Use actual git for tests and enhance Head

1 files changed, 67 insertions, 0 deletions

diff --git a/testutil_test.go b/testutil_test.go
new file mode 100644
index 00000000..bca6db14
--- /dev/null
+++ b/testutil_test.go
@@ -0,0 +1,67 @@
+package furgit
+
+import (
+	"bytes"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func setupWorkDir(t *testing.T) (string, func()) {
+	t.Helper()
+	workDir, err := os.MkdirTemp("", "furgit-work-*")
+	if err != nil {
+		t.Fatalf("failed to create work dir: %v", err)
+	}
+	return workDir, func() { _ = os.RemoveAll(workDir) }
+}
+
+func gitCmd(t *testing.T, dir string, args ...string) string {
+	t.Helper()
+	cmd := exec.Command("git", args...)
+	cmd.Dir = dir
+	cmd.Env = append(os.Environ(),
+		"GIT_CONFIG_GLOBAL=/dev/null",
+		"GIT_CONFIG_SYSTEM=/dev/null",
+		"GIT_AUTHOR_NAME=Test Author",
+		"GIT_AUTHOR_EMAIL=test@example.org",
+		"GIT_COMMITTER_NAME=Test Committer",
+		"GIT_COMMITTER_EMAIL=committer@example.org",
+		"GIT_AUTHOR_DATE=1234567890 +0000",
+		"GIT_COMMITTER_DATE=1234567890 +0000",
+	)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("git %v failed: %v\n%s", args, err, output)
+	}
+	return strings.TrimSpace(string(output))
+}
+
+func gitHashObject(t *testing.T, dir, objType string, data []byte) string {
+	t.Helper()
+	cmd := exec.Command("git", "hash-object", "-t", objType, "-w", "--stdin")
+	cmd.Dir = dir
+	cmd.Stdin = bytes.NewReader(data)
+	cmd.Env = append(os.Environ(), "GIT_CONFIG_GLOBAL=/dev/null", "GIT_CONFIG_SYSTEM=/dev/null")
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("git hash-object failed: %v\n%s", err, output)
+	}
+	return strings.TrimSpace(string(output))
+}
+
+func gitCatFile(t *testing.T, dir, objType, hash string) []byte {
+	t.Helper()
+	cmd := exec.Command("git", "cat-file", objType, hash)
+	cmd.Dir = dir
+	cmd.Env = append(os.Environ(), "GIT_CONFIG_GLOBAL=/dev/null", "GIT_CONFIG_SYSTEM=/dev/null")
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("git cat-file %s %s failed: %v\n%s", objType, hash, err, output)
+	}
+	if objType == "-t" || objType == "-s" {
+		return bytes.TrimSpace(output)
+	}
+	return output
+}