when(backingMap.putIfAbsent(eq(KEY), isA(AtomicInteger.class))).thenReturn(existingZero);
    // since the putIfAbsent returned a zero, we'll try to replace...
    when(backingMap.replace(eq(KEY), eq(existingZero), isA(AtomicInteger.class))).thenReturn(false);
    // ...and then putIfAbsent. Simulate failure on both
    when(backingMap.putIfAbsent(eq(KEY), isA(AtomicInteger.class))).thenReturn(existing);

    <_comment>ISA-Tab Investigation file</_comment>
    <magic priority="50">
      <match value="ONTOLOGY SOURCE REFERENCE" type="string" offset="0"/>
    </magic>
    <glob pattern="i_*.txt"/>
  </mime-type>

  <!--<mime-type type="application/x-isatab-study">-->
  <mime-type type="application/x-isatab">
    <_comment>ISA-Tab Study file</_comment>
    <magic priority="50">