Rename style_guide.Error to style_guide.Violation

Move all Violation related methods from the StyleGuide to our Violation
class.

tests/unit/test_base_formatter.py

@@ -51,7 +51,7 @@ def test_show_source_returns_nothing_when_not_showing_source():
     """Ensure we return nothing when users want nothing."""
     formatter = base.BaseFormatter(options(show_source=False))
     assert formatter.show_source(
-        style_guide.Error('A000', 'file.py', 1, 1, 'error text', 'line')
+        style_guide.Violation('A000', 'file.py', 1, 1, 'error text', 'line')
     ) is ''
 
 
@@ -59,7 +59,7 @@ def test_show_source_returns_nothing_when_there_is_source():
     """Ensure we return nothing when there is no line."""
     formatter = base.BaseFormatter(options(show_source=True))
     assert formatter.show_source(
-        style_guide.Error('A000', 'file.py', 1, 1, 'error text', None)
+        style_guide.Violation('A000', 'file.py', 1, 1, 'error text', None)
     ) is ''
 
 
@@ -71,7 +71,7 @@ def test_show_source_returns_nothing_when_there_is_source():
 def test_show_source_updates_physical_line_appropriately(line, column):
     """Ensure the error column is appropriately indicated."""
     formatter = base.BaseFormatter(options(show_source=True))
-    error = style_guide.Error('A000', 'file.py', 1, column, 'error', line)
+    error = style_guide.Violation('A000', 'file.py', 1, column, 'error', line)
     output = formatter.show_source(error)
     _, pointer = output.rsplit('\n', 1)
     assert pointer.count(' ') == (column - 1)
@@ -149,7 +149,7 @@ def test_handle_formats_the_error():
     """Verify that a formatter will call format from handle."""
     formatter = FormatFormatter(options(show_source=False))
     filemock = formatter.output_fd = mock.Mock()
-    error = style_guide.Error(
+    error = style_guide.Violation(
         code='A001',
         filename='example.py',
         line_number=1,

tests/unit/test_filenameonly_formatter.py

@@ -17,14 +17,15 @@ def test_caches_filenames_already_printed():
     formatter = default.FilenameOnly(options())
     assert formatter.filenames_already_printed == set()
 
-    formatter.format(style_guide.Error('code', 'file.py', 1, 1, 'text', 'l'))
+    formatter.format(
+        style_guide.Violation('code', 'file.py', 1, 1, 'text', 'l'))
     assert formatter.filenames_already_printed == {'file.py'}
 
 
 def test_only_returns_a_string_once_from_format():
     """Verify format ignores the second error with the same filename."""
     formatter = default.FilenameOnly(options())
-    error = style_guide.Error('code', 'file.py', 1, 1, 'text', '1')
+    error = style_guide.Violation('code', 'file.py', 1, 1, 'text', '1')
 
     assert formatter.format(error) == 'file.py'
     assert formatter.format(error) is None
@@ -33,6 +34,6 @@ def test_only_returns_a_string_once_from_format():
 def test_show_source_returns_nothing():
     """Verify show_source returns nothing."""
     formatter = default.FilenameOnly(options())
-    error = style_guide.Error('code', 'file.py', 1, 1, 'text', '1')
+    error = style_guide.Violation('code', 'file.py', 1, 1, 'text', '1')
 
     assert formatter.show_source(error) is None

tests/unit/test_nothing_formatter.py

@@ -15,7 +15,7 @@ def options(**kwargs):
 def test_format_returns_nothing():
     """Verify Nothing.format returns None."""
     formatter = default.Nothing(options())
-    error = style_guide.Error('code', 'file.py', 1, 1, 'text', '1')
+    error = style_guide.Violation('code', 'file.py', 1, 1, 'text', '1')
 
     assert formatter.format(error) is None
 
@@ -23,6 +23,6 @@ def test_format_returns_nothing():
 def test_show_source_returns_nothing():
     """Verify Nothing.show_source returns None."""
     formatter = default.Nothing(options())
-    error = style_guide.Error('code', 'file.py', 1, 1, 'text', '1')
+    error = style_guide.Violation('code', 'file.py', 1, 1, 'text', '1')
 
     assert formatter.show_source(error) is None

tests/unit/test_statistics.py

@@ -11,7 +11,7 @@ DEFAULT_TEXT = 'Default text'
 
 def make_error(**kwargs):
     """Create errors with a bunch of default values."""
-    return style_guide.Error(
+    return style_guide.Violation(
         code=kwargs.pop('code', DEFAULT_ERROR_CODE),
         filename=kwargs.pop('filename', DEFAULT_FILENAME),
         line_number=kwargs.pop('line_number', 1),

tests/unit/test_style_guide.py

@@ -19,46 +19,6 @@ def create_options(**kwargs):
     return optparse.Values(kwargs)
 
