@Test
  public void testMark_unsupported() throws IOException {
    JimfsInputStream in = newInputStream(1, 2, 3);
    assertThat(in.markSupported()).isFalse();

    // mark does nothing
    in.mark(1);

    try {
      // reset throws IOException when unsupported
      in.reset();
      fail();
    } catch (IOException expected) {
    }
  }
Tests for {@link JimfsInputStream}.

@author Colin Decker
jimfs/src/test/java/com/google/common/jimfs/JimfsInputStreamTest.java