#22 - Add isEmpty test for strings

Author: technicalguru

src/TgUtils/Utils.php

@@ -101,4 +101,15 @@ public static function findBy($list, $attr, $value) {
 		}
 		return $rc;
 	}
-}
+
+	/**
+	 * Test whether the given string is NULL or empty after trimming.
+	 * @param mixed $s - string or NULL to be tested
+	 * @return boolean TRUE when string is empty
+	 */
+	public static function isEmpty($s) {
+		if ($s == NULL) return TRUE;
+		return strlen(trim($s)) == 0;
+	}
+
+}

tests/TgUtils/UtilsTest.php

@@ -0,0 +1,31 @@
+<?php declare(strict_types=1);
+
+namespace TgUtils;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Tests some utility methods.
+ * @author ralph
+ *        
+ */
+class UtilsTest extends TestCase {
+
+    public function testIsEmptyNull(): void {
+        $this->assertTrue(Utils::isEmpty(NULL));
+    }
+    
+    public function testIsEmptyZero(): void {
+        $this->assertTrue(Utils::isEmpty(''));
+    }
+    
+    public function testIsEmptySpaces(): void {
+        $this->assertTrue(Utils::isEmpty('    '));
+    }
+    
+    public function testIsEmptyString(): void {
+        $this->assertFalse(Utils::isEmpty('a'));
+    }
+    
+}
+