}

    @Override
    public int hashCode() {
      return ~predicate.hashCode();
    }

    @Override
    public boolean equals(@CheckForNull Object obj) {
      if (obj instanceof NotPredicate) {
        NotPredicate<?> that = (NotPredicate<?>) obj;
        return predicate.equals(that.predicate);
      }
      return false;
    }

    @Override
    public String toString() {

// Creates Object layer setup ( MakeBucket ) and then runs the PutObject benchmark.
func runPutObjectBenchmark(b *testing.B, obj ObjectLayer, objSize int) {
	var err error
	// obtains random bucket name.
	bucket := getRandomBucketName()
	// create bucket.
	err = obj.MakeBucket(context.Background(), bucket, MakeBucketOptions{})
	if err != nil {
		b.Fatal(err)
	}

        UseIterable<? extends CharSequence> obj) {
      return isSubtype(obj);
    }

    @TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)
    public UseSerializableIterable<? extends Serializable>
        implicitTypeBoundIsSubtypeOfPartialExplicitTypeBound(UseSerializableIterable<?> obj) {
      return isSubtype(obj);
    }

    final int hash;

    Element(int hash) {
      this.hash = hash;
    }

    @Override
    public boolean equals(@Nullable Object obj) {
      return this == obj || (obj instanceof Element && ((Element) obj).hash == hash);
    }

    @Override
    public int hashCode() {
      return hash;
    }

    @Override
    public int compareTo(Element that) {

        UseIterable<? extends CharSequence> obj) {
      return isSubtype(obj);
    }

    @TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)
    public UseSerializableIterable<? extends Serializable>
        implicitTypeBoundIsSubtypeOfPartialExplicitTypeBound(UseSerializableIterable<?> obj) {
      return isSubtype(obj);
    }

    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        // make sure IncludesArtifactFilter is not equal ExcludesArtifactFilter!
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }

        IncludesArtifactFilter other = (IncludesArtifactFilter) obj;

        return patterns.equals(other.patterns);
    }

    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if ((obj == null) || (getClass() != obj.getClass())) {
            return false;
        }
        final SynonymItem other = (SynonymItem) obj;

        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (!(obj instanceof OrArtifactFilter)) {
            return false;
        }

        OrArtifactFilter other = (OrArtifactFilter) obj;

        return filters.equals(other.filters);
    }

func testListObjectsOnVersionedBuckets(obj ObjectLayer, instanceType string, t1 TestErrHandler) {
	_testListObjects(obj, instanceType, t1, true)
}

// Unit test for ListObjects.
func testListObjects(obj ObjectLayer, instanceType string, t1 TestErrHandler) {
	_testListObjects(obj, instanceType, t1, false)
}

func _testListObjects(obj ObjectLayer, instanceType string, t1 TestErrHandler, versioned bool) {

		expectedError error
	}{
		// Cases with invalid bucket name.
		0: {bucketName: ".test", objName: "obj", inputData: []byte(""), expectedError: BucketNameInvalid{Bucket: ".test"}},
		1: {bucketName: "------", objName: "obj", inputData: []byte(""), expectedError: BucketNameInvalid{Bucket: "------"}},
		2: {
			bucketName: "$this-is-not-valid-too", objName: "obj", inputData: []byte(""),
			expectedError: BucketNameInvalid{Bucket: "$this-is-not-valid-too"},
		},