this.versionDir = versionDir
    }

    TestFile getBinDistribution() {
        downloadIfNecessary()
        super.getBinDistribution()
    }

    TestFile getGradleHomeDir() {
        downloadIfNecessary()
        super.getGradleHomeDir()
    }

    private downloadIfNecessary() {
        def distributionZip = super.getBinDistribution()
        def gradleHomeDir = super.getGradleHomeDir()

    }

    @Nullable
    public TestFile getNormalizedBinDistribution() {
        return optionalFile("integTest.normalizedDistribution");
    }

    @Nullable
    public TestFile getBinDistribution() {
        return optionalFile("integTest.binDistribution");
    }

    @Nullable
    public TestFile getAllDistribution() {
        return optionalFile("integTest.allDistribution");
    }

    /**
     * Returns the root directory of the installed distribution
     */
    TestFile getGradleHomeDir();

    /**
     * Returns the binary distribution.
     */
    TestFile getBinDistribution();

    /**
     * Returns the version of this distribution.
     */
    GradleVersion getVersion();

    /**
     * Creates an executer which will use this distribution.
     */

    @Override
    String toString() {
        return version.toString();
    }

    @Override
    TestFile getGradleHomeDir() {
        return gradleHomeDir;
    }

    @Override
    TestFile getBinDistribution() {
        return binDistribution;
    }

    @Override
    GradleVersion getVersion() {
        return version;
    }

    @Override