assertThat(ReverseTreeRepositoryListener.lookupCollectStepData(doesNotHaveIt), nullValue());

        final CollectStepData data = mock(CollectStepData.class);

        RequestTrace haveItFirst = RequestTrace.newChild(null, data)
                .newChild("foo")
                .newChild("bar")
                .newChild("baz");
        assertThat(ReverseTreeRepositoryListener.lookupCollectStepData(haveItFirst), sameInstance(data));

     * This method may return {@code null} if no collect step data found in passed trace data or it's parents.
     * <p>
     * Visible for testing.
     */
    static CollectStepData lookupCollectStepData(RequestTrace trace) {
        CollectStepData collectStepTrace = null;
        while (trace != null) {
            if (trace.getData() instanceof CollectStepData) {