313 lines
11 KiB
Go
313 lines
11 KiB
Go
/*
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Package assert provides assertions for comparing expected values to actual
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values in tests. When an assertion fails a helpful error message is printed.
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# Example usage
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All the assertions in this package use testing.T.Helper to mark themselves as
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test helpers. This allows the testing package to print the filename and line
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number of the file function that failed.
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assert.NilError(t, err)
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// filename_test.go:212: assertion failed: error is not nil: file not found
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If any assertion is called from a helper function, make sure to call t.Helper
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from the helper function so that the filename and line number remain correct.
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The examples below show assert used with some common types and the failure
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messages it produces. The filename and line number portion of the failure
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message is omitted from these examples for brevity.
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// booleans
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assert.Assert(t, ok)
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// assertion failed: ok is false
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assert.Assert(t, !missing)
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// assertion failed: missing is true
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// primitives
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assert.Equal(t, count, 1)
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// assertion failed: 0 (count int) != 1 (int)
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assert.Equal(t, msg, "the message")
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// assertion failed: my message (msg string) != the message (string)
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assert.Assert(t, total != 10) // use Assert for NotEqual
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// assertion failed: total is 10
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assert.Assert(t, count > 20, "count=%v", count)
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// assertion failed: count is <= 20: count=1
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// errors
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assert.NilError(t, closer.Close())
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// assertion failed: error is not nil: close /file: errno 11
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assert.Error(t, err, "the exact error message")
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// assertion failed: expected error "the exact error message", got "oops"
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assert.ErrorContains(t, err, "includes this")
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// assertion failed: expected error to contain "includes this", got "oops"
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assert.ErrorIs(t, err, os.ErrNotExist)
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// assertion failed: error is "oops", not "file does not exist" (os.ErrNotExist)
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// complex types
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assert.DeepEqual(t, result, myStruct{Name: "title"})
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// assertion failed: ... (diff of the two structs)
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assert.Assert(t, is.Len(items, 3))
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// assertion failed: expected [] (length 0) to have length 3
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assert.Assert(t, len(sequence) != 0) // use Assert for NotEmpty
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// assertion failed: len(sequence) is 0
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assert.Assert(t, is.Contains(mapping, "key"))
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// assertion failed: map[other:1] does not contain key
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// pointers and interface
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assert.Assert(t, ref == nil)
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// assertion failed: ref is not nil
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assert.Assert(t, ref != nil) // use Assert for NotNil
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// assertion failed: ref is nil
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# Assert and Check
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Assert and Check are very similar, they both accept a Comparison, and fail
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the test when the comparison fails. The one difference is that Assert uses
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testing.T.FailNow to fail the test, which will end the test execution immediately.
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Check uses testing.T.Fail to fail the test, which allows it to return the
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result of the comparison, then proceed with the rest of the test case.
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Like testing.T.FailNow, Assert must be called from the goroutine running the test,
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not from other goroutines created during the test. Check is safe to use from any
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goroutine.
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# Comparisons
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Package http://pkg.go.dev/gotest.tools/v3/assert/cmp provides
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many common comparisons. Additional comparisons can be written to compare
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values in other ways. See the example Assert (CustomComparison).
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# Automated migration from testify
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gty-migrate-from-testify is a command which translates Go source code from
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testify assertions to the assertions provided by this package.
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See http://pkg.go.dev/gotest.tools/v3/assert/cmd/gty-migrate-from-testify.
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*/
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package assert // import "gotest.tools/v3/assert"
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import (
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gocmp "github.com/google/go-cmp/cmp"
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"gotest.tools/v3/assert/cmp"
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"gotest.tools/v3/internal/assert"
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)
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// BoolOrComparison can be a bool, cmp.Comparison, or error. See Assert for
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// details about how this type is used.
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type BoolOrComparison interface{}
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// TestingT is the subset of testing.T used by the assert package.
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type TestingT interface {
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FailNow()
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Fail()
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Log(args ...interface{})
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}
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type helperT interface {
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Helper()
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}
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// Assert performs a comparison. If the comparison fails, the test is marked as
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// failed, a failure message is logged, and execution is stopped immediately.
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//
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// The comparison argument may be one of three types:
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//
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// bool
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// True is success. False is a failure. The failure message will contain
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// the literal source code of the expression.
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//
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// cmp.Comparison
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// Uses cmp.Result.Success() to check for success or failure.
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// The comparison is responsible for producing a helpful failure message.
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// http://pkg.go.dev/gotest.tools/v3/assert/cmp provides many common comparisons.
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//
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// error
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// A nil value is considered success, and a non-nil error is a failure.
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// The return value of error.Error is used as the failure message.
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//
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// Extra details can be added to the failure message using msgAndArgs. msgAndArgs
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// may be either a single string, or a format string and args that will be
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// passed to fmt.Sprintf.
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//
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// Assert uses t.FailNow to fail the test. Like t.FailNow, Assert must be called
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// from the goroutine running the test function, not from other
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// goroutines created during the test. Use Check from other goroutines.
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func Assert(t TestingT, comparison BoolOrComparison, msgAndArgs ...interface{}) {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !assert.Eval(t, assert.ArgsFromComparisonCall, comparison, msgAndArgs...) {
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t.FailNow()
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}
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}
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// Check performs a comparison. If the comparison fails the test is marked as
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// failed, a failure message is printed, and Check returns false. If the comparison
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// is successful Check returns true. Check may be called from any goroutine.
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//
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// See Assert for details about the comparison arg and failure messages.
