Build, Test Tools: Test PHP and WP compatibility functions.

Introduce tests for `is_php_version_compatible()` and `is_wp_version_compatible()`.

Props pbearne, hellofromTonya, mikeschroder, peterwilsoncc, toro_unit.
Fixes #54257.


git-svn-id: https://develop.svn.wordpress.org/trunk@53227 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/functions/isPhpVersionCompatible.php

@@ -0,0 +1,53 @@
+<?php
+
+/**
+ * Tests the is_php_version_compatible function.
+ *
+ * @group functions.php
+ * @covers ::is_php_version_compatible
+ */
+class Tests_Functions_isPhpVersionCompatible extends WP_UnitTestCase {
+	/**
+	 * Tests is_php_version_compatible().
+	 *
+	 * @dataProvider data_is_php_version_compatible
+	 *
+	 * @param mixed $test_value
+	 * @param bool $expected
+	 *
+	 * @ticket 54257
+	 */
+	public function test_is_php_version_compatible( $test_value, $expected ) {
+		$this->assertSame( is_php_version_compatible( $test_value ), $expected );
+	}
+
+	/**
+	 * Provides test scenarios for test_php_version_compatible.
+	 *
+	 * @return array
+	 */
+	function data_is_php_version_compatible() {
+		$php_version = phpversion();
+
+		$more = explode( '.', $php_version );
+		$less = $more;
+
+		-- $less[ count( $less ) - 1 ];
+		++ $more[ count( $less ) - 1 ];
+
+		return array(
+			'greater' => array(
+				'test_value' => implode( '.', $more ),
+				'expected'   => false,
+			),
+			'same'    => array(
+				'test_value' => $php_version,
+				'expected'   => true,
+			),
+			'less'    => array(
+				'test_value' => implode( '.', $less ),
+				'expected'   => true,
+			),
+		);
+	}
+}

tests/phpunit/tests/functions/isWpVersionCompatible.php

@@ -0,0 +1,53 @@
+<?php
+
+/**
+ * Tests the is_php_version_compatible function.
+ *
+ * @group functions.php
+ * @covers ::is_wp_version_compatible
+ */
+class Tests_Functions_isWpVersionCompatible extends WP_UnitTestCase {
+	/**
+	 * Test is_wp_version_compatible().
+	 *
+	 * @dataProvider data_is_wp_version_compatible
+	 *
+	 * @param mixed $test_value
+	 * @param bool $expected
+	 *
+	 * @ticket 54257
+	 */
+	public function test_is_wp_version_compatible( $test_value, $expected ) {
+		$this->assertSame( is_wp_version_compatible( $test_value ), $expected );
+	}
+
+	/**
+	 * Provides test scenarios test_is_wp_version_compatible.
+	 *
+	 * @return array
+	 */
+	function data_is_wp_version_compatible() {
+		$wp_version = get_bloginfo( 'version' );
+
+		$more = explode( '.', $wp_version );
+		$less = $more;
+
+		-- $less[0];
+		++ $more[0];
+
+		return array(
+			'greater' => array(
+				'test_value' => implode( '.', $more ),
+				'expected'   => false,
+			),
+			'same'    => array(
+				'test_value' => $wp_version,
+				'expected'   => true,
+			),
+			'less'    => array(
+				'test_value' => implode( '.', $less ),
+				'expected'   => true,
+			),
+		);
+	}
+}