Add initial tests for image rendering (#66010)

- Add initial tests for image rendering

Co-authored-by: SantosGuillamot <[email protected]>
Co-authored-by: cbravobernal <[email protected]>

phpunit/blocks/render-block-image-test.php

@@ -0,0 +1,62 @@
+<?php
+/**
+ * Image block rendering tests.
+ *
+ * @package WordPress
+ * @subpackage Blocks
+ */
+
+/**
+ * Tests for the Image block.
+ *
+ * @group blocks
+ */
+class Tests_Blocks_Render_Image extends WP_UnitTestCase {
+	/**
+	 * @covers ::render_block_core_image
+	 */
+	public function test_should_render_block_core_image_when_src_is_defined() {
+		$attributes    = array();
+		$content       = '<figure class="wp-block-image"><img src="http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/2021/04/canola.jpg" aria-label="test render"/></figure>';
+		$parsed_blocks = parse_blocks(
+			'<!-- wp:image -->'
+		);
+		$parsed_block  = $parsed_blocks[0];
+		$block         = new WP_Block( $parsed_block );
+
+		$rendered_block = gutenberg_render_block_core_image( $attributes, $content, $block );
+		$this->assertStringContainsString( 'aria-label="test render"', $rendered_block );
+	}
+
+	/**
+	 * @covers ::render_block_core_image
+	 */
+	public function test_should_not_render_block_core_image_when_src_is_not_defined() {
+		$attributes    = array();
+		$content       = '<figure class="wp-block-image"><img /></figure>';
+		$parsed_blocks = parse_blocks(
+			'<!-- wp:image -->'
+		);
+		$parsed_block  = $parsed_blocks[0];
+		$block         = new WP_Block( $parsed_block );
+
+		$rendered_block = gutenberg_render_block_core_image( $attributes, $content, $block );
+		$this->assertEquals( '', $rendered_block );
+	}
+
+	/**
+	 * @covers ::render_block_core_image
+	 */
+	public function test_should_not_render_block_core_image_when_src_is_empty_string() {
+		$attributes    = array();
+		$content       = '<figure class="wp-block-image"><img src=""/></figure>';
+		$parsed_blocks = parse_blocks(
+			'<!-- wp:image -->'
+		);
+		$parsed_block  = $parsed_blocks[0];
+		$block         = new WP_Block( $parsed_block );
+
+		$rendered_block = gutenberg_render_block_core_image( $attributes, $content, $block );
+		$this->assertEquals( '', $rendered_block );
+	}
+}