Merge branch 'fix_statistics' into 'master'

Fix flake8 --statistics

Closes #499

See merge request pycqa/flake8!295

src/flake8/style_guide.py

@@ -337,7 +337,7 @@ class StyleGuideManager(object):
         self.decider = decider or DecisionEngine(options)
         self.style_guides = []
         self.default_style_guide = StyleGuide(
-            options, formatter, decider=decider
+            options, formatter, self.stats, decider=decider
         )
         self.style_guides = list(
             itertools.chain(
@@ -436,14 +436,16 @@ class StyleGuideManager(object):
 class StyleGuide(object):
     """Manage a Flake8 user's style guide."""
 
-    def __init__(self, options, formatter, filename=None, decider=None):
+    def __init__(
+        self, options, formatter, stats, filename=None, decider=None
+    ):
         """Initialize our StyleGuide.
 
         .. todo:: Add parameter documentation.
         """
         self.options = options
         self.formatter = formatter
-        self.stats = statistics.Statistics()
+        self.stats = stats
         self.decider = decider or DecisionEngine(options)
         self.filename = filename
         if self.filename:
@@ -459,7 +461,9 @@ class StyleGuide(object):
         filename = filename or self.filename
         options = copy.deepcopy(self.options)
         options.ignore.extend(extend_ignore_with or [])
-        return StyleGuide(options, self.formatter, filename=filename)
+        return StyleGuide(
+            options, self.formatter, self.stats, filename=filename
+        )
 
     @contextlib.contextmanager
     def processing_file(self, filename):

tests/integration/test_main.py

@@ -6,7 +6,7 @@ from flake8.main import application
 
 
 def test_diff_option(tmpdir, capsys):
-    """Ensure that FileChecker can handle --diff."""
+    """Ensure that `flake8 --diff` works."""
     t_py_contents = '''\
 import os
 import sys  # unused but not part of diff
@@ -41,3 +41,20 @@ index d64ac39..7d943de 100644
     out, err = capsys.readouterr()
     assert out == "t.py:8:1: F821 undefined name 'y'\n"
     assert err == ''
+
+
+def test_statistics_option(tmpdir, capsys):
+    """Ensure that `flake8 --statistics` works."""
+    with tmpdir.as_cwd():
+        tmpdir.join('t.py').write('import os\nimport sys\n')
+
+        app = application.Application()
+        app.run(['--statistics', 't.py'])
+
+    out, err = capsys.readouterr()
+    assert out == '''\
+t.py:1:1: F401 'os' imported but unused
+t.py:2:1: F401 'sys' imported but unused
+2     F401 'os' imported but unused
+'''
+    assert err == ''

tests/unit/test_style_guide.py

@@ -4,6 +4,7 @@ import optparse
 import mock
 import pytest
 
+from flake8 import statistics
 from flake8 import style_guide
 from flake8 import utils
 from flake8.formatting import base
@@ -24,8 +25,11 @@ def create_options(**kwargs):
 def test_handle_error_does_not_raise_type_errors():
     """Verify that we handle our inputs better."""
     formatter = mock.create_autospec(base.BaseFormatter, instance=True)
-    guide = style_guide.StyleGuide(create_options(select=['T111'], ignore=[]),
-                                   formatter=formatter)
+    guide = style_guide.StyleGuide(
+        create_options(select=['T111'], ignore=[]),
+        formatter=formatter,
+        stats=statistics.Statistics(),
+    )
 
     assert 1 == guide.handle_error(
         'T111', 'file.py', 1, None, 'error found', 'a = 1'
@@ -60,9 +64,11 @@ def test_style_guide_applies_to(style_guide_file, filename, expected):
     """Verify that we match a file to its style guide."""
     formatter = mock.create_autospec(base.BaseFormatter, instance=True)
     options = create_options()
-    guide = style_guide.StyleGuide(options,
-                                   formatter=formatter,
-                                   filename=style_guide_file)
+    guide = style_guide.StyleGuide(
+        options,
+        formatter=formatter,
+        stats=statistics.Statistics(),
+        filename=style_guide_file)
     assert guide.applies_to(filename) is expected