There is a class having a dependency of IFoo interface, and IFoo contains IBar interface as a property and IBar\u00a0have a method, which is what I want to mock.<\/p>\n Let’s think about a class like below.<\/p>\n MoqTest class have a dependency of IFoo. IFoo has a Bar class and Bar class have a DoBar method. We want to mock Foo, Bar, and Dobar.<\/p>\n What I need to test is the logic inside Run method of MoqTest class, so I need to mock Foo, Bar and Dobar.<\/p>\n Now, quickly have a look at IFoo and IBar<\/p>\n Now Foo class and Bar class looks like below.<\/p>\n Find and install Moq Nuget package, if you haven’t installed Moq yet. I’ll skip the explanation about who to use Nuget package. There are so many guides on this already.<\/p>\n Now, let’s test simple one first.<\/p>\n This is straightforward\u00a0mocking with Moq, if you know to use Moq.<\/p>\n See:\u00a0Moq\u00a0Quick Start<\/a><\/strong><\/p>\n Next, mock recursively to mock an interface inside an interface.<\/p>\n I initially expected Moq can create recursive mocking when setting up like\u00a0below.<\/p>\n Or,\u00a0create Bar mock first and Setup mockBar and then create Foo mock, then hopefully Moq understand what I want and provide recursive mocking like below.<\/p>\n My instinct didn’t work and the correct solution was as below.<\/p>\n A few noticeable points.<\/p>\n Use DefaultValue.Mock option, which will instantiate all properties and method by default. If not used, only methods defined by Setup will instantiate.<\/p>\n Use Mock.Get() to recursively mock Bar class and then, Setup a method with a\u00a0return value. I initially expected Moq can create recursive mocking for Bar class when<\/p>\n Actually, recursive mocking using Moq is well explained in Moq Quick Start<\/a>.<\/p>\n However, if your application, in reality, is complex, mocking can be tricky. For instance, IFoo can be an authentication API or a third-party library.<\/p>\n All test code above can be found on GitHub<\/a><\/p>\n Moq is awesome!<\/p>\n","protected":false},"excerpt":{"rendered":" Introduction When we want to mock a method that’s inside an interface which is inside another interface. This can go tricky. I’ll have a look at easy way mocking recursively using Moq. Prerequisite Moq mocking library (\u00a0Nuget package) Case There is a class having a dependency of IFoo interface, and IFoo contains IBar interface as… Continue reading Recursive mocking using Moq<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[203],"tags":[95,241,242],"class_list":["post-1041","post","type-post","status-publish","format-standard","hentry","category-library","tag-c","tag-moq","tag-unit-test","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/posts\/1041","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/comments?post=1041"}],"version-history":[{"count":4,"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/posts\/1041\/revisions"}],"predecessor-version":[{"id":1047,"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/posts\/1041\/revisions\/1047"}],"wp:attachment":[{"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/media?parent=1041"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/categories?post=1041"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/moneystock.net\/wp_e\/wp-json\/wp\/v2\/tags?post=1041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"http:\/\/www.moneystock.net\/wp_e\/wp-content\/uploads\/2017\/02\/moq2.jpg\")
<\/a><\/p>\nCase<\/h3>\n
\u00a0public class MoqTest\r\n {\r\n private IFoo _foo;\r\n\r\n public MoqTest(IFoo foo)\r\n {\r\n this._foo = foo;\r\n }\r\n\r\n public string Run(string id, string pass)\r\n {\r\n var result = _foo.Bar.DoBar(id, pass);\r\n\r\n \/\/ do something with result\r\n\r\n return result;\r\n }\r\n\r\n public string RunSimple()\r\n {\r\n var result = _foo.DoFoo();\r\n \r\n \/\/ do something with result\r\n\r\n return result;\r\n }\r\n\r\n }<\/pre>\npublic interface IFoo\r\n{\r\n IBar Bar { get; }\r\n string DoFoo();\r\n}\r\n\r\npublic interface IBar\r\n{\r\n string DoBar(string id, string pass);\r\n}<\/pre>\npublic class Foo : IFoo\r\n{\r\n private IBar _bar;\r\n\r\n public IBar Bar => _bar ?? (_bar = new Bar());\r\n\r\n public string DoFoo()\r\n {\r\n return \"Foo done\";\r\n }\r\n}\r\n\r\npublic class Bar : IBar\r\n {\r\n public string DoBar(string id, string pass)\r\n {\r\n return \"Bar done\";\r\n }\r\n}<\/pre>\n![\"\"](\"http:\/\/www.moneystock.net\/wp_e\/wp-content\/uploads\/2017\/02\/moq1.jpg\")
<\/a><\/p>\nusing Moq;\r\n\r\n[TestMethod]\r\npublic void Test_SimpleMock()\r\n{\r\n var mockFoo = new Mock<IFoo>();\r\n var test = new MoqTest.MoqTest(mockFoo.Object);\r\n var expected = \"Foo done\";\r\n var actual = test.RunSimple();\r\n Assert.AreEqual(expected, actual);\r\n}<\/pre>\nvar mockBar = new Mock<IBar>();\r\nmockFoo.Object.Bar.Object.Setup();<\/pre>\n
var mockBar = new Mock<IBar>();\r\n mockBar.Setup();\r\n var mockFoo = new Mock<IFoo>();<\/pre>\n
[TestMethod]\r\npublic void Test_RecursiveMock()\r\n{\r\n var mockFoo = new Mock<IFoo>() { DefaultValue = DefaultValue.Mock };\r\n var bar = mockFoo.Object.Bar;\r\n\r\n var barMock = Mock.Get(bar);\r\n barMock.Setup(a => a.DoBar(\"id\", \"pass\")).Returns(\"mocked\");\r\n\r\n var test = new MoqTest.MoqTest(mockFoo.Object);\r\n var expected = \"mocked\";\r\n var actual = test.Run(\"id\", \"pass\");\r\n\r\n Assert.AreEqual(expected, actual);\r\n}<\/pre>\n{ DefaultValue = DefaultValue.Mock }<\/pre>\n