Import pytest and created some test- test scripts.

requirements.txt

@@ -5,3 +5,4 @@ enzyme>=0.4.1
 click>=6.7
 langdetect>=1.0.7
 titlecase>=0.12.0
+pytest>=5.3.5

test/test_import.py

@@ -0,0 +1,6 @@
+import sys, os
+sys.path.append(os.path.realpath(os.path.dirname(__file__)+"/../src"))
+
+def test_import_env_variables():
+  import env_variables as env 
+  assert env.logfile == 'conf/output.log'

test/test_square.py

@@ -0,0 +1,9 @@
+
+def square(x):
+  return x * x
+
+def test_square():
+  assert square(2) == 4
+
+def test_square_negative():
+  assert square(-2) == 4