CheckstyleBear: Detect errors

The first commit coala/coala@9bea8fe80,
and the rewrite in 9227382, ignored ERROR from checkstyle.

Also set java files to be native EOL in .gitattributes,
to match default EOL expected by Checkstyle rule
NewlineAtEndOfFile, and force DOS EOL on AppVeyor.

Also remove `test_run` as it uses `google` by default,
which is covered in the specifically named test method.

Fixes coala#1464

.ci/appveyor.yml

@@ -51,6 +51,10 @@ install:
 build: false  # Not a C# project, build stuff at the test step instead.
 
 test_script:
+  # Force DOS format, as Checkstyle configs enable NewlineAtEndOfFile,
+  # which defaults to CRLF on Windows, and Appveyor CI ignores .gitattributes
+  # http://help.appveyor.com/discussions/problems/5687-gitattributes-changes-dont-have-any-effect
+  - unix2dos tests/java/test_files/CheckstyleGood.java
   # Clang DLLs x64 were nowadays installed, but the x64 version hangs, so we
   # exclude according tests. See https://github.com/appveyor/ci/issues/495 and
   # https://github.com/appveyor/ci/issues/688

.gitattributes

@@ -0,0 +1 @@
+*.java text eol=native

bears/java/CheckstyleBear.py

@@ -33,7 +33,7 @@ def known_checkstyle_or_path(setting):
 
 @linter(executable='java',
         output_format='regex',
-        output_regex=r'\[(?P<severity>WARN|INFO)\].*?'
+        output_regex=r'\[(?P<severity>ERROR|WARN|INFO)\].*?'
                      r'(?P<line>\d+):?(?P<column>\d+)?. '
                      r'(?P<message>.*?) *\[(?P<origin>[a-zA-Z]+?)\]')
 class CheckstyleBear:

tests/java/CheckstyleBearTest.py

@@ -24,24 +24,24 @@ def setUp(self):
         self.empty_config = os.path.join(test_files,
                                          'checkstyle_empty_config.xml')
 
-    def test_run(self):
-        self.check_validity(self.uut, [], self.good_file)
-        self.check_validity(self.uut, [], self.bad_file, valid=False)
-
     def test_style_google(self):
         self.section['checkstyle_configs'] = 'google'
         self.check_validity(self.uut, [], self.good_file)
+        self.check_validity(self.uut, [], self.bad_file, valid=False)
 
     def test_style_sun(self):
         self.section['checkstyle_configs'] = 'sun'
-        self.check_validity(self.uut, [], self.good_file)
+        self.check_validity(self.uut, [], self.good_file, valid=False)
+        self.check_validity(self.uut, [], self.bad_file, valid=False)
 
     def test_style_android(self):
         self.section['checkstyle_configs'] = 'android-check-easy'
         self.check_validity(self.uut, [], self.good_file)
+        self.check_validity(self.uut, [], self.bad_file, valid=False)
 
         self.section['checkstyle_configs'] = 'android-check-hard'
         self.check_validity(self.uut, [], self.good_file)
+        self.check_validity(self.uut, [], self.bad_file, valid=False)
 
     def test_config_failure_use_spaces(self):
         self.section['checkstyle_configs'] = 'google'