Merge pull request #26840 from woocommerce/test/template-cache-clearing

add template cache unit test

tests/legacy/unit-tests/core/template-cache.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * Template cache tests class.
+ *
+ * @package WooCommerce\Tests\Core
+ */
+
+/**
+ * WC_Template_Cache class.
+ */
+class WC_Template_Cache extends WC_Unit_Test_Case {
+	/**
+	 * Test wc_get_template_part().
+	 */
+	public function test_wc_get_template_part() {
+		// Clear cache to start.
+		$this->clear_template_cache();
+
+		// Prevent template being loaded.
+		add_filter( 'wc_get_template_part', '__return_false' );
+		// Use content-* templates.
+		$templates = array();
+		foreach ( glob( dirname( WC_PLUGIN_FILE ) . '/templates/content*.php' ) as $template ) {
+			$name                    = preg_replace( '|content-(.*)\.php|', '$1', basename( $template ) );
+			$cache_key               = sanitize_key(
+				implode(
+					'-',
+					array(
+						'template-part',
+						'content',
+						$name,
+						WC_VERSION,
+					)
+				)
+			);
+			$templates[ $cache_key ] = $template;
+			wc_get_template_part( 'content', $name );
+		}
+		remove_filter( 'wc_get_template_part', '__return_false' );
+
+		// Check cached template list.
+		$this->assertEquals( array_keys( $templates ), wp_cache_get( 'cached_templates', 'woocommerce' ) );
+
+		// Check individual templates.
+		foreach ( $templates as $cache_key => $template ) {
+			$this->assertEquals( $template, wp_cache_get( $cache_key, 'woocommerce' ) );
+		}
+
+		// Clear cache.
+		$this->clear_template_cache();
+	}
+
+	/**
+	 * Clear the template cache.
+	 */
+	protected function clear_template_cache() {
+		$cached_templates = wp_cache_get( 'cached_templates', 'woocommerce' );
+		wc_clear_template_cache();
+
+		foreach ( (array) $cached_templates as $template ) {
+			$this->assertEmpty( wp_cache_get( $template, 'woocommerce' ) );
+		}
+		$this->assertEmpty( wp_cache_get( 'cached_templates', 'woocommerce' ) );
+	}
+}