tests: Add testcase for OrderedDict equality.

There's a need for .exp file because CPython renders OrderedDict's as:

OrderedDict([('b', 2)])

while MicroPython as:

OrderedDict({'b': 2})

tests/basics/ordereddict_eq.py

@@ -0,0 +1,44 @@
+try:
+    from collections import OrderedDict
+except ImportError:
+    try:
+        from ucollections import OrderedDict
+    except ImportError:
+        print("SKIP")
+        import sys
+        sys.exit()
+
+x = OrderedDict()
+y = OrderedDict()
+x['a'] = 1
+x['b'] = 2
+y['a'] = 1
+y['b'] = 2
+print(x)
+print(y)
+print(x == y)
+
+z = OrderedDict()
+z['b'] = 2
+z['a'] = 1
+print(y)
+print(z)
+print(y == z)
+
+del z['b']
+z['b'] = 2
+print(y)
+print(z)
+print(y == z)
+
+del x['a']
+del y['a']
+print(x)
+print(y)
+print(x == y)
+
+del z['b']
+del y['b']
+print(y)
+print(z)
+print(y == z)

tests/basics/ordereddict_eq.py.exp

@@ -0,0 +1,15 @@
+OrderedDict({'a': 1, 'b': 2})
+OrderedDict({'a': 1, 'b': 2})
+True
+OrderedDict({'a': 1, 'b': 2})
+OrderedDict({'b': 2, 'a': 1})
+False
+OrderedDict({'a': 1, 'b': 2})
+OrderedDict({'a': 1, 'b': 2})
+True
+OrderedDict({'b': 2})
+OrderedDict({'b': 2})
+True
+OrderedDict({})
+OrderedDict({'a': 1})
+False