extraGroups:   []string{"system:bootstrappers:foo"},
			expectedError: false,
		},
		{
			name:          "valid: no extraGroups",
			token:         "abcdef.1234567890123456",
			usages:        []string{"signing", "authentication"},
			extraGroups:   []string{},
			expectedError: false,
		},
		{
			name:          "invalid: incorrect extraGroups",

        }
        return result
    }

    private TestFile createCacheDir(Map<String, ?> extraProps = [:]) {
        def dir = temporaryFolder.getTestDirectory()

        Map<String, Object> properties = new HashMap<String, Object>()
        properties.putAll(this.properties)
        properties.putAll(extraProps)