Add test to cover missed branches in fs.memoryfs

Author: althonos

fs/test.py

@@ -1115,6 +1115,15 @@ def test_removetree(self):
         self.fs.removetree("foo")
         self.assert_not_exists("foo")
 
+        # Errors on files
+        self.fs.create("bar")
+        with self.assertRaises(errors.DirectoryExpected):
+            self.fs.removetree("bar")
+
+        # Errors on non-existing path
+        with self.assertRaises(errors.ResourceNotFound):
+            self.fs.removetree("foofoo")
+
     def test_setinfo(self):
         self.fs.create("birthday.txt")
         now = math.floor(time.time())

tests/test_memoryfs.py

@@ -66,3 +66,20 @@ def test_close_mem_free(self):
             "Memory usage increased after closing the file system; diff is %0.2f KiB."
             % (diff_close.size_diff / 1024.0),
         )
+
+
+class TestMemoryFile(unittest.TestCase):
+
+    def setUp(self):
+        self.fs = memoryfs.MemoryFS()
+
+    def tearDown(self):
+        self.fs.close()
+
+    def test_readline_writing(self):
+        with self.fs.openbin("test.txt", "w") as f:
+            self.assertRaises(IOError, f.readline)
+
+    def test_readinto_writing(self):
+        with self.fs.openbin("test.txt", "w") as f:
+            self.assertRaises(IOError, f.readinto, bytearray(10))