Tests: Test LibMarkdown against commonmark test suite

TestCommonmark runs the CommonMark test suite
(https://spec.commonmark.org/0.30/spec.json) against LibMarkdown.
Currently 44/652 tests pass.

3 files changed, 53 insertions, 0 deletions

diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index e22f1b8e6f..6d6f35eb65 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -9,6 +9,7 @@ add_subdirectory(LibGfx)
 add_subdirectory(LibIMAP)
 add_subdirectory(LibJS)
 add_subdirectory(LibM)
+add_subdirectory(LibMarkdown)
 add_subdirectory(LibPthread)
 add_subdirectory(LibRegex)
 add_subdirectory(LibSQL)
diff --git a/Tests/LibMarkdown/CMakeLists.txt b/Tests/LibMarkdown/CMakeLists.txt
new file mode 100644
index 0000000000..a9c5d179a1
--- /dev/null
+++ b/Tests/LibMarkdown/CMakeLists.txt
@@ -0,0 +1,6 @@
+include(${SERENITY_PROJECT_ROOT}/Meta/CMake/commonmark_spec.cmake)
+file(GLOB TEST_SOURCES  CONFIGURE_DEPENDS "*.cpp")
+
+foreach(source ${TEST_SOURCES})
+    serenity_test(${source} LibMarkdown LIBS LibMarkdown)
+endforeach()
diff --git a/Tests/LibMarkdown/TestCommonmark.cpp b/Tests/LibMarkdown/TestCommonmark.cpp
new file mode 100644
index 0000000000..764d206672
--- /dev/null
+++ b/Tests/LibMarkdown/TestCommonmark.cpp
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2021, Peter Elliott <pelliott@ualberta.ca>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/JsonArray.h>
+#include <AK/JsonObject.h>
+#include <AK/JsonParser.h>
+#include <AK/String.h>
+#include <LibCore/File.h>
+#include <LibMarkdown/Document.h>
+#include <LibTest/TestCase.h>
+#include <LibTest/TestSuite.h>
+
+TEST_SETUP
+{
+    auto file = Core::File::construct("/home/anon/commonmark.spec.json");
+    if (!file->open(Core::OpenMode::ReadOnly)) {
+        file = Core::File::construct("./commonmark.spec.json");
+        VERIFY(file->open(Core::OpenMode::ReadOnly));
+    }
+
+    String test_data(file->read_all(), AK::ShouldChomp::NoChomp);
+
+    auto tests = JsonParser(test_data).parse().value().as_array();
+    for (size_t i = 0; i < tests.size(); ++i) {
+        auto testcase = tests[i].as_object();
+
+        auto name = String::formatted("{}_ex{}_{}..{}",
+            testcase.get("section"),
+            testcase.get("example"),
+            testcase.get("start_line"),
+            testcase.get("end_line"));
+
+        String markdown = testcase.get("markdown").as_string();
+        String html = testcase.get("html").as_string();
+
+        Test::TestSuite::the().add_case(adopt_ref(*new Test::TestCase(
+            name, [markdown, html]() {
+                auto document = Markdown::Document::parse(markdown);
+                EXPECT_EQ(document->render_to_inline_html(), html);
+            },
+            false)));
+    }
+}