Github.com/stretchr/testify
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External
Internal
Overview
Installation
go get github.com/stretchr/testify
Programming Model
Assertions
package yours
import (
"testing"
tassert "github.com/stretchr/testify/assert"
)
func TestSomething(t *testing.T) {
assert := tassert.New(t)
// assert equality
assert.Equal(123, 123, "they should be equal")
// assert inequality
assert.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)
if assert.NotNil(object) {
// now we know that object isn't nil, we are safe to make
// further assertions without causing any errors
assert.Equal("Something", object.Value)
}
}
To check that an error has the expected message:
err := ...
assert.NotNil(err)
assert.Equal(err.Error(), "expected message")
Mocks
Mocking with Testify is based on the assumption that we want to construct mock instances to replace in testing real instances, standing in for external dependencies, defined by interfaces. '
The programming model requires to:
- define such a mock instance
- instantiate it with
new()
or&SomeInterfaceMock{}
- configure its behavior, by configuring its responses to method invocations (Testify calls this "setting up expectations")
- pass it to the code that needs to be tested
- run the code that needs to be tested
- ensure the code behave correctly, knowing that the mock returned what we instructed it to return
- optionally, "assert expectations" on the mock.
...
type MockMyService struct {
mock.Mock
}
func (m * MockMyService) Start() error {
...
}
...
mockMyService := new(MockMyService)