Merge pull request #47 from MaksimMisin/prettier-multiline-string-diff

Better visualize differences in multiline strings

pytest_icdiff.py

@@ -76,8 +76,12 @@ def pytest_assertrepr_compare(config, op, left, right):
     half_cols = COLS / 2 - MARGINS
     TABSIZE = int(config.getoption("--icdiff-tabsize") or 2)
 
-    pretty_left = pformat(left, indent=TABSIZE, width=half_cols).splitlines()
-    pretty_right = pformat(right, indent=TABSIZE, width=half_cols).splitlines()
+    if isinstance(left, str) and isinstance(right, str):
+        pretty_left = left.splitlines()
+        pretty_right = right.splitlines()
+    else:
+        pretty_left = pformat(left, indent=TABSIZE, width=half_cols).splitlines()
+        pretty_right = pformat(right, indent=TABSIZE, width=half_cols).splitlines()
     diff_cols = COLS - MARGINS
 
     if len(pretty_left) < 3 or len(pretty_right) < 3:

tests/test_pytest_icdiff.py

@@ -229,6 +229,21 @@ def test_one():
     assert comparison_line.count("hell") < 15
 
 
+def test_mutliline_strings_have_no_escaped_newlines(testdir):
+    testdir.makepyfile(
+        r"""
+        def test_one():
+            one = "a\nb\nc\nd"
+            two = "a\nb\nc\ndd"
+            assert one == two"""
+    )
+    output = testdir.runpytest("-vv", "--color=yes").stdout.str()
+    print(repr(output))
+    assert "a" + " " * 36 in output
+    assert "b" + " " * 36 in output
+    assert "c" + " " * 36 in output
+
+
 def test_columns_are_calculated_outside_hook(testdir):
     """
     ok for some reason if you get the TerminalWriter width