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runtime/coverage: improve unit tests

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Add a testpoint to cover support routines used to help
implement "go test -cover".

Change-Id: Ic28bf884a4e0d2c0a6d8fd04fc29c0c949227f21
Reviewed-on: https://go-review.googlesource.com/c/go/+/432315
Reviewed-by: Bryan Mills <bcmills@google.com>
This commit is contained in:
Than McIntosh 2022-09-19 14:55:09 -04:00
parent 690851ee3e
commit 9d6dc32edd
3 changed files with 73 additions and 1 deletions
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9
src/runtime/coverage/testsupport.go
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@ -13,6 +13,7 @@ import (
"internal/coverage/decodecounter"
"internal/coverage/decodemeta"
"internal/coverage/pods"
"io"
"os"
)
@ -21,6 +22,12 @@ import (
// intended to be used other than internally by the Go command's
// generated code.
func processCoverTestDir(dir string, cfile string, cm string, cpkg string) error {
return processCoverTestDirInternal(dir, cfile, cm, cpkg, os.Stdout)
}
// processCoverTestDirInternal is an io.Writer version of processCoverTestDir,
// exposed for unit testing.
func processCoverTestDirInternal(dir string, cfile string, cm string, cpkg string, w io.Writer) error {
cmode := coverage.ParseCounterMode(cm)
if cmode == coverage.CtrModeInvalid {
return fmt.Errorf("invalid counter mode %q", cm)
@ -80,7 +87,7 @@ func processCoverTestDir(dir string, cfile string, cm string, cpkg string) error
}
// Emit percent.
if err := ts.cf.EmitPercent(os.Stdout, cpkg, true); err != nil {
if err := ts.cf.EmitPercent(w, cpkg, true); err != nil {
return err
}