ℹ️ We are working on testify v2 and would love to hear what you'd like to see in it, have your say here: https://cutt.ly/testify
Go code (golang) set of packages that provide many tools for testifying that your code will behave as you intend.
Features include:
Get started:
- Install testify with one line of code, or update it with another
- For an introduction to writing test code in Go, see http://golang.org/doc/code.html#Testing
- Check out the API Documentation http://godoc.org/github.com/stretchr/testify
- To make your testing life easier, check out our other project, gorc
- A little about Test-Driven Development (TDD)
assert package
The assert package provides some helpful methods that allow you to write better test code in Go.
- Prints friendly, easy to read failure descriptions
- Allows for very readable code
- Optionally annotate each assertion with a message
See it in action:
package yours import ( "testing""github.com/stretchr/testify/assert" ) funcTestSomething(t*testing.T){// assert equalityassert.Equal(t, 123, 123, "they should be equal") // assert inequalityassert.NotEqual(t, 123, 456, "they should not be equal") // assert for nil (good for errors)assert.Nil(t, object) // assert for not nil (good when you expect something)ifassert.NotNil(t, object){// now we know that object isn't nil, we are safe to make// further assertions without causing any errorsassert.Equal(t, "Something", object.Value) } }- Every assert func takes the
testing.Tobject as the first argument. This is how it writes the errors out through the normalgo testcapabilities. - Every assert func returns a bool indicating whether the assertion was successful or not, this is useful for if you want to go on making further assertions under certain conditions.
if you assert many times, use the below:
package yours import ( "testing""github.com/stretchr/testify/assert" ) funcTestSomething(t*testing.T){assert:=assert.New(t) // assert equalityassert.Equal(123, 123, "they should be equal") // assert inequalityassert.NotEqual(123, 456, "they should not be equal") // assert for nil (good for errors)assert.Nil(object) // assert for not nil (good when you expect something)ifassert.NotNil(object){// now we know that object isn't nil, we are safe to make// further assertions without causing any errorsassert.Equal("Something", object.Value) } }require package
The require package provides same global functions as the assert package, but instead of returning a boolean result they terminate current test.
See t.FailNow for details.
mock package
The mock package provides a mechanism for easily writing mock objects that can be used in place of real objects when writing test code.
An example test function that tests a piece of code that relies on an external object testObj, can setup expectations (testify) and assert that they indeed happened:
package yours import ( "testing""github.com/stretchr/testify/mock" ) /* Test objects*/// MyMockedObject is a mocked object that implements an interface// that describes an object that the code I am testing relies on.typeMyMockedObjectstruct{mock.Mock } // DoSomething is a method on MyMockedObject that implements some interface// and just records the activity, and returns what the Mock object tells it to.//// In the real object, this method would do something useful, but since this// is a mocked object - we're just going to stub it out.//// NOTE: This method is not being tested here, code that uses this object is.func (m*MyMockedObject) DoSomething(numberint) (bool, error){args:=m.Called(number) returnargs.Bool(0), args.Error(1) } /* Actual test functions*/// TestSomething is an example of how to use our test object to// make assertions about some target code we are testing.funcTestSomething(t*testing.T){// create an instance of our test objecttestObj:=new(MyMockedObject) // setup expectationstestObj.On("DoSomething", 123).Return(true, nil) // call the code we are testingtargetFuncThatDoesSomethingWithObj(testObj) // assert that the expectations were mettestObj.AssertExpectations(t) } // TestSomethingWithPlaceholder is a second example of how to use our test object to// make assertions about some target code we are testing.// This time using a placeholder. Placeholders might be used when the// data being passed in is normally dynamically generated and cannot be// predicted beforehand (eg. containing hashes that are time sensitive)funcTestSomethingWithPlaceholder(t*testing.T){// create an instance of our test objecttestObj:=new(MyMockedObject) // setup expectations with a placeholder in the argument listtestObj.On("DoSomething", mock.Anything).Return(true, nil) // call the code we are testingtargetFuncThatDoesSomethingWithObj(testObj) // assert that the expectations were mettestObj.AssertExpectations(t) }For more information on how to write mock code, check out the API documentation for the mock package.
You can use the mockery tool to autogenerate the mock code against an interface as well, making using mocks much quicker.
suite package
The suite package provides functionality that you might be used to from more common object oriented languages. With it, you can build a testing suite as a struct, build setup/teardown methods and testing methods on your struct, and run them with 'go test' as per normal.
An example suite is shown below:
// Basic importsimport ( "testing""github.com/stretchr/testify/assert""github.com/stretchr/testify/suite" ) // Define the suite, and absorb the built-in basic suite// functionality from testify - including a T() method which// returns the current testing contexttypeExampleTestSuitestruct{suite.SuiteVariableThatShouldStartAtFiveint } // Make sure that VariableThatShouldStartAtFive is set to five// before each testfunc (suite*ExampleTestSuite) SetupTest(){suite.VariableThatShouldStartAtFive=5 } // All methods that begin with "Test" are run as tests within a// suite.func (suite*ExampleTestSuite) TestExample(){assert.Equal(suite.T(), 5, suite.VariableThatShouldStartAtFive) } // In order for 'go test' to run this suite, we need to create// a normal test function and pass our suite to suite.RunfuncTestExampleTestSuite(t*testing.T){suite.Run(t, new(ExampleTestSuite)) }For a more complete example, using all of the functionality provided by the suite package, look at our example testing suite
For more information on writing suites, check out the API documentation for the suite package.
Suite object has assertion methods:
// Basic importsimport ( "testing""github.com/stretchr/testify/suite" ) // Define the suite, and absorb the built-in basic suite// functionality from testify - including assertion methods.typeExampleTestSuitestruct{suite.SuiteVariableThatShouldStartAtFiveint } // Make sure that VariableThatShouldStartAtFive is set to five// before each testfunc (suite*ExampleTestSuite) SetupTest(){suite.VariableThatShouldStartAtFive=5 } // All methods that begin with "Test" are run as tests within a// suite.func (suite*ExampleTestSuite) TestExample(){suite.Equal(suite.VariableThatShouldStartAtFive, 5) } // In order for 'go test' to run this suite, we need to create// a normal test function and pass our suite to suite.RunfuncTestExampleTestSuite(t*testing.T){suite.Run(t, new(ExampleTestSuite)) }To install Testify, use go get:
go get github.com/stretchr/testify This will then make the following packages available to you:
github.com/stretchr/testify/assert github.com/stretchr/testify/require github.com/stretchr/testify/mock github.com/stretchr/testify/suite github.com/stretchr/testify/http (deprecated) Import the testify/assert package into your code using this template:
package yours import ( "testing""github.com/stretchr/testify/assert" ) funcTestSomething(t*testing.T){assert.True(t, true, "True is true!") }To update Testify to the latest version, use go get -u github.com/stretchr/testify.
We support the three major Go versions, which are 1.13, 1.14 and 1.15 at the moment.
Please feel free to submit issues, fork the repository and send pull requests!
When submitting an issue, we ask that you please include a complete test function that demonstrates the issue. Extra credit for those using Testify to write the test code that demonstrates it.
Code generation is used. Look for CODE GENERATED AUTOMATICALLY at the top of some files. Run go generate ./... to update generated files.
We also chat on the Gophers Slack group in the #testify and #testify-dev channels.
This project is licensed under the terms of the MIT license.