fix: validate action input edge case

Author: kishaningithub

.github/workflows/test.yml

@@ -176,7 +176,7 @@ jobs:
           set -x
 
           if [[ "${{ steps.test-installation.outcome }}" == "success" ]]; then
-            echo "error: The action should have failed because both python-version and python-version-file were not given"
+            echo "error: The action should have failed because both python-version and python-version-file were not given but it has suceeded."
             exit 1
           else
             echo "success: The action successfully failed because both python-version and python-version-file were not given"

find-desired-python-version.sh

@@ -11,4 +11,9 @@ if [[ -z "${desired_python_version}" && -f "${specified_version_file}" ]]; then
   desired_python_version=$(cat "${specified_version_file}")
 fi
 
+if [[ -z "${desired_python_version}" ]]; then
+  echo "❌ error: Both inputs .python-version and .python-version-file are not given. Kindly provide one of them." >&2
+  exit 1
+fi
+
 echo "${desired_python_version}"