Added unit test shell script for twister

Author: skarg

unittest.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# Set the path to the twister executable
+TWISTER_EXE="../zephyr/scripts/twister"
+
+# Set the path to the test cases directory
+TEST_CASES_DIR="zephyr/tests"
+
+# Set the output directory for test results
+OUTPUT_DIR="twister-out.unit_testing"
+
+TWISTER_PLATFORM="unit_testing"
+
+# Remove the output directory
+rm -rf "$OUTPUT_DIR"
+
+# Run twister with the specified test cases and output directory
+"$TWISTER_EXE" -O "$OUTPUT_DIR" -p "$TWISTER_PLATFORM" -T "$TEST_CASES_DIR"
+
+# Check if twister ran successfully
+if [ $? -eq 0 ]; then
+    echo "Twister testing completed successfully."
+else
+    echo "Twister testing failed."
+    exit 1
+fi