add tests for empty and unset shib attributes

Author: simonLeary42

test/unit/UnitySSOTest.php

@@ -2,6 +2,7 @@
 
 namespace UnityWebPortal\lib;
 
+use UnityWebPortal\lib\exceptions\SSOException;
 use PHPUnit\Framework\TestCase;
 
 class UnitySSOTest extends TestCase
@@ -22,4 +23,28 @@ public function testMultipleAttributeValues()
             $_PREVIOUS_SERVER = $_SERVER;
         }
     }
+
+    public function testUnsetAttribute()
+    {
+        $PREVIOUS_SERVER = $_SERVER;
+        $this->expectException(SSOException::class);
+        try {
+            unset($_SERVER["REMOTE_USER"]);
+            $sso = UnitySSO::getSSO();
+        } finally {
+            $_PREVIOUS_SERVER = $_SERVER;
+        }
+    }
+
+    public function testEmptyAttribute()
+    {
+        $PREVIOUS_SERVER = $_SERVER;
+        $this->expectException(SSOException::class);
+        try {
+            $_SERVER["REMOTE_USER"] = "";
+            $sso = UnitySSO::getSSO();
+        } finally {
+            $_PREVIOUS_SERVER = $_SERVER;
+        }
+    }
 }