import 'package:flutter/services.dart';
 import 'package:mockito/mockito.dart';
 import 'package:share/share.dart';
 import 'package:test/test.dart';
 
-import 'package:flutter/services.dart';
-
 void main() {
   MockMethodChannel mockChannel;
 
@@ -56,6 +56,58 @@ void main() {
       'originHeight': 4.0,
     }));
   });
+
+  test('sharing null file fails', () {
+    expect(
+      () => Share.shareFile(null),
+      throwsA(const TypeMatcher<AssertionError>()),
+    );
+    verifyZeroInteractions(mockChannel);
+  });
+
+  test('sharing empty file fails', () {
+    expect(
+      () => Share.shareFile(null),
+      throwsA(const TypeMatcher<AssertionError>()),
+    );
+    verifyZeroInteractions(mockChannel);
+  });
+
+  test('sharing non existing file fails', () {
+    expect(
+      () => Share.shareFile(File('/sdcard/nofile.txt')),
+      throwsA(const TypeMatcher<AssertionError>()),
+    );
+    verifyZeroInteractions(mockChannel);
+  });
+
+  test('sharing file sets correct mimeType', () async {
+    final File file = File('tempfile-83649a.png');
+    try {
+      file.createSync();
+      await Share.shareFile(file);
+      verify(mockChannel.invokeMethod('shareFile', <String, dynamic>{
+        'path': file.path,
+        'mimeType': 'image/png',
+      }));
+    } finally {
+      file.deleteSync();
+    }
+  });
+
+  test('sharing file sets passed mimeType', () async {
+    final File file = File('tempfile-83649a.png');
+    try {
+      file.createSync();
+      await Share.shareFile(file, mimeType: '*/*');
+      verify(mockChannel.invokeMethod('shareFile', <String, dynamic>{
+        'path': file.path,
+        'mimeType': '*/*',
+      }));
+    } finally {
+      file.deleteSync();
+    }
+  });
 }
 
 class MockMethodChannel extends Mock implements MethodChannel {}