From 0996f3dbc54d5b0d096e7341cb6718ffd16da100 Mon Sep 17 00:00:00 2001
From: danielx123 <danielx@umich.edu>
Date: Mon, 22 Apr 2019 18:23:51 -0400
Subject: [PATCH] Displaying pip list command's packages and versions #5062

---
 src/_pytest/terminal.py  | 6 ++++++
 testing/test_terminal.py | 9 +++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/_pytest/terminal.py b/src/_pytest/terminal.py
index 2d7132259..98cbaa571 100644
--- a/src/_pytest/terminal.py
+++ b/src/_pytest/terminal.py
@@ -9,6 +9,7 @@ from __future__ import print_function
 import argparse
 import collections
 import platform
+import subprocess
 import sys
 import time
 from functools import partial
@@ -581,6 +582,11 @@ class TerminalReporter(object):
         ):
             msg += " -- " + str(sys.executable)
         self.write_line(msg)
+        pipe = subprocess.Popen("pip list", shell=True, stdout=subprocess.PIPE).stdout
+        package_msg = pipe.read()
+        package_msg = package_msg[:-2]
+        if package_msg:
+            self.write_line(package_msg)
         lines = self.config.hook.pytest_report_header(
             config=self.config, startdir=self.startdir
         )
diff --git a/testing/test_terminal.py b/testing/test_terminal.py
index feacc242d..bfa928d74 100644
--- a/testing/test_terminal.py
+++ b/testing/test_terminal.py
@@ -279,6 +279,15 @@ class TestTerminal(object):
         tr.rewrite("hey", erase=True)
         assert f.getvalue() == "hello" + "\r" + "hey" + (6 * " ")
 
+    def test_packages_display(self, testdir):
+        testdir.makepyfile(
+            """
+            def test_pass(num):
+                assert 1 == 1"""
+        )
+        result = testdir.runpytest()
+        result.stdout.fnmatch_lines(["*Package*", "*Version*"])
+
 
 class TestCollectonly(object):
     def test_collectonly_basic(self, testdir):