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func Check(t TestingT, comparison BoolOrComparison, msgAndArgs ...interface{}) bool {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !assert.Eval(t, assert.ArgsFromComparisonCall, comparison, msgAndArgs...) {
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t.Fail()
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return false
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}
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return true
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}
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// NilError fails the test immediately if err is not nil, and includes err.Error
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// in the failure message.
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//
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// NilError uses t.FailNow to fail the test. Like t.FailNow, NilError must be
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// called from the goroutine running the test function, not from other
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// goroutines created during the test. Use Check from other goroutines.
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func NilError(t TestingT, err error, msgAndArgs ...interface{}) {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !assert.Eval(t, assert.ArgsAfterT, err, msgAndArgs...) {
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t.FailNow()
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}
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}
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// Equal uses the == operator to assert two values are equal and fails the test
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// if they are not equal.
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//
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// If the comparison fails Equal will use the variable names and types of
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// x and y as part of the failure message to identify the actual and expected
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// values.
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//
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// assert.Equal(t, actual, expected)
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// // main_test.go:41: assertion failed: 1 (actual int) != 21 (expected int32)
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//
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// If either x or y are a multi-line string the failure message will include a
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// unified diff of the two values. If the values only differ by whitespace
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// the unified diff will be augmented by replacing whitespace characters with
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// visible characters to identify the whitespace difference.
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//
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// Equal uses t.FailNow to fail the test. Like t.FailNow, Equal must be
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// called from the goroutine running the test function, not from other
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// goroutines created during the test. Use Check with cmp.Equal from other
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// goroutines.
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func Equal(t TestingT, x, y interface{}, msgAndArgs ...interface{}) {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !assert.Eval(t, assert.ArgsAfterT, cmp.Equal(x, y), msgAndArgs...) {
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t.FailNow()
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}
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}
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// DeepEqual uses google/go-cmp (https://godoc.org/github.com/google/go-cmp/cmp)
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// to assert two values are equal and fails the test if they are not equal.
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//
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// Package http://pkg.go.dev/gotest.tools/v3/assert/opt provides some additional
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// commonly used Options.
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//
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// DeepEqual uses t.FailNow to fail the test. Like t.FailNow, DeepEqual must be
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// called from the goroutine running the test function, not from other
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// goroutines created during the test. Use Check with cmp.DeepEqual from other
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// goroutines.
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func DeepEqual(t TestingT, x, y interface{}, opts ...gocmp.Option) {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !assert.Eval(t, assert.ArgsAfterT, cmp.DeepEqual(x, y, opts...)) {
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t.FailNow()
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}
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}
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// Error fails the test if err is nil, or if err.Error is not equal to expected.
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// Both err.Error and expected will be included in the failure message.
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// Error performs an exact match of the error text. Use ErrorContains if only
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// part of the error message is relevant. Use ErrorType or ErrorIs to compare
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// errors by type.
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//
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// Error uses t.FailNow to fail the test. Like t.FailNow, Error must be
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// called from the goroutine running the test function, not from other
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// goroutines created during the test. Use Check with cmp.Error from other
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// goroutines.
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func Error(t TestingT, err error, expected string, msgAndArgs ...interface{}) {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !assert.Eval(t, assert.ArgsAfterT, cmp.Error(err, expected), msgAndArgs...) {
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t.FailNow()
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}
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}
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// ErrorContains fails the test if err is nil, or if err.Error does not
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// contain the expected substring. Both err.Error and the expected substring
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// will be included in the failure message.
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//
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// ErrorContains uses t.FailNow to fail the test. Like t.FailNow, ErrorContains
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// must be called from the goroutine running the test function, not from other
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// goroutines created during the test. Use Check with cmp.ErrorContains from other
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// goroutines.
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func ErrorContains(t TestingT, err error, substring string, msgAndArgs ...interface{}) {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !assert.Eval(t, assert.ArgsAfterT, cmp.ErrorContains(err, substring), msgAndArgs...) {
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t.FailNow()
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}
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}
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// ErrorType fails the test if err is nil, or err is not the expected type.
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// Most new code should use ErrorIs instead. ErrorType may be deprecated in the
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// future.
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//
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// Expected can be one of:
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//
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// func(error) bool
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// The function should return true if the error is the expected type.
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//
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// struct{} or *struct{}
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// A struct or a pointer to a struct. The assertion fails if the error is
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// not of the same type.
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//
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// *interface{}
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// A pointer to an interface type. The assertion fails if err does not
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// implement the interface.
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//
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// reflect.Type
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// The assertion fails if err does not implement the reflect.Type.
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//
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// ErrorType uses t.FailNow to fail the test. Like t.FailNow, ErrorType
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// must be called from the goroutine running the test function, not from other
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// goroutines created during the test. Use Check with cmp.ErrorType from other
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// goroutines.
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func ErrorType(t TestingT, err error, expected interface{}, msgAndArgs ...interface{}) {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !assert.Eval(t, assert.ArgsAfterT, cmp.ErrorType(err, expected), msgAndArgs...) {
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t.FailNow()
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}
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}
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// ErrorIs fails the test if err is nil, or the error does not match expected
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// when compared using errors.Is. See https://golang.org/pkg/errors/#Is for
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// accepted arguments.
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//
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// ErrorIs uses t.FailNow to fail the test. Like t.FailNow, ErrorIs
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// must be called from the goroutine running the test function, not from other
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// goroutines created during the test. Use Check with cmp.ErrorIs from other
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// goroutines.
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func ErrorIs(t TestingT, err error, expected error, msgAndArgs ...interface{}) {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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if !assert.Eval(t, assert.ArgsAfterT, cmp.ErrorIs(err, expected), msgAndArgs...) {
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t.FailNow()
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}
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}
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