}

    public static class Builder {

        private final ImmutableUniqueList.Builder<File> uniqueListBuilder;

        public Builder(int exactSize) {
            uniqueListBuilder = ImmutableUniqueList.builderWithExactSize(exactSize);
        }

        public void add(File file) {
            uniqueListBuilder.add(file);
        }

        public ClassPath build() {

			function:   "replace",
			targetSize: exactSize(3),     // e.g. abc
			argSizes:   exactSizes(0, 1), // e.g. replace "" with "_"
			expectSize: exactSize(7),     // e.g. _a_b_c_
		},
		{
			name:       "maybe replace char with empty",
			function:   "replace",
			targetSize: exactSize(3),
			argSizes:   exactSizes(1, 0),
			expectSize: checker.SizeEstimate{Min: 0, Max: 3},
		},
		{

        private final ImmutableMap.Builder<File, File> transforms;

        private Builder(int exactSize) {
            originals = DefaultClassPath.builderWithExactSize(exactSize);
            transforms = ImmutableMap.builderWithExpectedSize(exactSize);
        }

        /**
         * Adds the classpath entry with the corresponding transformed entry.
         *