TST: Add test for in1d ravelling

The behavior of in1d is not really defined here, but it should
be at least consistent over different execution branches. This is
what it has been for most usages.

numpy/lib/tests/test_arraysetops.py

@@ -189,6 +189,19 @@ def test_in1d_char_array( self ):
 
         assert_array_equal(c, ec)
 
+    def test_in1d_ravel(self):
+        # Test that in1d ravels its input arrays. This is not documented
+        # behavior however. The test is to ensure consistentency.
+        a = np.arange(6).reshape(2,3)
+        b = np.arange(3,9).reshape(3,2)
+        long_b = np.arange(3, 63).reshape(30,2)
+        ec = np.array([False, False, False, True, True, True])
+
+        assert_array_equal(in1d(a, b, assume_unique=True), ec)
+        assert_array_equal(in1d(a, b, assume_unique=False), ec)
+        assert_array_equal(in1d(a, long_b, assume_unique=True), ec)
+        assert_array_equal(in1d(a, long_b, assume_unique=False), ec)
+
     def test_union1d( self ):
         a = np.array( [5, 4, 7, 1, 2] )
         b = np.array( [2, 4, 3, 3, 2, 1, 5] )