Create Makefile and update message in test

Author: Coniferish

.genignore

@@ -2,3 +2,6 @@
 
 # ignore human-written test files
 tests/test_utils_retries.py
+
+# ignore Makefile
+Makefile

Makefile

@@ -0,0 +1,19 @@
+PACKAGE_NAME := unstructured-python-client
+CURRENT_DIR := $(shell pwd)
+ARCH := $(shell uname -m)
+
+###########
+# Install #
+###########
+
+test-install:
+	pip install requests_mock
+
+#################
+# Test and Lint #
+#################
+
+.PHONY: test
+test:
+	PYTHONPATH=. pytest \
+		tests

tests/test_utils_retries.py

@@ -11,7 +11,8 @@
 def get_api_key():
     api_key = os.getenv("UNS_API_KEY")
     if api_key is None:
-        raise ValueError("UNS_API_KEY environment variable not set")
+        raise ValueError("""UNS_API_KEY environment variable not set. 
+Set it in your current shell session with `export UNS_API_KEY=<api_key>`""")
     return api_key
 
 # this test requires UNS_API_KEY be set in your shell session. Ex: `export UNS_API_KEY=<api_key>`