case cmp != -rcmp:
			return fmt.Errorf("unexpected reverse comparison %q <=> %q %v %v %v %v", item.version, prev.version, cmp, rcmp, v.Components(), rv.Components())
		}
	}

	return nil
}

func TestSemanticVersions(t *testing.T) {
	tests := []testItem{
		// This is every version string that appears in the 2.0 semver spec,
		// sorted in strictly increasing order except as noted.
		{version: "0.1.0"},
		{version: "1.0.0-0.3.7"},