### Question:
UTF7Base64Helper { public boolean contains (final char ch) { if (ch >= 128) return false; return m_aInverseAlphabet[ch] >= 0; } UTF7Base64Helper(@Nonnull @Nonempty final String sAlphabet); int getSextet(final int ch); boolean contains(final char ch); byte getChar(final int sextet);  }### Answer:
@Test public void testContains () { assertTrue (tested.contains ('A')); assertTrue (tested.contains ('/')); assertFalse (tested.contains (',')); }