General: Add phpunit tests for wp_is_numeric_array().

Adds new test class `Tests_Functions_WpIsNumericArray` for `wp_is_numeric_array()`.

Props pbearne, hareesh-pillai, hellofromTonya.
Fixes #53971.

git-svn-id: https://develop.svn.wordpress.org/trunk@52037 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/functions/wpIsNumericArray.php

@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * @group formatting
+ * @group functions.php
+ * @covers ::wp_is_numeric_array
+ */
+class Tests_Functions_WpIsNumericArray extends WP_UnitTestCase {
+
+	/**
+	 * @dataProvider data_wp_is_numeric_array
+	 *
+	 * @ticket 53971
+	 *
+	 * @param mixed $input    Input to test.
+	 * @param array $expected Expected result.
+	 */
+	function test_wp_is_numeric_array( $input, $expected ) {
+		$this->assertSame( $expected, wp_is_numeric_array( $input ) );
+	}
+
+	/**
+	 * Data provider.
+	 *
+	 * @return array[]
+	 */
+	public function data_wp_is_numeric_array() {
+		return array(
+			'no index'             => array(
+				'test_array' => array( 'www', 'eee' ),
+				'expected'   => true,
+			),
+			'text index'           => array(
+				'test_array' => array( 'www' => 'eee' ),
+				'expected'   => false,
+			),
+			'numeric index'        => array(
+				'test_array' => array( 99 => 'eee' ),
+				'expected'   => true,
+			),
+			'- numeric index'      => array(
+				'test_array' => array( -11 => 'eee' ),
+				'expected'   => true,
+			),
+			'numeric string index' => array(
+				'test_array' => array( '11' => 'eee' ),
+				'expected'   => true,
+			),
+			'nested number index'  => array(
+				'test_array' => array(
+					'next' => array(
+						11 => 'vvv',
+					),
+				),
+				'expected'   => false,
+			),
+			'nested string index'  => array(
+				'test_array' => array(
+					'11' => array(
+						'eee' => 'vvv',
+					),
+				),
+				'expected'   => true,
+			),
+			'not an array'         => array(
+				'test_array' => null,
+				'expected'   => false,
+			),
+		);
+	}
+}