Update tests to create Docker client from environment

Author: humitos

tests/test_versions.py

@@ -1,5 +1,4 @@
 import pytest
-from docker import APIClient
 
 from .utils import run_command_in_container
 
@@ -90,7 +89,7 @@ def test_command_versions_image_master(command, expected_output):
         ('cargo --version', 'cargo 1.46.0 (149022b1d 2020-07-17)'),
         ('git --version', 'git version 2.17.1'),
         ('jsdoc --version', 'JSDoc 3.6.6 (Sun, 20 Sep 2020 02:25:14 GMT)'),
-        ('cat /usr/local/lib/node_modules/typedoc/package.json | grep "\"version\": "', '  "version": "0.20.20"'),
+        ('cat /usr/local/lib/node_modules/typedoc/package.json | grep -E "version.:"', '  "version": "0.20.20"'),
     ]
 )
 def test_command_versions_image_70(command, expected_output):

tests/utils.py

@@ -1,8 +1,9 @@
-from docker import APIClient
+import docker
 
 
 def run_command_in_container(container_image, command):
-    client = APIClient()
+    # CircleCI exports environment variables that ``.from_env()`` uses
+    client = docker.from_env().api
 
     # Create the container
     container = client.create_container(