Validate test added

Author: BrawlerXull

test/taskfunctions/validate_test.dart

@@ -0,0 +1,24 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:taskwarrior/app/utils/taskfunctions/validate.dart';
+
+void main() {
+  test('validateTaskDescription', () {
+    expect(() => validateTaskDescription('Write test cases'), returnsNormally);
+
+    expect(() => validateTaskDescription(''), throwsFormatException);
+
+    expect(() => validateTaskDescription('Do something\\'), throwsFormatException);
+  });
+
+  test('validateTaskProject', () {
+    expect(() => validateTaskProject('Personal'), returnsNormally);
+
+    expect(() => validateTaskProject('Work\\'), throwsFormatException);
+  });
+
+  test('validateTaskTags', () {
+    expect(() => validateTaskTags('important'), returnsNormally);
+
+    expect(() => validateTaskTags('urgent tasks'), throwsFormatException);
+  });
+}