public CasesBuilder<I, O> withActualOutputConsumer(final Consumer<String> actualOutputConsumer) {
            this.actualOutputConsumer = actualOutputConsumer;
            return this;
        }
A pre-canned simple test action that just asserts that the actual output is equal to
the expected output.
If the {@link TestCase} includes an expected {@link Throwable} type then any exceptions will
be intercepted and asserted automatically. The consumer will not be called if an exception is
expected.
stroom-test-common/src/main/java/stroom/test/common/DynamicTestBuilder.java