title: How to reassign value from mockStore.overrideSelector()?
body: <p>I have a selector that returns a boolean. For my unit test I need to test when this value is true and false.</p>
  <p>By default, in the test setup, I have the following:</p>
  <pre><code>mockStore.overrideSelector(someSelector, true);
  </code></pre>
  <p>I need to change the value from the selector to false, however when I try the following:</p>
  <pre><code>mockStore.resetSelectors();
  mockStore.overrideSelector(someSelector, false);
  mockStore.refreshState();
  spectator.detectChanges();
  </code></pre>
  <p>The selector is still returning true.</p>
  <p>How can I reassign a value previously set from overrideSelector method?</p>