Function runGitTest

internal/diff/git_test.go:16–23

runGitTest runs a git command in dir and fails the test on error.

(t *testing.T, dir string, args ...string)

// runGitTest runs a git command in dir and fails the test on error.
func runGitTest(t *testing.T, dir string, args ...string) {
	t.Helper()
	cmd := exec.Command("git", args...)
	cmd.Dir = dir
	if out, err := cmd.CombinedOutput(); err != nil {
		t.Fatalf("git %v failed: %v\n%s", args, err, out)
	}
}

// writeGarbageExternalDiff writes a shell script that emits non-diff output and
// returns its path. When git invokes it via GIT_EXTERNAL_DIFF / diff.external it