diff --git a/README.md b/README.md
index d0ed8d4..bbc164c 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Install the package
 pip install az.cli
 ```
 
-Login using `az login`, see [sign in using a service principal](https://docs.microsoft.com/en-us/cli/azure/create-an-azure-service-principal-azure-cli?view=azure-cli-latest#sign-in-using-a-service-principalt).
+Login using `az login` or [sign in using a service principal](https://docs.microsoft.com/en-us/cli/azure/create-an-azure-service-principal-azure-cli?view=azure-cli-latest#sign-in-using-a-service-principalt).
 
 Under the hood the package uses the [~/.azure](https://github.com/Azure/azure-cli/blob/dev/src/azure-cli-core/azure/cli/core/_environment.py) folder to persist and retrieve config.
 
diff --git a/src/az/cli.py b/src/az/cli.py
index 31a161b..26b2489 100644
--- a/src/az/cli.py
+++ b/src/az/cli.py
@@ -5,7 +5,6 @@
 # Based on https://github.com/Azure/azure-cli/blob/dev/src/azure-cli-core/azure/cli/core/__init__.py
 # commit 8e369b9d2d63ddf5c6678ee710905bf9e5028f99
 # --------------------------------------------------------------------------------------------
-
 import sys
 from io import StringIO
 import json
@@ -16,8 +15,6 @@
 from azure.cli.core import get_default_cli
 from knack.log import CLI_LOGGER_NAME
 
-# Create default shell to run commands
-_cli = get_default_cli()
 
 AzResult = namedtuple('AzResult', ['exit_code', 'result_dict', 'log'])
 
@@ -59,6 +56,9 @@ def az(command):
     :return: a named tuple consisting of exit_code, out and log
     """
 
+    # Create default shell to run commands
+    _cli = get_default_cli()
+
     # Create string buffer to get the result and logs
     stdout_buf = StringIO()
     log_buf = StringIO()
diff --git a/tests/az_test.py b/tests/az_test.py
index 1ceb6ef..079096e 100644
--- a/tests/az_test.py
+++ b/tests/az_test.py
@@ -10,8 +10,9 @@
 
 def test_az(az_login):
     error_code, result_dict, log = az(AZ_SUCCESSFUL_COMMAND)
-    assert error_code == 0
     assert log == ""
+    assert error_code == 0
+    
 
 
 def test_az_failure(az_login):