Add tests for :config-write-py

tests/unit/config/test_configcommands.py

@@ -345,6 +345,55 @@ class TestEdit:
         assert msg.text == expected
 
 
+class TestWritePy:
+
+    """Tests for :config-write-py."""
+
+    def test_custom(self, commands, config_stub, keyconf, tmpdir):
+        confpy = tmpdir / 'config.py'
+        config_stub.val.content.javascript.enabled = True
+        keyconf.bind(',x', 'message-info foo', mode='normal')
+
+        commands.config_write_py(str(confpy))
+
+        lines = confpy.read_text('utf-8').splitlines()
+        assert "c.content.javascript.enabled = True" in lines
+        assert "config.bind(',x', 'message-info foo')" in lines
+
+    def test_defaults(self, commands, tmpdir):
+        confpy = tmpdir / 'config.py'
+        commands.config_write_py(str(confpy), defaults=True)
+
+        lines = confpy.read_text('utf-8').splitlines()
+        assert "# c.content.javascript.enabled = True" in lines
+        assert "# config.bind('H', 'back')" in lines
+
+    def test_default_location(self, commands, config_tmpdir):
+        confpy = config_tmpdir / 'config.py'
+        commands.config_write_py()
+        lines = confpy.read_text('utf-8').splitlines()
+        assert '# Autogenerated config.py' in lines
+
+    def test_existing_file(self, commands, tmpdir):
+        confpy = tmpdir / 'config.py'
+        confpy.ensure()
+
+        with pytest.raises(cmdexc.CommandError) as excinfo:
+            commands.config_write_py(str(confpy))
+
+        expected = " already exists - use --force to overwrite!"
+        assert str(excinfo.value).endswith(expected)
+
+    def test_existing_file_force(self, commands, tmpdir):
+        confpy = tmpdir / 'config.py'
+        confpy.ensure()
+
+        commands.config_write_py(str(confpy), force=True)
+
+        lines = confpy.read_text('utf-8').splitlines()
+        assert '# Autogenerated config.py' in lines
+
+
 class TestBind:
 
     """Tests for :bind and :unbind."""