public void can_be_false() {
Execution<Boolean> exFalse = mock(Execution.class);
when(exFalse.doExecution()).thenReturn(false);
Context ctx = Context.singular(null, "dummy");
TestableValue<Boolean> wev = new TestableValue<Boolean>(exFalse, ctx, new Monitor.NULL());
TestableValue<Boolean> foo = wev.shouldBe(false);
assertEquals(false, foo.value());
foo = wev.shouldNotBe(true);