tests: add test for an empty file

Author: klen

tests/test_context.py

@@ -69,6 +69,12 @@ def test_context_linters_params(context):
     assert "enable" not in lparams
 
 
+def test_context_push_with_empty_file(context):
+    ctx = context(code="")
+    ctx.push(number="D100")
+    assert ctx.errors
+
+
 def test_context_does_not_change_global_options(context, parse_args):
     """Ensure a RunContext does not change the passed in options object."""
     options = parse_args(" --select=W123 --ignore=W234 --linters=pylint dummy.py")

tests/test_core.py

@@ -4,32 +4,41 @@
 def test_remove_duplicates():
     from pylama.errors import Error, remove_duplicates
 
-    errors = [Error(source='pycodestyle', text='E701'), Error(source='pylint', text='C0321')]
+    errors = [
+        Error(source="pycodestyle", text="E701"),
+        Error(source="pylint", text="C0321"),
+    ]
     errors = list(remove_duplicates(errors))
     assert len(errors) == 1
 
 
 def test_checkpath(parse_options):
     from pylama.main import check_paths
 
-    path = op.abspath('dummy.py')
+    path = op.abspath("dummy.py")
     options = parse_options([path])
     result = check_paths(None, options)
     assert result
-    assert result[0].filename == 'dummy.py'
+    assert result[0].filename == "dummy.py"
 
 
 def test_run_with_code(run, parse_options):
-    options = parse_options(linters='pyflakes')
-    errors = run('filename.py', code='unknown_call()', options=options)
+    options = parse_options(linters="pyflakes")
+    errors = run("filename.py", code="unknown_call()", options=options)
+    assert errors
+
+
+def test_run_empty_code(run, parse_options):
+    options = parse_options(linters="pyflakes")
+    errors = run("filename.py", code="", options=options)
     assert errors
 
 
 def test_async(parse_options):
     from pylama.check_async import check_async
 
     options = parse_options(config=False)
-    errors = check_async(['dummy.py'], options=options, rootdir='.')
+    errors = check_async(["dummy.py"], options=options, rootdir=".")
     assert errors