At some point we’re likely to require a mocking framework for our unit test code. Ofcourse there’s several java based frameworks. In this post I’m going to look into using JMock.<\/p>\n
Setting up an example<\/strong><\/p>\n Let’s start by looking at an interface, my old favourite a Calculator <\/p>\n Let’s now add some dependencies to the pom.xml<\/p>\n Using JMock<\/strong><\/p>\n We need to start off by creating a Mockery<\/em> object. This will be used to create the mocks as well as handle the three A’s, Arrange, Act and Assert. Let’s jump straight in an look at some code…<\/p>\n In the code above we’re creating the Mockery<\/em> in the setup<\/em> method and the assert in the teardown<\/em>.<\/p>\n We then use the Mockery<\/em> to create a mock of the interface Calculator which we would normally pass into some other class to use, but for simplicity I’ve simply demonstrated how we arrange the mock using mockery.checking<\/em> along with the expectations. Then we act on the mock object by calling the add<\/em> method which ofcourse will execute our arrange code.<\/p>\n Here’s an example of some code which demonstrates arranging values which will return a different value each time, so we’ll add the following to our Calculator interface<\/p>\n and now create the following test, which expects random<\/em> to be called three times and arranges each return accordingly.<\/p>\n Ofcourse there’s plenty more to JMock, but this should get you started.<\/p>\n","protected":false},"excerpt":{"rendered":" At some point we’re likely to require a mocking framework for our unit test code. Ofcourse there’s several java based frameworks. In this post I’m going to look into using JMock. Setting up an example Let’s start by looking at an interface, my old favourite a Calculator public interface Calculator { double add(double a, double […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[161,213],"tags":[],"class_list":["post-5843","post","type-post","status-publish","format-standard","hentry","category-java","category-jmock"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts\/5843","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/comments?post=5843"}],"version-history":[{"count":4,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts\/5843\/revisions"}],"predecessor-version":[{"id":6174,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts\/5843\/revisions\/6174"}],"wp:attachment":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/media?parent=5843"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/categories?post=5843"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/tags?post=5843"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\r\npublic interface Calculator {\r\n double add(double a, double b);\r\n}\r\n<\/pre>\n\r\n<dependencies>\r\n <dependency>\r\n <groupId>junit<\/groupId>\r\n <artifactId>junit<\/artifactId>\r\n <version>4.12<\/version>\r\n <scope>test<\/scope>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.jmock<\/groupId>\r\n <artifactId>jmock-junit4<\/artifactId>\r\n <version>2.8.4<\/version>\r\n <scope>test<\/scope>\r\n <\/dependency>\r\n<\/dependencies>\r\n<\/pre>\n
\r\npackage com.putridparrot;\r\n\r\nimport org.jmock.Expectations;\r\nimport org.jmock.Mockery;\r\nimport org.junit.After;\r\nimport org.junit.Before;\r\nimport org.junit.Test;\r\n\r\nimport static org.junit.Assert.assertEquals;\r\n\r\npublic class CalculatorTest {\r\n\r\n private Mockery mockery;\r\n\r\n @Before\r\n public void setUp() {\r\n mockery = new Mockery();\r\n }\r\n\r\n @After\r\n public void tearDown() {\r\n mockery.assertIsSatisfied();\r\n }\r\n\r\n @Test\r\n public void add() {\r\n\r\n final Calculator calc = mockery.mock(Calculator.class);\r\n\r\n mockery.checking(new Expectations()\r\n {\r\n {\r\n oneOf(calc).add(2.0, 4.0);\r\n will(returnValue(6.0));\r\n }\r\n });\r\n\r\n double result = calc.add(2, 4);\r\n assertEquals(6.0, result, 0);\r\n }\r\n}\r\n<\/pre>\n\r\nint random();\r\n<\/pre>\n
\r\n@Test\r\npublic void random() {\r\n final Calculator calc = mockery.mock(Calculator.class);\r\n\r\n mockery.checking(new Expectations()\r\n {\r\n {\r\n exactly(3)\r\n .of(calc)\r\n .random();\r\n\r\n will(onConsecutiveCalls(\r\n returnValue(4),\r\n returnValue(10),\r\n returnValue(42)\r\n ));\r\n }\r\n });\r\n\r\n assertEquals(4, calc.random());\r\n assertEquals(10, calc.random());\r\n assertEquals(42, calc.random());\r\n}\r\n<\/pre>\n