add more tests to increase coverage

tests/Fixtures/inc/Engine/Cache/PostSubscriber/disableCacheOnNotValidPages.php

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+<?php
+
+return [
+	'test_data' => [
+		'testIsNotInPostPage' => [
+			'config' => [
+				'is_singular' => false,
+			],
+			'can_cache' => true,
+		],
+		'testValidPostPage' => [
+			'config' => [
+				'is_singular' => true,
+				'current_post_id' => 1,
+				'current_post_link' => 'http://example.com/test1',
+				'current_page_url' => 'http://example.com/test1',
+			],
+			'can_cache' => true,
+		],
+		'testValidPostPageWithPagination' => [
+			'config' => [
+				'is_singular' => true,
+				'current_post_id' => 1,
+				'current_post_link' => 'http://example.com/test1',
+				'current_page_url' => 'http://example.com/test1/page/2',
+				'page' => 2,
+			],
+			'can_cache' => true,
+		],
+		'testEmptyPostId' => [
+			'config' => [
+				'is_singular' => true,
+				'current_post_id' => 0,
+				'current_post_link' => '',
+				'current_post_url' => 'http://example.com/test1',
+			],
+			'can_cache' => true,
+		],
+		'testNotValidPostPage' => [
+			'config' => [
+				'is_singular' => true,
+				'current_post_id' => 1,
+				'current_post_link' => 'http://example.com/test1',
+				'current_post_url' => 'http://example.com/additional-query/test1',
+			],
+			'can_cache' => false,
+		],
+		'testNotValidPostPageWithPagination' => [
+			'config' => [
+				'is_singular' => true,
+				'current_post_id' => 1,
+				'current_post_link' => 'http://example.com/test1',
+				'current_page_url' => 'http://example.com/additional-query/test1/page/2',
+				'page' => 2,
+			],
+			'can_cache' => false,
+		],
+		'testValidPostPageWithNonLatinCharactersInUrl' => [
+			'config' => [
+				'is_singular' => true,
+				'current_post_id' => 1,
+				'current_post_link' => 'http://example.com/%D0%BF%D1%80%D0%BE%D0%B4%D1%83%D0%BA%D1%82%D0%BE%D0%B2%D0%B0-%D0%BA%D0%B0%D1%82%D0%B5%D0%B3%D0%BE%D1%80%D0%B8%D1%8F/',
+				'current_page_url' => 'http://example.com/продуктова-категория/',
+			],
+			'can_cache' => true,
+		],
+	],
+];

tests/Unit/inc/Engine/Cache/PostSubscriber/disableCacheOnNotValidPages.php

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+<?php
+
+namespace WP_Rocket\Tests\Unit\inc\Engine\Cache\PostSubscriber;
+
+use Brain\Monkey\Functions;
+use WP_Rocket\Engine\Cache\PostSubscriber;
+use WP_Rocket\Tests\Unit\TestCase;
+
+/**
+ * Test class covering PostSubscriber::disable_cache_on_not_valid_pages
+ * @covers PostSubscriber::disable_cache_on_not_valid_pages
+ *
+ * @uses PostSubscriber::is_not_valid_page
+ *
+ * @group Cache
+ */
+class Test_DisableCacheOnNotValidPages extends TestCase {
+	private $subscriber;
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->subscriber = new PostSubscriber();
+	}
+
+
+	/**
+	 * @dataProvider configTestData
+	 */
+	public function testShouldReturnExpected( $config, $can_cache ) {
+		Functions\expect( 'is_singular' )->once()->andReturn( ! empty( $config['is_singular'] ) );
+		Functions\when( 'get_queried_object_id' )->justReturn( $config['current_post_id'] ?? 0 );
+
+		Functions\when( 'get_permalink' )->justReturn( $config['current_post_link'] ?? '' );
+		Functions\when( 'add_query_arg' )->justReturn( '' );
+		Functions\when( 'home_url' )->justReturn( $config['current_page_url'] ?? '' );
+		Functions\when( 'is_paged' )->justReturn( ! empty( $config['page'] ) );
+		Functions\when( 'get_query_var' )->justReturn( $config['page'] ?? 0 );
+
+		$this->assertSame( $can_cache, $this->subscriber->disable_cache_on_not_valid_pages( true ) );
+	}
+}