Strip invocation-scope suffix when displaying fixture lookup error

_pytest/fixtures.py

@@ -615,6 +615,16 @@ def scopemismatch(currentscope, newscope):
     return scopes.index(newscope) > scopes.index(currentscope)
 
 
+def strip_invocation_scope_suffix(name):
+    """Remove the invocation-scope suffix from the given name.
+
+    Invocation scope fixtures have their scope in the name of the fixture.
+    For example, "monkeypatch:session". This function strips the suffix
+    returning the user-frienldy name of the fixture.
+    """
+    return name.split(':')[0]
+
+
 class FixtureLookupError(LookupError):
     """ could not return a requested Fixture (missing or invalid). """
     def __init__(self, argname, request, msg=None):
@@ -654,7 +664,8 @@ class FixtureLookupError(LookupError):
             parentid = self.request._pyfuncitem.parent.nodeid
             for name, fixturedefs in fm._arg2fixturedefs.items():
                 faclist = list(fm._matchfactories(fixturedefs, parentid))
-                if faclist:
+                name = strip_invocation_scope_suffix(name)
+                if faclist and name not in available:
                     available.append(name)
             msg = "fixture %r not found" % (self.argname,)
             msg += "\n available fixtures: %s" %(", ".join(available),)

_pytest/python.py

@@ -1006,6 +1006,7 @@ def showfixtures(config):
 
 def _showfixtures_main(config, session):
     import _pytest.config
+    from _pytest.fixtures import strip_invocation_scope_suffix
     session.perform_collect()
     curdir = py.path.local()
     tw = _pytest.config.create_terminal_writer(config)
@@ -1022,11 +1023,9 @@ def _showfixtures_main(config, session):
             continue
         for fixturedef in fixturedefs:
             loc = getlocation(fixturedef.func, curdir)
-            fixture_argname = fixturedef.argname
             # invocation-scoped fixtures have argname in the form
             # "<name>:<scope>" (for example: "monkeypatch:session").
-            if ':' in fixture_argname:
+            fixture_argname = strip_invocation_scope_suffix(fixturedef.argname)
-                fixture_argname = fixture_argname.split(':')[0]
             if (fixture_argname, loc) in seen:
                 continue
             seen.add((fixture_argname, loc))

testing/python/fixture.py

@@ -417,6 +417,7 @@ class TestFillFixtures:
             "*1 error*",
         ])
         assert "INTERNAL" not in result.stdout.str()
+        assert 'monkeypatch:session' not in result.stdout.str()
 
     def test_fixture_excinfo_leak(self, testdir):
         # on python2 sys.excinfo would leak into fixture executions