test: update mocha tests to use goog_module (#5440)

* Use goog.module in mocha tests

* Fix compiler warnings

* Make test helpers a module

* Name test modules Blockly.test.*

This is to be more consistent with how non-test modules are named.

Also remove top-level goog.require of TestHelpers (now
Blockly.test.helpers) since requiring a side-effect-less module does
nothing.

* Convert block_test.js and comment_test.js to goog.module syntax

* Address PR comments

* Goog modulify tests

* Goog modulify toolbox helpers

* Fixes imports and moves common tests from workspace_test.js to a helper file.

* Update test deps after rebase

Co-authored-by: Christopher Allen <cpcallen+git@google.com>

scripts/gulpfiles/build_tasks.js

@@ -337,13 +337,25 @@ function buildDeps(done) {
   const closurePath = argv.closureLibrary ?
       'node_modules/google-closure-library/closure/goog' :
       'closure/goog';
+
   const roots = [
     closurePath,
     'core',
     'blocks',
   ];
+
+  const testRoots = [
+    ...roots,
+    'generators',
+    'tests/mocha'
+  ];
+
   const args = roots.map(root => `--root '${root}' `).join('');
   execSync(`closure-make-deps ${args} > tests/deps.js`, {stdio: 'inherit'});
+
+  const testArgs = testRoots.map(root => `--root '${root}' `).join('');
+  execSync(`closure-make-deps ${testArgs} > tests/deps.mocha.js`,
+      {stdio: 'inherit'});
   done();
 };