From 320625527a1372395f1117e635278050532cbbfe Mon Sep 17 00:00:00 2001
From: Gleb Nikonorov <gleb.i.nikonorov@gmail.com>
Date: Sat, 13 Jun 2020 11:22:18 -0400
Subject: [PATCH] Add more tests and docs

---
 changelog/7346.feature.rst     |  1 +
 doc/en/reference.rst           |  4 +++-
 src/_pytest/config/__init__.py |  2 +-
 testing/test_config.py         | 18 +++++++++---------
 4 files changed, 14 insertions(+), 11 deletions(-)
 create mode 100644 changelog/7346.feature.rst

diff --git a/changelog/7346.feature.rst b/changelog/7346.feature.rst
new file mode 100644
index 000000000..fef0bbb78
--- /dev/null
+++ b/changelog/7346.feature.rst
@@ -0,0 +1 @@
+Version information as defined by `PEP 440 <https://www.python.org/dev/peps/pep-0440/#version-specifiers>`_ may now be included when providing plugins to the ``required_plugins`` configuration option.
diff --git a/doc/en/reference.rst b/doc/en/reference.rst
index bf3d1fbbb..d5580ad65 100644
--- a/doc/en/reference.rst
+++ b/doc/en/reference.rst
@@ -1562,12 +1562,14 @@ passed multiple times. The expected format is ``name=value``. For example::
 .. confval:: required_plugins
 
    A space separated list of plugins that must be present for pytest to run.
+   Plugins can be listed with or without version specifiers directly following
+   their name. Whitespace between different version specifiers is not allowed.
    If any one of the plugins is not found, emit an error.
 
    .. code-block:: ini
 
        [pytest]
-       required_plugins = pytest-html pytest-xdist
+       required_plugins = pytest-django>=3.0.0,<4.0.0 pytest-html pytest-xdist>=1.0.0
 
 
 .. confval:: testpaths
diff --git a/src/_pytest/config/__init__.py b/src/_pytest/config/__init__.py
index a124b8f5f..116383a73 100644
--- a/src/_pytest/config/__init__.py
+++ b/src/_pytest/config/__init__.py
@@ -1101,7 +1101,7 @@ class Config:
         plugin_info = self.pluginmanager.list_plugin_distinfo()
         plugin_dist_info = {dist.project_name: dist.version for _, dist in plugin_info}
 
-        missing_plugins = ["a"]
+        missing_plugins = []
         for required_plugin in required_plugins:
             spec = None
             try:
diff --git a/testing/test_config.py b/testing/test_config.py
index f8c1c879e..d59d641f6 100644
--- a/testing/test_config.py
+++ b/testing/test_config.py
@@ -265,6 +265,13 @@ class TestParseIni:
             (
                 """
           [pytest]
+          required_plugins = pytest-xdist>1.0.0,<2.0.0
+          """,
+                "",
+            ),
+            (
+                """
+          [pytest]
           required_plugins = pytest-xdist~=1.32.0 pytest-xdist==1.32.0 pytest-xdist!=0.0.1 pytest-xdist<=99.99.0
             pytest-xdist>=1.32.0 pytest-xdist<9.9.9 pytest-xdist>1.30.0 pytest-xdist===1.32.0
           """,
@@ -280,16 +287,9 @@ class TestParseIni:
             (
                 """
           [pytest]
-          required_plugins = pytest-xdist==aegsrgrsgs
+          required_plugins = pytest-xdist==aegsrgrsgs pytest-xdist==-1 pytest-xdist>2.1.1,>3.0.0
           """,
-                "Missing required plugins: pytest-xdist==aegsrgrsgs",
-            ),
-            (
-                """
-          [pytest]
-          required_plugins = pytest-xdist==-1
-          """,
-                "Missing required plugins: pytest-xdist==-1",
+                "Missing required plugins: pytest-xdist==-1, pytest-xdist==aegsrgrsgs, pytest-xdist>2.1.1,>3.0.0",
             ),
             (
                 """