Add a TESTING build option, to enable using non-production/test-only code-paths

Since the tests (currently) run with the `pdf.worker.js` file built, i.e. with `PRODUCTION = true` set, there's no simple way to add e.g. `assert` calls for both non-production *and* test-only builds without also affecting PRODUCTION builds.

gulpfile.js

@@ -86,6 +86,7 @@ var AUTOPREFIXER_CONFIG = {
 
 var DEFINES = {
   PRODUCTION: true,
+  TESTING: false,
   // The main build targets:
   GENERIC: false,
   FIREFOX: false,
@@ -137,6 +138,7 @@ function createWebpackConfig(defines, output) {
   var bundleDefines = builder.merge(defines, {
     BUNDLE_VERSION: versionInfo.version,
     BUNDLE_BUILD: versionInfo.commit,
+    TESTING: (defines.TESTING || process.env['TESTING'] === 'true'),
   });
   var licenseHeaderLibre =
     fs.readFileSync('./src/license_header_libre.js').toString();
@@ -875,6 +877,7 @@ gulp.task('lib', ['buildnumber'], function () {
       LIB: true,
       BUNDLE_VERSION: versionInfo.version,
       BUNDLE_BUILD: versionInfo.commit,
+      TESTING: process.env['TESTING'] === 'true',
     }),
     map: {
       'pdfjs-lib': '../pdf',
@@ -927,34 +930,39 @@ gulp.task('publish', ['generic'], function (done) {
     });
 });
 
-gulp.task('test', ['generic', 'components'], function () {
+gulp.task('testing-pre', function() {
+  process.env['TESTING'] = 'true';
+});
+
+gulp.task('test', ['testing-pre', 'generic', 'components'], function() {
   return streamqueue({ objectMode: true, },
     createTestSource('unit'), createTestSource('browser'));
 });
 
-gulp.task('bottest', ['generic', 'components'], function () {
+gulp.task('bottest', ['testing-pre', 'generic', 'components'], function() {
   return streamqueue({ objectMode: true, },
     createTestSource('unit'), createTestSource('font'),
     createTestSource('browser (no reftest)'));
 });
 
-gulp.task('browsertest', ['generic', 'components'], function () {
+gulp.task('browsertest', ['testing-pre', 'generic', 'components'], function() {
   return createTestSource('browser');
 });
 
-gulp.task('unittest', ['generic', 'components'], function () {
+gulp.task('unittest', ['testing-pre', 'generic', 'components'], function() {
   return createTestSource('unit');
 });
 
-gulp.task('fonttest', function () {
+gulp.task('fonttest', ['testing-pre'], function() {
   return createTestSource('font');
 });
 
-gulp.task('makeref', ['generic', 'components'], function (done) {
+gulp.task('makeref', ['testing-pre', 'generic', 'components'], function(done) {
   makeRef(done);
 });
 
-gulp.task('botmakeref', ['generic', 'components'], function (done) {
+gulp.task('botmakeref', ['testing-pre', 'generic', 'components'],
+    function(done) {
   makeRef(done, true);
 });
 
@@ -994,7 +1002,7 @@ gulp.task('baseline', function (done) {
   });
 });
 
-gulp.task('unittestcli', ['lib'], function (done) {
+gulp.task('unittestcli', ['testing-pre', 'lib'], function(done) {
   var args = ['JASMINE_CONFIG_PATH=test/unit/clitests.json'];
   var testProcess = spawn('node_modules/.bin/jasmine', args,
                           { stdio: 'inherit', });

src/core/parser.js

@@ -34,8 +34,10 @@ const MAX_ADLER32_LENGTH = 5552;
 
 function computeAdler32(bytes) {
   let bytesLength = bytes.length;
-  if (bytesLength >= MAX_ADLER32_LENGTH) {
-    throw new Error('computeAdler32: The input is too large.');
+  if (typeof PDFJSDev === 'undefined' ||
+      PDFJSDev.test('!PRODUCTION || TESTING')) {
+    assert(bytesLength < MAX_ADLER32_LENGTH,
+           'computeAdler32: Unsupported "bytes" length.');
   }
   let a = 1, b = 0;
   for (let i = 0; i < bytesLength; ++i) {

src/core/worker.js

@@ -379,8 +379,10 @@ var WorkerMessageHandler = {
     let apiVersion = docParams.apiVersion;
     let workerVersion =
       typeof PDFJSDev !== 'undefined' ? PDFJSDev.eval('BUNDLE_VERSION') : null;
-    // The `apiVersion !== null` check is needed to avoid errors during testing.
-    if (apiVersion !== null && apiVersion !== workerVersion) {
+    if ((typeof PDFJSDev !== 'undefined' && PDFJSDev.test('TESTING')) &&
+        apiVersion === null) {
+      warn('Ignoring apiVersion/workerVersion check in TESTING builds.');
+    } else if (apiVersion !== workerVersion) {
       throw new Error(`The API version "${apiVersion}" does not match ` +
                       `the Worker version "${workerVersion}".`);
     }