LibTest + test-js: Add initial skelaton of LibTest and migrate code there.

The test-js reporter is arguably the nicest test runner / reporter that
exists in the serenity code base. To the goal of leveling up all the
other unit test environments, start a new LibTest library so that we
can share code and reporting utilities to make all the test systems
look and behave similarly.

4 files changed, 90 insertions, 50 deletions

diff --git a/Userland/Libraries/CMakeLists.txt b/Userland/Libraries/CMakeLists.txt
index 54e35f3191..15b9fb3226 100644
--- a/Userland/Libraries/CMakeLists.txt
+++ b/Userland/Libraries/CMakeLists.txt
@@ -30,6 +30,7 @@ add_subdirectory(LibSymbolClient)
 add_subdirectory(LibSyntax)
 add_subdirectory(LibSystem)
 add_subdirectory(LibTar)
+add_subdirectory(LibTest)
 add_subdirectory(LibTextCodec)
 add_subdirectory(LibThread)
 add_subdirectory(LibTLS)
diff --git a/Userland/Libraries/LibTest/CMakeLists.txt b/Userland/Libraries/LibTest/CMakeLists.txt
new file mode 100644
index 0000000000..954409d28c
--- /dev/null
+++ b/Userland/Libraries/LibTest/CMakeLists.txt
@@ -0,0 +1,2 @@
+
+serenity_install_sources(Libraries/LibTest)
diff --git a/Userland/Libraries/LibTest/Results.h b/Userland/Libraries/LibTest/Results.h
new file mode 100644
index 0000000000..6fb36c9602
--- /dev/null
+++ b/Userland/Libraries/LibTest/Results.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
+ * Copyright (c) 2021, Brian Gianforcaro <b.gianfo@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/String.h>
+#include <AK/Vector.h>
+
+namespace Test {
+
+enum class Result {
+    Pass,
+    Fail,
+    Skip,
+};
+
+struct Case {
+    String name;
+    Result result;
+    String details;
+};
+
+struct Suite {
+    String name;
+    // A failed test takes precedence over a skipped test, which both have
+    // precedence over a passed test
+    Result most_severe_test_result { Result::Pass };
+    Vector<Case> tests {};
+};
+
+}
diff --git a/Userland/Utilities/test-js.cpp b/Userland/Utilities/test-js.cpp
index f5f8489c6e..33d1885d82 100644
--- a/Userland/Utilities/test-js.cpp
+++ b/Userland/Utilities/test-js.cpp
@@ -40,6 +40,7 @@
 #include <LibJS/Runtime/Array.h>
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/JSONObject.h>
+#include <LibTest/Results.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <sys/time.h>
@@ -51,26 +52,6 @@ RefPtr<JS::VM> vm;
 static bool collect_on_every_allocation = false;
 static String currently_running_test;
 
-enum class TestResult {
-    Pass,
-    Fail,
-    Skip,
-};
-
-struct JSTest {
-    String name;
-    TestResult result;
-    String details;
-};
-
-struct JSSuite {
-    String name;
-    // A failed test takes precedence over a skipped test, which both have
-    // precedence over a passed test
-    TestResult most_severe_test_result { TestResult::Pass };
-    Vector<JSTest> tests {};
-};
-
 struct ParserError {
     JS::Parser::Error error;
     String hint;
@@ -82,8 +63,8 @@ struct JSFileResult {
     double time_taken { 0 };
     // A failed test takes precedence over a skipped test, which both have
     // precedence over a passed test
-    TestResult most_severe_test_result { TestResult::Pass };
-    Vector<JSSuite> suites {};
+    Test::Result most_severe_test_result { Test::Result::Pass };
+    Vector<Test::Suite> suites {};
     Vector<String> logged_messages {};
 };
 
@@ -332,12 +313,12 @@ JSFileResult TestRunner::run_file_test(const String& test_path)
     }
 
     test_json.value().as_object().for_each_member([&](const String& suite_name, const JsonValue& suite_value) {
-        JSSuite suite { suite_name };
+        Test::Suite suite { suite_name };
 
         VERIFY(suite_value.is_object());
 
         suite_value.as_object().for_each_member([&](const String& test_name, const JsonValue& test_value) {
-            JSTest test { test_name, TestResult::Fail, "" };
+            Test::Case test { test_name, Test::Result::Fail, "" };
 
             VERIFY(test_value.is_object());
             VERIFY(test_value.as_object().has("result"));
@@ -346,32 +327,32 @@ JSFileResult TestRunner::run_file_test(const String& test_path)
             VERIFY(result.is_string());
             auto result_string = result.as_string();
             if (result_string == "pass") {
-                test.result = TestResult::Pass;
+                test.result = Test::Result::Pass;
                 m_counts.tests_passed++;
             } else if (result_string == "fail") {
-                test.result = TestResult::Fail;
+                test.result = Test::Result::Fail;
                 m_counts.tests_failed++;
-                suite.most_severe_test_result = TestResult::Fail;
+                suite.most_severe_test_result = Test::Result::Fail;
                 VERIFY(test_value.as_object().has("details"));
                 auto details = test_value.as_object().get("details");
                 VERIFY(result.is_string());
                 test.details = details.as_string();
             } else {
-                test.result = TestResult::Skip;
-                if (suite.most_severe_test_result == TestResult::Pass)
-                    suite.most_severe_test_result = TestResult::Skip;
+                test.result = Test::Result::Skip;
+                if (suite.most_severe_test_result == Test::Result::Pass)
+                    suite.most_severe_test_result = Test::Result::Skip;
                 m_counts.tests_skipped++;
             }
 
             suite.tests.append(test);
         });
 
