add skills command scaffold

internal/skills/gitclient/gitclient_test.go

@@ -0,0 +1,49 @@
+package gitclient
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type mockResolver struct {
+	root string
+	err  error
+}
+
+func (m *mockResolver) ToplevelDir() (string, error) {
+	if m.err != nil {
+		return "", m.err
+	}
+	return m.root, nil
+}
+
+func TestResolveGitRoot(t *testing.T) {
+	t.Run("returns root on success", func(t *testing.T) {
+		got := ResolveGitRoot(&mockResolver{root: "/my/repo"})
+		assert.Equal(t, "/my/repo", got)
+	})
+
+	t.Run("falls back to cwd on error", func(t *testing.T) {
+		got := ResolveGitRoot(&mockResolver{err: fmt.Errorf("not a git repo")})
+		assert.NotEmpty(t, got) // falls back to cwd
+	})
+
+	t.Run("nil resolver falls back to cwd", func(t *testing.T) {
+		got := ResolveGitRoot(nil)
+		assert.NotEmpty(t, got) // falls back to cwd
+	})
+}
+
+func TestResolveHomeDir(t *testing.T) {
+	got := ResolveHomeDir()
+	assert.NotEmpty(t, got)
+}
+
+func TestTruncateSHA(t *testing.T) {
+	assert.Equal(t, "abcdef12", TruncateSHA("abcdef1234567890"))
+	assert.Equal(t, "short", TruncateSHA("short"))
+	assert.Equal(t, "12345678", TruncateSHA("12345678"))
+	assert.Equal(t, "", TruncateSHA(""))
+}