Initial patch as sent to py-dev

With a small but disasterous typo fixed though.

--HG--
branch : trunk

testing/code/test_assertionnew.py

@@ -0,0 +1,74 @@
+import sys
+
+import py
+from py._code._assertionnew import interpret
+
+
+def getframe():
+    """Return the frame of the caller as a py.code.Frame object"""
+    return py.code.Frame(sys._getframe(1))
+
+
+def setup_module(mod):
+    py.code.patch_builtins(assertion=True, compile=False)
+
+
+def teardown_module(mod):
+    py.code.unpatch_builtins(assertion=True, compile=False)
+
+
+def test_assert_simple():
+    # Simply test that this way of testing works
+    a = 0
+    b = 1
+    r = interpret('assert a == b', getframe())
+    assert r == 'assert 0 == 1'
+
+
+def test_assert_list():
+    r = interpret('assert [0, 1] == [0, 2]', getframe())
+    msg = ('assert [0, 1] == [0, 2]\n'
+           '  First differing item 1: 1 != 2\n'
+           '  - [0, 1]\n'
+           '  ?     ^\n'
+           '  + [0, 2]\n'
+           '  ?     ^')
+    print r
+    assert r == msg
+
+
+def test_assert_string():
+    r = interpret('assert "foo and bar" == "foo or bar"', getframe())
+    msg = ("assert 'foo and bar' == 'foo or bar'\n"
+           "  - foo and bar\n"
+           "  ?     ^^^\n"
+           "  + foo or bar\n"
+           "  ?     ^^")
+    print r
+    assert r == msg
+
+
+def test_assert_multiline_string():
+    a = 'foo\nand bar\nbaz'
+    b = 'foo\nor bar\nbaz'
+    r = interpret('assert a == b', getframe())
+    msg = ("assert 'foo\\nand bar\\nbaz' == 'foo\\nor bar\\nbaz'\n"
+           '    foo\n'
+           '  - and bar\n'
+           '  + or bar\n'
+           '    baz')
+    print r
+    assert r == msg
+
+
+def test_assert_dict():
+    a = {'a': 0, 'b': 1}
+    b = {'a': 0, 'c': 2}
+    r = interpret('assert a == b', getframe())
+    msg = ("assert {'a': 0, 'b': 1} == {'a': 0, 'c': 2}\n"
+           "  - {'a': 0, 'b': 1}\n"
+           "  ?           ^   ^\n"
+           "  + {'a': 0, 'c': 2}\n"
+           "  ?           ^   ^")
+    print r
+    assert r == msg