diff --git a/pytest_check_mk/wrapper.py b/pytest_check_mk/wrapper.py
index c809361..e346dec 100644
--- a/pytest_check_mk/wrapper.py
+++ b/pytest_check_mk/wrapper.py
@@ -28,7 +28,6 @@ def check_info(self):
     def __getitem__(self, key):
         return CheckWrapper(self, key)
 
-
 class CheckWrapper(object):
 
     def __init__(self, check_file, name):
@@ -55,18 +54,29 @@ def has_perfdata(self):
     def service_description(self):
         return self.check_info['service_description']
 
-    def inventory(self, check_output):
+    def parse(self, info):
+        __tracebackhide__ = True
+        parse_function = self.check_info['parse_function']
+        return parse_function(info)
+
+    # inventory / check function ---------------------------------------------
+    # Normally, you can't feed the plugin output directly into a check, because
+    # the check expects the data as a list of lists + without the fist line (section).
+    # This transformation does CheckMK for you.
+    # Use this functions to test the inventory/check isolated from a monitoring core.
+
+    def inventory(self, plugin_output):
         __tracebackhide__ = True
-        section, info = parse_info(check_output.strip())
+        section, info = parse_info(plugin_output.strip())
         if section != self.section:
             raise ValueError('Wrong section name in test data: expected "{}", got "{}"'.format(self.section, section))
 
         inventory_function = self.check_info['inventory_function']
         return inventory_function(info)
 
-    def check(self, item, params, check_output):
+    def check(self, item, params, plugin_output):
         __tracebackhide__ = True
-        section, info = parse_info(check_output.strip())
+        section, info = parse_info(plugin_output.strip())
         if section != self.section:
             raise ValueError('Wrong section name in test data: expected "{}", got "{}"'.format(self.section, section))
 
@@ -74,6 +84,35 @@ def check(self, item, params, check_output):
         result = check_function(item, params, info)
         return self._convert_check_result(result)
 
+    # inventory_mk / check_mk function ---------------------------------------
+    # "_mk" = Data are coming from MK
+    # Use this functions to test the inventory/check with exactly the same data
+    # format which CheckMK hands over to the check (=list of lists).
+    # A parse_function is respected, if existing.
+
+    def inventory_mk(self, mk_output):
+        '''Use this function to test the inventory with exactly the data which
+        are handed over by the CheckMK system.'''
+        __tracebackhide__ = True
+        if "parse_function" in self.check_info:
+            parse_function = self.check_info['parse_function']
+            parsed = parse_function(mk_output)
+        else:
+            parsed = mk_output 
+        inventory_function = self.check_info['inventory_function']
+        return inventory_function(parsed)
+
+    def check_mk(self, item, params, mk_output):
+        __tracebackhide__ = True
+        if "parse_function" in self.check_info: 
+            parse_function = self.check_info['parse_function']
+            parsed = parse_function(mk_output)
+        else: 
+            parsed = mk_output
+        check_function = self.check_info['check_function']
+        result = check_function(item, params, parsed)
+        return self._convert_check_result(result)
+
     def _convert_check_result(self, result):
         __tracebackhide__ = True
         # Most of this function is taken from check_mk_base.convert_check_result,
@@ -103,9 +142,9 @@ def _convert_check_result(self, result):
             return status, ", ".join(infotexts), perfdata
 
 
-def parse_info(check_output):
+def parse_info(plugin_output):
     __tracebackhide__ = True
-    lines = check_output.splitlines(True)
+    lines = plugin_output.splitlines(True)
 
     section_name, section_options = parse_header(lines[0].strip())