}
	return s
}

// Fill buf through n writes of byte slice fub.
// The initial contents of buf corresponds to the string s;
// the result is the final contents of buf returned as a string.
func fillBytes(t *testing.T, testname string, buf *Buffer, s string, n int, fub []byte) string {
	check(t, testname+" (fill 1)", buf, s)
	for ; n > 0; n-- {
		m, err := buf.Write(fub)
		if m != len(fub) {

    @Unroll
    def "jdk #jdkVendor for #platform#suffix are downloaded and extracted"() {
        given:
        def mockRepoUrl = urlPath(jdkVendor, jdkVersion, platform, arch);
        def mockedContent = filebytes(jdkVendor, platform)
        buildFile.text = """
            plugins {
             id 'elasticsearch.jdk-download'
            }

            jdks {
              myJdk {
                vendor = '$jdkVendor'

        }

        // TODO: shouldn't have to trim, sha files should not have trailing newline
        byte[] fileBytes = Files.readAllBytes(shaFile.toPath());
        String expectedSha = new String(fileBytes, StandardCharsets.UTF_8).trim();

        String sha = getSha1(jar);

        if (expectedSha.equals(sha) == false) {