Unify patch generated step

Author: spoorcc

features/diff-in-git.feature

@@ -21,7 +21,7 @@ Feature: Diff in git
             An important sentence for the README!
             """
         When I run "dfetch diff SomeProject"
-        Then the patch file 'MyProject/SomeProject.patch' is generated with
+        Then the patch file 'MyProject/SomeProject.patch' is generated
             """
             diff --git a/README.md b/README.md
             index 1e65bd6..faa3b21 100644
@@ -40,7 +40,7 @@ Feature: Diff in git
             """
         And "SomeProject/IGNORE_ME.tmp" in MyProject is created
         When I run "dfetch diff SomeProject"
-        Then the patch file 'MyProject/SomeProject.patch' is generated with
+        Then the patch file 'MyProject/SomeProject.patch' is generated
             """
             diff --git a/NEWFILE.md b/NEWFILE.md
             new file mode 100644
@@ -65,7 +65,7 @@ Feature: Diff in git
             An important sentence for the README!
             """
         When I run "dfetch diff SomeProject"
-        Then the patch file 'MyProject/SomeProject.patch' is generated with
+        Then the patch file 'MyProject/SomeProject.patch' is generated
             """
             diff --git a/README.md b/README.md
             index 1e65bd6..faa3b21 100644

features/diff-in-svn.feature

@@ -41,7 +41,7 @@ Feature: Diff in svn
             """
         And "SomeProject/IGNORE_ME.tmp" in MySvnProject is created
         When I run "dfetch diff SomeProject" in MySvnProject
-        Then the patch file 'MySvnProject/SomeProject.patch' is generated with
+        Then the patch file 'MySvnProject/SomeProject.patch' is generated
             """
             Index: SomeProject/NEWFILE.md
             ===================================================================

features/steps/generic_steps.py

@@ -199,15 +199,12 @@ def step_impl(context, name):
 
 
 @then("the patch file '{name}' is generated")
-def step_impl(_, name):
-    """Check a manifest."""
-    check_file_exists(name)
-
-
-@then("the patch file '{name}' is generated with")
 def step_impl(context, name):
-    """Check a manifest."""
-    check_file(name, context.text)
+    """Check a patch file."""
+    if context.text:
+        check_file(name, context.text)
+    else:
+        check_file_exists(name)
 
 
 @then("the '{name}' file contains")