-        if (suite.most_severe_test_result == TestResult::Fail) {
+        if (suite.most_severe_test_result == Test::Result::Fail) {
             m_counts.suites_failed++;
-            file_result.most_severe_test_result = TestResult::Fail;
+            file_result.most_severe_test_result = Test::Result::Fail;
         } else {
-            if (suite.most_severe_test_result == TestResult::Skip && file_result.most_severe_test_result == TestResult::Pass)
-                file_result.most_severe_test_result = TestResult::Skip;
+            if (suite.most_severe_test_result == Test::Result::Skip && file_result.most_severe_test_result == Test::Result::Pass)
+                file_result.most_severe_test_result = Test::Result::Skip;
             m_counts.suites_passed++;
         }
 
@@ -433,12 +414,12 @@ static void print_modifiers(Vector<Modifier> modifiers)
 
 void TestRunner::print_file_result(const JSFileResult& file_result) const
 {
-    if (file_result.most_severe_test_result == TestResult::Fail || file_result.error.has_value()) {
+    if (file_result.most_severe_test_result == Test::Result::Fail || file_result.error.has_value()) {
         print_modifiers({ BG_RED, FG_BLACK, FG_BOLD });
         out(" FAIL ");
         print_modifiers({ CLEAR });
     } else {
-        if (m_print_times || file_result.most_severe_test_result != TestResult::Pass) {
+        if (m_print_times || file_result.most_severe_test_result != Test::Result::Pass) {
             print_modifiers({ BG_GREEN, FG_BLACK, FG_BOLD });
             out(" PASS ");
             print_modifiers({ CLEAR });
@@ -495,12 +476,12 @@ void TestRunner::print_file_result(const JSFileResult& file_result) const
         return;
     }
 
-    if (file_result.most_severe_test_result != TestResult::Pass) {
+    if (file_result.most_severe_test_result != Test::Result::Pass) {
         for (auto& suite : file_result.suites) {
-            if (suite.most_severe_test_result == TestResult::Pass)
+            if (suite.most_severe_test_result == Test::Result::Pass)
                 continue;
 
-            bool failed = suite.most_severe_test_result == TestResult::Fail;
+            bool failed = suite.most_severe_test_result == Test::Result::Fail;
 
             print_modifiers({ FG_GRAY, FG_BOLD });
 
@@ -530,12 +511,12 @@ void TestRunner::print_file_result(const JSFileResult& file_result) const
             print_modifiers({ CLEAR });
 
             for (auto& test : suite.tests) {
-                if (test.result == TestResult::Pass)
+                if (test.result == Test::Result::Pass)
                     continue;
 
                 print_modifiers({ FG_GRAY, FG_BOLD });
                 out("         Test:   ");
-                if (test.result == TestResult::Fail) {
+                if (test.result == Test::Result::Fail) {
                     print_modifiers({ CLEAR, FG_RED });
                     outln("{} (failed):", test.name);
                     outln("                 {}", test.details);
@@ -630,25 +611,25 @@ JSFileResult Test262ParserTestRunner::run_file_test(const String& test_path)
 
     auto start_time = get_time_in_ms();
     String details = "";
-    TestResult test_result;
+    Test::Result test_result;
     if (test_path.ends_with(".module.js")) {
-        test_result = TestResult::Skip;
+        test_result = Test::Result::Skip;
         m_counts.tests_skipped++;
         m_counts.suites_passed++;
     } else {
         auto parse_result = parse_file(test_path);
         if (expecting_file_to_parse) {
             if (!parse_result.is_error()) {
-                test_result = TestResult::Pass;
+                test_result = Test::Result::Pass;
             } else {
-                test_result = TestResult::Fail;
+                test_result = Test::Result::Fail;
                 details = parse_result.error().error.to_string();
             }
         } else {
             if (parse_result.is_error()) {
-                test_result = TestResult::Pass;
+                test_result = Test::Result::Pass;
             } else {
-                test_result = TestResult::Fail;
+                test_result = Test::Result::Fail;
                 details = "File was expected to produce a parser error but didn't";
             }
         }
@@ -661,8 +642,8 @@ JSFileResult Test262ParserTestRunner::run_file_test(const String& test_path)
     // - That way we can show additional information such as "file parsed but shouldn't have" or
     //   parser errors for files that should parse respectively
 
-    JSTest test { expecting_file_to_parse ? "file should parse" : "file should not parse", test_result, details };
-    JSSuite suite { "Parse file", test_result, { test } };
+    Test::Case test { expecting_file_to_parse ? "file should parse" : "file should not parse", test_result, details };
+    Test::Suite suite { "Parse file", test_result, { test } };
     JSFileResult file_result {
         test_path.substring(m_test_root.length() + 1, test_path.length() - m_test_root.length() - 1),
         {},
@@ -671,7 +652,7 @@ JSFileResult Test262ParserTestRunner::run_file_test(const String& test_path)
         { suite }
     };
 
-    if (test_result == TestResult::Fail) {
+    if (test_result == Test::Result::Fail) {
         m_counts.tests_failed++;
         m_counts.suites_failed++;
     } else {