Add test code for RustClippy.

bears/rust/RustClippyLintBear.py

@@ -1,6 +1,6 @@
 import json
+import shutil
 from os import linesep
-from shutil import which
 
 from coalib.bears.GlobalBear import GlobalBear
 from coalib.misc.Shell import run_shell_command
@@ -32,7 +32,7 @@ class RustClippyLintBear(GlobalBear):
     def check_prerequisites(cls):
         # TODO: - check for clippy itself
         #       - clippy also works via rustup nightly, so also check that.
-        if which('cargo') is None:
+        if shutil.which('cargo') is None:
             return 'cargo is not installed.'
         else:
             return True

tests/rust/.gitignore

@@ -0,0 +1,2 @@
+target
+Cargo.lock

tests/rust/RustClippyLintBearTest.py

@@ -0,0 +1,50 @@
+import unittest
+import shutil
+import os
+from queue import Queue
+from textwrap import dedent
+from contextlib import ExitStack, contextmanager
+from shutil import which
+from unittest.case import skipIf
+
+from coala_utils.ContextManagers import prepare_file
+from coalib.settings.Section import Section
+
+from bears.rust.RustClippyLintBear import RustClippyLintBear
+
+
+@skipIf(which('cargo') is None, 'Cargo is not installed')
+class RustClippyLintBearTest(unittest.TestCase):
+
+    def setUp(self):
+        self.section = Section('name')
+        self.queue = Queue()
+        self.file_dict = {}
+        self.uut = RustClippyLintBear(self.file_dict, self.section, self.queue)
+
+    def change_directory(self, directory_name):
+        test_path = os.path.abspath(os.path.join(os.path.dirname(__file__),
+                                                 directory_name))
+        os.chdir(test_path)
+
+    def test_prerequisites(self):
+        _shutil_which = shutil.which
+        try:
+            shutil.which = lambda *args, **kwargs: None
+            self.assertEqual(RustClippyLintBear.check_prerequisites(),
+                             'cargo is not installed.')
+
+            shutil.which = lambda *args, **kwargs: 'path/to/git'
+            self.assertTrue(RustClippyLintBear.check_prerequisites())
+        finally:
+            shutil.which = _shutil_which
+
+    def test_ok_source(self):
+        self.change_directory('test_ok')
+        results = list(self.uut.run())
+        self.assertTrue(len(results) == 0)
+
+    def test_bad_source(self):
+        self.change_directory('test_bad')
+        results = list(self.uut.run())
+        self.assertTrue(len(results) >= 2)

tests/rust/test_bad/Cargo.toml

@@ -0,0 +1,5 @@
+[package]
+name = "coala_test_files"
+version = "0.1.0"
+
+[dependencies]

tests/rust/test_ok/Cargo.toml

@@ -0,0 +1,5 @@
+[package]
+name = "coala_test_files"
+version = "0.1.0"
+
+[dependencies]