test_runner: pass harness object as option to root test

This commit initializes the root harness object before the root
test and passes the harness as an option to the root test
constructor. This commit also attaches the global configuration
to the harness. This will allow the parseCommandLine() call in
test.js to be removed, as those values are now available via
the root test.

PR-URL: #54353
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

lib/internal/test_runner/harness.js

@@ -35,7 +35,42 @@ let globalRoot;
 testResources.set(reporterScope.asyncId(), reporterScope);
 
 function createTestTree(options = kEmptyObject) {
-  globalRoot = setup(new Test({ __proto__: null, ...options, name: '<root>' }));
+  const globalOptions = parseCommandLine();
+  const harness = {
+    __proto__: null,
+    allowTestsToRun: false,
+    bootstrapPromise: resolvedPromise,
+    watching: false,
+    config: globalOptions,
+    coverage: null,
+    resetCounters() {
+      harness.counters = {
+        __proto__: null,
+        all: 0,
+        failed: 0,
+        passed: 0,
+        cancelled: 0,
+        skipped: 0,
+        todo: 0,
+        topLevel: 0,
+        suites: 0,
+      };
+    },
+    counters: null,
+    shouldColorizeTestFiles: shouldColorizeTestFiles(globalOptions.destinations),
+    teardown: null,
+    snapshotManager: null,
+  };
+
+  harness.resetCounters();
+  globalRoot = new Test({
+    __proto__: null,
+    ...options,
+    harness,
+    name: '<root>',
+  });
+  setupProcessState(globalRoot, globalOptions, harness);
+  globalRoot.startTime = hrtime();
   return globalRoot;
 }
 
@@ -127,15 +162,7 @@ function collectCoverage(rootTest, coverage) {
   return summary;
 }
 
-function setup(root) {
-  if (root.startTime !== null) {
-    return root;
-  }
-
-  // Parse the command line options before the hook is enabled. We don't want
-  // global input validation errors to end up in the uncaughtException handler.
-  const globalOptions = parseCommandLine();
-
+function setupProcessState(root, globalOptions) {
   const hook = createHook({
     __proto__: null,
     init(asyncId, type, triggerAsyncId, resource) {
@@ -195,33 +222,8 @@ function setup(root) {
     process.on('SIGTERM', terminationHandler);
   }
 
-  root.harness = {
-    __proto__: null,
-    allowTestsToRun: false,
-    bootstrapPromise: resolvedPromise,
-    watching: false,
-    coverage: FunctionPrototypeBind(collectCoverage, null, root, coverage),
-    resetCounters() {
-      root.harness.counters = {
-        __proto__: null,
-        all: 0,
-        failed: 0,
-        passed: 0,
-        cancelled: 0,
-        skipped: 0,
-        todo: 0,
-        topLevel: 0,
-        suites: 0,
-      };
-    },
-    counters: null,
-    shouldColorizeTestFiles: shouldColorizeTestFiles(globalOptions.destinations),
-    teardown: exitHandler,
-    snapshotManager: null,
-  };
-  root.harness.resetCounters();
-  root.startTime = hrtime();
-  return root;
+  root.harness.coverage = FunctionPrototypeBind(collectCoverage, null, root, coverage);
+  root.harness.teardown = exitHandler;
 }
 
 function lazyBootstrapRoot() {

lib/internal/test_runner/test.js

@@ -395,6 +395,7 @@ class Test extends AsyncResource {
       this.timeout = kDefaultTimeout;
       this.entryFile = entryFile;
       this.root = this;
+      this.harness = options.harness;
       this.hooks = {
         __proto__: null,
         before: [],
@@ -416,6 +417,7 @@ class Test extends AsyncResource {
       this.timeout = parent.timeout;
       this.entryFile = parent.entryFile;
       this.root = parent.root;
+      this.harness = null;
       this.hooks = {
         __proto__: null,
         before: [],
@@ -480,7 +482,6 @@ class Test extends AsyncResource {
     );
 
     this.fn = fn;
-    this.harness = null; // Configured on the root test by the test harness.
     this.mock = null;
     this.plan = null;
     this.expectedAssertions = plan;