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package convey
import (
"fmt"
"github.com/jtolds/gls"
"github.com/smartystreets/goconvey/convey/reporting"
)
type conveyErr struct {
fmt string
params []interface{}
}
func (e *conveyErr) Error() string {
return fmt.Sprintf(e.fmt, e.params...)
}
func conveyPanic(fmt string, params ...interface{}) {
panic(&conveyErr{fmt, params})
}
const (
missingGoTest = `Top-level calls to Convey(...) need a reference to the *testing.T.
Hint: Convey("description here", t, func() { /* notice that the second argument was the *testing.T (t)! */ }) `
extraGoTest = `Only the top-level call to Convey(...) needs a reference to the *testing.T.`
noStackContext = "Convey operation made without context on goroutine stack.\n" +
"Hint: Perhaps you meant to use `Convey(..., func(c C){...})` ?"
differentConveySituations = "Different set of Convey statements on subsequent pass!\nDid not expect %#v."
multipleIdenticalConvey = "Multiple convey suites with identical names: %#v"
)
const (
failureHalt = "___FAILURE_HALT___"
nodeKey = "node"
)
///////////////////////////////// Stack Context /////////////////////////////////
func getCurrentContext() *context {
ctx, ok := ctxMgr.GetValue(nodeKey)
if ok {
return ctx.(*context)
}
return nil
}
func mustGetCurrentContext() *context {
ctx := getCurrentContext()
if ctx == nil {
conveyPanic(noStackContext)
}
return ctx
}
//////////////////////////////////// Context ////////////////////////////////////
// context magically handles all coordination of Convey's and So assertions.
//
// It is tracked on the stack as goroutine-local-storage with the gls package,
// or explicitly if the user decides to call convey like:
//
// Convey(..., func(c C) {
// c.So(...)
// })
//
// This implements the `C` interface.
type context struct {
reporter reporting.Reporter
children map[string]*context
resets []func()
executedOnce bool
expectChildRun *bool
complete bool
focus bool
failureMode FailureMode
}
// rootConvey is the main entry point to a test suite. This is called when
// there's no context in the stack already, and items must contain a `t` object,
// or this panics.
func rootConvey(items ...interface{}) {
entry := discover(items)
if entry.Test == nil {
conveyPanic(missingGoTest)
}
expectChildRun := true
ctx := &context{
reporter: buildReporter(),
children: make(map[string]*context),
expectChildRun: &expectChildRun,
focus: entry.Focus,
failureMode: defaultFailureMode.combine(entry.FailMode),
}
ctxMgr.SetValues(gls.Values{nodeKey: ctx}, func() {
ctx.reporter.BeginStory(reporting.NewStoryReport(entry.Test))
defer ctx.reporter.EndStory()
for ctx.shouldVisit() {
ctx.conveyInner(entry.Situation, entry.Func)
expectChildRun = true
}
})
}
//////////////////////////////////// Methods ////////////////////////////////////
func (ctx *context) SkipConvey(items ...interface{}) {
ctx.Convey(items, skipConvey)
}
func (ctx *context) FocusConvey(items ...interface{}) {
ctx.Convey(items, focusConvey)
}
func (ctx *context) Convey(items ...interface{}) {
entry := discover(items)
// we're a branch, or leaf (on the wind)
if entry.Test != nil {
conveyPanic(extraGoTest)
}
if ctx.focus && !entry.Focus {
return
}
var inner_ctx *context
if ctx.executedOnce {
var ok bool
inner_ctx, ok = ctx.children[entry.Situation]
if !ok {
conveyPanic(differentConveySituations, entry.Situation)
}
} else {
if _, ok := ctx.children[entry.Situation]; ok {
conveyPanic(multipleIdenticalConvey, entry.Situation)
}
inner_ctx = &context{
reporter: ctx.reporter,
children: make(map[string]*context),
expectChildRun: ctx.expectChildRun,
focus: entry.Focus,
failureMode: ctx.failureMode.combine(entry.FailMode),
}
ctx.children[entry.Situation] = inner_ctx
}
if inner_ctx.shouldVisit() {
ctxMgr.SetValues(gls.Values{nodeKey: inner_ctx}, func() {
inner_ctx.conveyInner(entry.Situation, entry.Func)
})
}
}
func (ctx *context) SkipSo(stuff ...interface{}) {
ctx.assertionReport(reporting.NewSkipReport())
}
func (ctx *context) So(actual interface{}, assert assertion, expected ...interface{}) {
if result := assert(actual, expected...); result == assertionSuccess {
ctx.assertionReport(reporting.NewSuccessReport())
} else {
ctx.assertionReport(reporting.NewFailureReport(result))
}
}
func (ctx *context) Reset(action func()) {
/* TODO: Failure mode configuration */
ctx.resets = append(ctx.resets, action)
}
func (ctx *context) Print(items ...interface{}) (int, error) {
fmt.Fprint(ctx.reporter, items...)
return fmt.Print(items...)
}
func (ctx *context) Println(items ...interface{}) (int, error) {
fmt.Fprintln(ctx.reporter, items...)
return fmt.Println(items...)
}
func (ctx *context) Printf(format string, items ...interface{}) (int, error) {
fmt.Fprintf(ctx.reporter, format, items...)
return fmt.Printf(format, items...)
}
//////////////////////////////////// Private ////////////////////////////////////
// shouldVisit returns true iff we should traverse down into a Convey. Note
// that just because we don't traverse a Convey this time, doesn't mean that
// we may not traverse it on a subsequent pass.
func (c *context) shouldVisit() bool {
return !c.complete && *c.expectChildRun
}
// conveyInner is the function which actually executes the user's anonymous test
// function body. At this point, Convey or RootConvey has decided that this
// function should actually run.
func (ctx *context) conveyInner(situation string, f func(C)) {
// Record/Reset state for next time.
defer func() {
ctx.executedOnce = true
// This is only needed at the leaves, but there's no harm in also setting it
// when returning from branch Convey's
*ctx.expectChildRun = false
}()
// Set up+tear down our scope for the reporter
ctx.reporter.Enter(reporting.NewScopeReport(situation))
defer ctx.reporter.Exit()
// Recover from any panics in f, and assign the `complete` status for this
// node of the tree.
defer func() {
ctx.complete = true
if problem := recover(); problem != nil {
if problem, ok := problem.(*conveyErr); ok {
panic(problem)
}
if problem != failureHalt {
ctx.reporter.Report(reporting.NewErrorReport(problem))
}
} else {
for _, child := range ctx.children {
if !child.complete {
ctx.complete = false
return
}
}
}
}()
// Resets are registered as the `f` function executes, so nil them here.
// All resets are run in registration order (FIFO).
ctx.resets = []func(){}
defer func() {
for _, r := range ctx.resets {
// panics handled by the previous defer
r()
}
}()
if f == nil {
// if f is nil, this was either a Convey(..., nil), or a SkipConvey
ctx.reporter.Report(reporting.NewSkipReport())
} else {
f(ctx)
}
}
// assertionReport is a helper for So and SkipSo which makes the report and
// then possibly panics, depending on the current context's failureMode.
func (ctx *context) assertionReport(r *reporting.AssertionResult) {
ctx.reporter.Report(r)
if r.Failure != "" && ctx.failureMode == FailureHalts {
panic(failureHalt)
}
}
