Skip test_validate_gemspec when tarball and git installed too
git --version failed as expected when git is not installed, but unexpectedly pass when git installed and pwd is not in git working directory. So use git rev-parse instead, and it failed when git installed too.
Skip test_validate_gemspec when tarball and git installed too
git --versionfailed as expected when git is not installed,but unexpectedly pass when git installed and pwd is not in git working directory.
So use
git rev-parseinstead, and it failed when git installed too.