Tests: Add a test for markdown image sizes

Author: https://github.com/MacDue
Commit: https://github.com/SerenityOS/serenity/commit/bcf0e879d3
Pull-request: https://github.com/SerenityOS/serenity/pull/14764
Reviewed-by: https://github.com/petelliott ✅

Tests/LibMarkdown/CMakeLists.txt

@@ -2,6 +2,7 @@ include(commonmark_spec)
 
 set(TEST_SOURCES
     TestCommonmark.cpp
+    TestImageSizeExtension.cpp
 )
 
 foreach(source IN LISTS TEST_SOURCES)

Tests/LibMarkdown/TestImageSizeExtension.cpp

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Array.h>
+#include <LibMarkdown/Document.h>
+#include <LibTest/TestCase.h>
+
+struct TestCase {
+    StringView markdown;
+    StringView expected_html;
+};
+
+static constexpr Array image_size_tests {
+    // No image size:
+    TestCase { .markdown = "![](foo.png)"sv, .expected_html = R"(<p><img src="foo.png" alt="" ></p>)"sv },
+    // Only width given:
+    TestCase { .markdown = "![](foo.png =100x)"sv, .expected_html = R"(<p><img src="foo.png" style="width: 100px;" alt="" ></p>)"sv },
+    // Only height given:
+    TestCase { .markdown = "![](foo.png =x200)"sv, .expected_html = R"(<p><img src="foo.png" style="height: 200px;" alt="" ></p>)"sv },
+    // Both width and height given
+    TestCase { .markdown = "![](foo.png =50x25)"sv, .expected_html = R"(<p><img src="foo.png" style="width: 50px;height: 25px;" alt="" ></p>)"sv },
+    // Size contains invalid width
+    TestCase { .markdown = "![](foo.png =1oox50)"sv, .expected_html = R"(<p><img src="foo.png =1oox50" alt="" ></p>)"sv },
+    // Size contains invalid height
+    TestCase { .markdown = "![](foo.png =900xfour)"sv, .expected_html = R"(<p><img src="foo.png =900xfour" alt="" ></p>)"sv },
+};
+
+TEST_CASE(test_image_size_markdown_extension)
+{
+    for (auto const& test_case : image_size_tests) {
+        auto document = Markdown::Document::parse(test_case.markdown);
+        auto raw_rendered_html = document->render_to_inline_html();
+        auto rendered_html = StringView(raw_rendered_html).trim_whitespace();
+        EXPECT_EQ(rendered_html, test_case.expected_html);
+    }
+}