testgit: Add test harnesses

1 files changed, 49 insertions, 0 deletions

diff --git a/internal/testgit/repo_run.go b/internal/testgit/repo_run.go
new file mode 100644
index 00000000..66222569
--- /dev/null
+++ b/internal/testgit/repo_run.go
@@ -0,0 +1,49 @@
+package testgit
+
+import (
+	"bytes"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+// Run executes git and returns trimmed textual output.
+func (repo *TestRepo) Run(tb testing.TB, args ...string) string {
+	tb.Helper()
+	out := repo.runBytes(tb, nil, repo.dir, args...)
+	return strings.TrimSpace(string(out))
+}
+
+// RunBytes executes git and returns raw output bytes.
+func (repo *TestRepo) RunBytes(tb testing.TB, args ...string) []byte {
+	tb.Helper()
+	return repo.runBytes(tb, nil, repo.dir, args...)
+}
+
+// RunInput executes git with stdin and returns trimmed textual output.
+func (repo *TestRepo) RunInput(tb testing.TB, stdin []byte, args ...string) string {
+	tb.Helper()
+	out := repo.runBytes(tb, stdin, repo.dir, args...)
+	return strings.TrimSpace(string(out))
+}
+
+// RunInputBytes executes git with stdin and returns raw output bytes.
+func (repo *TestRepo) RunInputBytes(tb testing.TB, stdin []byte, args ...string) []byte {
+	tb.Helper()
+	return repo.runBytes(tb, stdin, repo.dir, args...)
+}
+
+func (repo *TestRepo) runBytes(tb testing.TB, stdin []byte, dir string, args ...string) []byte {
+	tb.Helper()
+	cmd := exec.Command("git", args...)
+	cmd.Dir = dir
+	cmd.Env = repo.env
+	if stdin != nil {
+		cmd.Stdin = bytes.NewReader(stdin)
+	}
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		tb.Fatalf("git %v failed: %v\n%s", args, err, out)
+	}
+	return out
+}