Improved message when not using parametrized variable

AUTHORS

@@ -65,6 +65,7 @@ Javier Domingo Cansino
 John Towler
 Joshua Bronson
 Jurko Gospodnetić
+Justyna Janczyszyn
 Katarzyna Jachim
 Kale Kundert
 Kevin Cox

CHANGELOG.rst

@@ -146,7 +146,8 @@ time or change existing behaviors in order to make them less surprising/more use
   Thanks to `@anntzer`_ for the PR.
 
 
-*
+* Better message in case of not using parametrized variable (see `#1539`_).
+  Thanks to `@tramwaj29`_ for the PR.
 
 *
 
@@ -314,6 +315,7 @@ time or change existing behaviors in order to make them less surprising/more use
 .. _#1664: https://github.com/pytest-dev/pytest/pull/1664
 .. _#1684: https://github.com/pytest-dev/pytest/pull/1684
 .. _#1723: https://github.com/pytest-dev/pytest/pull/1723
+.. _#1539: https://github.com/pytest-dev/pytest/issues/1539
 
 .. _@DRMacIver: https://github.com/DRMacIver
 .. _@RedBeardCode: https://github.com/RedBeardCode
@@ -345,6 +347,7 @@ time or change existing behaviors in order to make them less surprising/more use
 .. _@tareqalayan: https://github.com/tareqalayan
 .. _@taschini: https://github.com/taschini
 .. _@txomon: https://github.com/txomon
+.. _@tramwaj29: https://github.com/tramwaj29
 
 2.9.2
 =====

_pytest/python.py

@@ -801,7 +801,13 @@ def parametrize(self, argnames, argvalues, indirect=False, ids=None,
         valtypes = {}
         for arg in argnames:
             if arg not in self.fixturenames:
-                raise ValueError("%r uses no fixture %r" %(self.function, arg))
+                if isinstance(indirect, (tuple, list)):
+                    name = 'fixture' if arg in indirect else 'argument'
+                else:
+                    name = 'fixture' if indirect is True else 'argument'
+                raise ValueError(
+                    "%r uses no %s %r" % (
+                            self.function, name, arg))
 
         if indirect is True:
             valtypes = dict.fromkeys(argnames, "params")
@@ -811,7 +817,7 @@ def parametrize(self, argnames, argvalues, indirect=False, ids=None,
             valtypes = dict.fromkeys(argnames, "funcargs")
             for arg in indirect:
                 if arg not in argnames:
-                    raise ValueError("indirect given to %r: fixture %r doesn't exist" %(
+                    raise ValueError("indirect given to %r: fixture %r doesn't exist" % (
                                      self.function, arg))
                 valtypes[arg] = "params"
         idfn = None

testing/python/metafunc.py

@@ -394,7 +394,7 @@ def test_simple(x):
         """)
         result = testdir.runpytest("--collect-only")
         result.stdout.fnmatch_lines([
-            "*uses no fixture 'y'*",
+            "*uses no argument 'y'*",
         ])
 
     @pytest.mark.issue714
@@ -425,7 +425,7 @@ def test_parametrize_indirect_uses_no_fixture_error_indirect_list(self, testdir)
             def x(request):
                 return request.param * 3
 
-            @pytest.mark.parametrize('x, y', [('a', 'b')], indirect=['x'])
+            @pytest.mark.parametrize('x, y', [('a', 'b')], indirect=['y'])
             def test_simple(x):
                 assert len(x) == 3
         """)
@@ -434,6 +434,23 @@ def test_simple(x):
             "*uses no fixture 'y'*",
         ])
 
+    @pytest.mark.issue714
+    def test_parametrize_argument_not_in_indirect_list(self, testdir):
+        testdir.makepyfile("""
+            import pytest
+            @pytest.fixture(scope='function')
+            def x(request):
+                return request.param * 3
+
+            @pytest.mark.parametrize('x, y', [('a', 'b')], indirect=['x'])
+            def test_simple(x):
+                assert len(x) == 3
+        """)
+        result = testdir.runpytest("--collect-only")
+        result.stdout.fnmatch_lines([
+            "*uses no argument 'y'*",
+        ])
+
     def test_addcalls_and_parametrize_indirect(self):
         def func(x, y): pass
         metafunc = self.Metafunc(func)