 
-@pytest.mark.parametrize('error_code,physical_line,expected_result', [
-    ('E111', 'a = 1', False),
-    ('E121', 'a = 1  # noqa: E111', False),
-    ('E121', 'a = 1  # noqa: E111,W123,F821', False),
-    ('E111', 'a = 1  # noqa: E111,W123,F821', True),
-    ('W123', 'a = 1  # noqa: E111,W123,F821', True),
-    ('E111', 'a = 1  # noqa: E11,W123,F821', True),
-    ('E111', 'a = 1  # noqa, analysis:ignore', True),
-    ('E111', 'a = 1  # noqa analysis:ignore', True),
-    ('E111', 'a = 1  # noqa - We do not care', True),
-    ('E111', 'a = 1  # noqa: We do not care', True),
-])
-def test_is_inline_ignored(error_code, physical_line, expected_result):
-    """Verify that we detect inline usage of ``# noqa``."""
-    guide = style_guide.StyleGuide(create_options(select=['E', 'W', 'F']),
-                                   listener_trie=None,
-                                   formatter=None)
-    error = style_guide.Error(error_code, 'filename.py', 1, 1, 'error text',
-                              None)
-    # We want `None` to be passed as the physical line so we actually use our
-    # monkey-patched linecache.getline value.
-
-    with mock.patch('linecache.getline', return_value=physical_line):
-        assert guide.is_inline_ignored(error) is expected_result
-
-
-def test_disable_is_inline_ignored():
-    """Verify that is_inline_ignored exits immediately if disabling NoQA."""
-    guide = style_guide.StyleGuide(create_options(disable_noqa=True),
-                                   listener_trie=None,
-                                   formatter=None)
-    error = style_guide.Error('E121', 'filename.py', 1, 1, 'error text',
-                              'line')
-
-    with mock.patch('linecache.getline') as getline:
-        assert guide.is_inline_ignored(error) is False
-
-    assert getline.called is False
-
-
 @pytest.mark.parametrize('select_list,ignore_list,error_code', [
     (['E111', 'E121'], [], 'E111'),
     (['E111', 'E121'], [], 'E121'),
@@ -76,8 +36,8 @@ def test_handle_error_notifies_listeners(select_list, ignore_list, error_code):
 
     with mock.patch('linecache.getline', return_value=''):
         guide.handle_error(error_code, 'stdin', 1, 0, 'error found')
-    error = style_guide.Error(error_code, 'stdin', 1, 1, 'error found',
-                              None)
+    error = style_guide.Violation(
+        error_code, 'stdin', 1, 1, 'error found', None)
     listener_trie.notify.assert_called_once_with(error_code, error)
     formatter.handle.assert_called_once_with(error)
 

tests/unit/test_violation.py

@@ -0,0 +1,55 @@
+"""Tests for the flake8.style_guide.Violation class."""
+import mock
+import pytest
+
+from flake8 import style_guide
+
+
+@pytest.mark.parametrize('error_code,physical_line,expected_result', [
+    ('E111', 'a = 1', False),
+    ('E121', 'a = 1  # noqa: E111', False),
+    ('E121', 'a = 1  # noqa: E111,W123,F821', False),
+    ('E111', 'a = 1  # noqa: E111,W123,F821', True),
+    ('W123', 'a = 1  # noqa: E111,W123,F821', True),
+    ('E111', 'a = 1  # noqa: E11,W123,F821', True),
+    ('E111', 'a = 1  # noqa, analysis:ignore', True),
+    ('E111', 'a = 1  # noqa analysis:ignore', True),
+    ('E111', 'a = 1  # noqa - We do not care', True),
+    ('E111', 'a = 1  # noqa: We do not care', True),
+])
+def test_is_inline_ignored(error_code, physical_line, expected_result):
+    """Verify that we detect inline usage of ``# noqa``."""
+    error = style_guide.Violation(
+        error_code, 'filename.py', 1, 1, 'error text', None)
+    # We want `None` to be passed as the physical line so we actually use our
+    # monkey-patched linecache.getline value.
+
+    with mock.patch('linecache.getline', return_value=physical_line):
+        assert error.is_inline_ignored(False) is expected_result
+
+
+def test_disable_is_inline_ignored():
+    """Verify that is_inline_ignored exits immediately if disabling NoQA."""
+    error = style_guide.Violation(
+        'E121', 'filename.py', 1, 1, 'error text', 'line')
+
+    with mock.patch('linecache.getline') as getline:
+        assert error.is_inline_ignored(True) is False
+
+    assert getline.called is False
+
+
+@pytest.mark.parametrize('violation_file,violation_line,diff,expected', [
+    ('file.py', 10, {}, True),
+    ('file.py', 1, {'file.py': range(1, 2)}, True),
+    ('file.py', 10, {'file.py': range(1, 2)}, False),
+    ('file.py', 1, {'other.py': range(1, 2)}, False),
+    ('file.py', 10, {'other.py': range(1, 2)}, False),
+])
+def test_violation_is_in_diff(violation_file, violation_line, diff, expected):
+    """Verify that we find violations within a diff."""
+    violation = style_guide.Violation(
+        'E001', violation_file, violation_line, 1, 'warning', 'line',
+    )
+
+    assert violation.is_in(diff) is expected