FormattingFunctionsHelper::is_formatting_function(): add tests

WordPress/Tests/Helpers/FormattingFunctionsHelper/IsFormattingFunctionUnitTest.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * WordPress Coding Standard.
+ *
+ * @package WPCS\WordPressCodingStandards
+ * @link    https://github.com/WordPress/WordPress-Coding-Standards
+ * @license https://opensource.org/licenses/MIT MIT
+ */
+
+namespace WordPressCS\WordPress\Tests\Helpers\FormattingFunctionsHelper;
+
+use PHPUnit\Framework\TestCase;
+use WordPressCS\WordPress\Helpers\FormattingFunctionsHelper;
+
+/**
+ * Tests for the `FormattingFunctionsHelper::is_formatting_function()` method.
+ *
+ * @since 3.4.0
+ *
+ * @covers \WordPressCS\WordPress\Helpers\FormattingFunctionsHelper::is_formatting_function
+ */
+final class IsFormattingFunctionUnitTest extends TestCase {
+
+	/**
+	 * Test is_formatting_function().
+	 *
+	 * @dataProvider dataIsFormattingFunction
+	 *
+	 * @param string $functionName   The function name to test.
+	 * @param bool   $expectedResult The expected return value.
+	 *
+	 * @return void
+	 */
+	public function testIsFormattingFunction( $functionName, $expectedResult ) {
+		$this->assertSame(
+			$expectedResult,
+			FormattingFunctionsHelper::is_formatting_function( $functionName )
+		);
+	}
+
+	/**
+	 * Data provider.
+	 *
+	 * @see testIsFormattingFunction()
+	 *
+	 * @return array<string, array<string, bool|string>>
+	 */
+	public static function dataIsFormattingFunction() {
+		return array(
+			'lowercase_name'            => array(
+				'functionName'   => 'sprintf',
+				'expectedResult' => true,
+			),
+			'mixedcase_name'            => array(
+				'functionName'   => 'iMpLoDe',
+				'expectedResult' => true,
+			),
+			'not_a_formatting_function' => array(
+				'functionName'   => 'printf',
+				'expectedResult' => false,
+			),
+		);
+	}
+}