Use shell functions in tests

tests/test_api.py

@@ -10,6 +10,7 @@
 from freezegun import freeze_time
 
 import gitman
+from gitman import shell
 from gitman.models import Config
 from gitman.exceptions import UncommittedChanges, InvalidRepository
 
@@ -283,6 +284,7 @@ def describe_list():
     def it_updates_the_log(config):
         gitman.install()
         gitman.list()
+
         with open(config.log_path) as stream:
             contents = stream.read().replace(ROOT, "/tmp").replace('\\', '/')
         expect(contents) == strip("""
@@ -337,18 +339,16 @@ def it_records_specified_dependencies(config):
 
     def it_should_fail_on_dirty_repositories(config):
         expect(gitman.update(depth=1, lock=False)) == True
-        os.remove("deps/gitman_1/.project")
+        shell.rm(os.path.join("deps", "gitman_1", ".project"))
 
         with pytest.raises(UncommittedChanges):
             gitman.lock()
 
         expect(config.__mapper__.text).does_not_contain("<dirty>")
 
     def it_should_fail_on_invalid_repositories(config):
-        if not os.path.exists("deps"):
-            os.makedirs("deps")
-        with open("deps/gitman_1", 'w') as stream:
-            stream.write("invalid repository")
+        shell.mkdir("deps")
+        shell.rm(os.path.join("deps", "gitman_1"))
 
         with pytest.raises(InvalidRepository):
             gitman.lock()