updated dynamic extensions test

-// import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:get/utils.dart';
+
+class TestClass {
+  final name = "John";
+}
+
+class EmptyClass {}
 
 void main() {
-  // group('dynamic extensions', () {
-  //   var testString = '';
-  //   test('var.isNullOrBlank returns true on a not initilized variable', () {
-  //     expect(testString.isNullOrBlank, equals(true));
-  //   });
-  //   test('var.isNullOrBlank returns false on a initilized variable', () {
-  //     testString = 'Not null anymore';
-  //     expect(testString.isNullOrBlank, equals(false));
-  //   });
-  //   test('String extension: isNullOrBlank', () {
-  //     testString = '';
-  //     expect(testString.isNullOrBlank, equals(true));
-  //   });
-  // });
+  group('dynamic extensions', () {
+    test('var.isNullOrBlank on a string ', () {
+      var string = '';
+      expect('foo'.isNullOrBlank, equals(false));
+      expect(string.isNullOrBlank, equals(true));
+    });
+    test('var.isNullOrBlank on a int ', () {
+      expect(5.isNullOrBlank, equals(false));
+      expect(0.isNullOrBlank, equals(false));
+    });
+
+    test('var.isNullOrBlank on a double ', () {
+      expect(5.0.isNullOrBlank, equals(false));
+      expect(0.0.isNullOrBlank, equals(false));
+    });
+
+    test('var.isNullOrBlank on a list ', () {
+      var list = ['foo'];
+      expect([].isNullOrBlank, equals(true));
+      expect(['oi', 'foo'].isNullOrBlank, equals(false));
+      expect([{}, {}].isNullOrBlank, equals(false));
+      expect(list[0].isNullOrBlank, equals(false));
+    });
+
+    test('var.isNullOrBlank on a set ', () {
+      var halogens = {'fluorine', 'chlorine', 'bromine', 'iodine', 'astatine'};
+      expect(<String>{}.isNullOrBlank, equals(true));
+      expect({'foo', 'bar'}.isNullOrBlank, equals(false));
+      expect(halogens.isNullOrBlank, equals(false));
+    });
+
+    test('var.isNullOrBlank on a map ', () {
+      var map = {"foo": 'bar', "one": "um"};
+      expect({}.isNullOrBlank, equals(true));
+      expect({"other": "thing"}.isNullOrBlank, equals(false));
+      expect({'first': [], 'second': []}.isNullOrBlank, equals(false));
+      expect(map["foo"].isNullOrBlank, equals(false));
+      expect(map["other"].isNullOrBlank, equals(true));
+    });
+
+    test('var.isNullOrBlank on a function ', () {
+      someFunction({String string, int integer}) {
+        expect(string.isNullOrBlank, equals(false));
+        expect(integer.isNullOrBlank, equals(true));
+      }
+
+      someFunction(string: 'some value');
+    });
+
+    test('var.isNullOrBlank on a class ', () {
+      TestClass testClass;
+      expect(TestClass().isNullOrBlank, equals(false));
+      expect(testClass.isNullOrBlank, equals(true));
+      expect(EmptyClass().isNullOrBlank, equals(false));
+    });
+  });
 }