Fix collection error when tests is specified with --doctest-modules

The problem was that _matchnodes would receive two items: [DoctestModule, Module]. It would then collect the first one, *cache it*, and fail to match against the name in the command line. Next, it would reuse the cached item (DoctestModule) instead of collecting the Module which would eventually find the "test" name on it.

Added the type of the node to the cache key to avoid this problem, although I'm not a big fan of caches that have different key types.

Fix #3843

changelog/3843.bugfix.rst

@@ -0,0 +1 @@
+Fix collection error when specifying test functions directly in the command line using ``test.py::test`` syntax together with ``--doctest-module``.

src/_pytest/main.py

@@ -625,11 +625,12 @@ class Session(nodes.FSCollector):
                     resultnodes.append(node)
                 continue
             assert isinstance(node, nodes.Collector)
-            if node.nodeid in self._node_cache:
-                rep = self._node_cache[node.nodeid]
+            key = (type(node), node.nodeid)
+            if key in self._node_cache:
+                rep = self._node_cache[key]
             else:
                 rep = collect_one_node(node)
-                self._node_cache[node.nodeid] = rep
+                self._node_cache[key] = rep
             if rep.passed:
                 has_matched = False
                 for x in rep.result:

testing/acceptance_test.py

@@ -660,6 +660,16 @@ class TestInvocationVariants(object):
             ["*test_world.py::test_other*PASSED*", "*1 passed*"]
         )
 
+    def test_invoke_test_and_doctestmodules(self, testdir):
+        p = testdir.makepyfile(
+            """
+            def test():
+                pass
+        """
+        )
+        result = testdir.runpytest(str(p) + "::test", "--doctest-modules")
+        result.stdout.fnmatch_lines(["*1 passed*"])
+
     @pytest.mark.skipif(not hasattr(os, "symlink"), reason="requires symlinks")
     def test_cmdline_python_package_symlink(self, testdir, monkeypatch):
         """