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100 lines
3.7 KiB
Go
100 lines
3.7 KiB
Go
// Package assertions contains the implementations for all assertions which
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// are referenced in goconvey's `convey` package
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// (github.com/smartystreets/goconvey/convey) for use with the So(...) method.
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// They can also be used in traditional Go test functions and even in
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// applicaitons.
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package assertions
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import (
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"fmt"
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"runtime"
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)
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// By default we use a no-op serializer. The actual Serializer provides a JSON
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// representation of failure results on selected assertions so the goconvey
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// web UI can display a convenient diff.
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var serializer Serializer = new(noopSerializer)
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// GoConveyMode provides control over JSON serialization of failures. When
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// using the assertions in this package from the convey package JSON results
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// are very helpful and can be rendered in a DIFF view. In that case, this function
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// will be called with a true value to enable the JSON serialization. By default,
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// the assertions in this package will not serializer a JSON result, making
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// standalone ussage more convenient.
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func GoConveyMode(yes bool) {
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if yes {
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serializer = newSerializer()
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} else {
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serializer = new(noopSerializer)
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}
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}
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type testingT interface {
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Error(args ...interface{})
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}
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type Assertion struct {
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t testingT
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failed bool
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}
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// New swallows the *testing.T struct and prints failed assertions using t.Error.
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// Example: assertions.New(t).So(1, should.Equal, 1)
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func New(t testingT) *Assertion {
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return &Assertion{t: t}
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}
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// Failed reports whether any calls to So (on this Assertion instance) have failed.
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func (this *Assertion) Failed() bool {
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return this.failed
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}
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// So calls the standalone So function and additionally, calls t.Error in failure scenarios.
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func (this *Assertion) So(actual interface{}, assert assertion, expected ...interface{}) bool {
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ok, result := So(actual, assert, expected...)
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if !ok {
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this.failed = true
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_, file, line, _ := runtime.Caller(1)
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this.t.Error(fmt.Sprintf("\n%s:%d\n%s", file, line, result))
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}
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return ok
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}
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// So is a convenience function (as opposed to an inconvenience function?)
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// for running assertions on arbitrary arguments in any context, be it for testing or even
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// application logging. It allows you to perform assertion-like behavior (and get nicely
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// formatted messages detailing discrepancies) but without the program blowing up or panicking.
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// All that is required is to import this package and call `So` with one of the assertions
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// exported by this package as the second parameter.
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// The first return parameter is a boolean indicating if the assertion was true. The second
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// return parameter is the well-formatted message showing why an assertion was incorrect, or
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// blank if the assertion was correct.
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//
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// Example:
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//
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// if ok, message := So(x, ShouldBeGreaterThan, y); !ok {
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// log.Println(message)
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// }
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//
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func So(actual interface{}, assert assertion, expected ...interface{}) (bool, string) {
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if result := so(actual, assert, expected...); len(result) == 0 {
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return true, result
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} else {
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return false, result
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}
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}
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// so is like So, except that it only returns the string message, which is blank if the
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// assertion passed. Used to facilitate testing.
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func so(actual interface{}, assert func(interface{}, ...interface{}) string, expected ...interface{}) string {
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return assert(actual, expected...)
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}
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// assertion is an alias for a function with a signature that the So()
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// function can handle. Any future or custom assertions should conform to this
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// method signature. The return value should be an empty string if the assertion
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// passes and a well-formed failure message if not.
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type assertion func(actual interface{}, expected ...interface{}) string
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////////////////////////////////////////////////////////////////////////////
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