human
Solve the following python programming problem given the following code:
def _test_compression_warns_when_decompress_caches(self, compress) : 
    not_garbage = [] 
    control = [] 
    compress_module = globals () [compress] 
    real_decompress = compress_module.decompress 
    def decompress(ob) : 
        'mock decompress function that delegates to the real
            decompress but caches the result and a copy of the result.
            ' 
        res = real_decompress (ob) 
        not_garbage.append (res) 
        control.append (bytearray (res)) 
        return res 
rhs = { 
        np.dtype ('float64') : 1.0, 
        np.dtype ('int32') : 1, 
        np.dtype ('object') : 'a', 
        np.dtype ('datetime64[ns]') : np.timedelta64 (1, 'ns'), 
        np.dtype ('timedelta64[ns]') : np.timedelta64 (1, 'ns'), 
} 
    with patch (compress_module, 'decompress', decompress), tm.assert_produces_warning (PerformanceWarning) as ws : 
        i_rec = self.encode_decode (self.frame, compress = compress) 
        for k in self.frame.keys () : 
            value = i_rec [k] 
            expected = self.frame [k] 
            assert_frame_equal (expected, expected) 
            for block in value._data.blocks : 
                self.assertTrue (block.values.flags.writeable) 
                block.values [0] += rhs [block.dtype] 
for w in ws : 
        self.assertEqual (str (w.message), 'copying data after decompressing.
this may mean that decompress is caching its result') 
for (buf, control_buf) in zip (not_garbage, control) : 
        self.assertEqual (buf, control_buf) 

    
    

    Fix the buggy line: assert_frame_equal (expected, expected)
assistant
#Here is Python program to fix the buggy line: assert_frame_equal (expected, expected)
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assert_frame_equal (value, expected)