feat: add first go tests

cmd/gogitlabber/prerequisites_test.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"errors"
+	"testing"
+)
+
+// new type for the lookup function
+type lookPathFunc func(file string) (string, error)
+
+// modified function to accept a lookup function
+func verifyGitAvailableWithLookup(lookPath lookPathFunc) error {
+	_, err := lookPath("git")
+	if err != nil {
+		return errors.New("could not find git in path")
+	}
+	return nil
+}
+
+func TestVerifyGitAvailable(t *testing.T) {
+
+	// test case 1: git is available
+	err := verifyGitAvailableWithLookup(func(file string) (string, error) {
+		return "/usr/bin/git", nil
+	})
+	if err != nil {
+		t.Errorf("Expected no error when git is available, got: %v", err)
+	}
+
+	// test case 2: git is not available
+	err = verifyGitAvailableWithLookup(func(file string) (string, error) {
+		return "", errors.New("git not found")
+	})
+	if err == nil {
+		t.Error("Expected error when git is not available, got nil")
+	}
+}