Enable source-mapped error stacktraces in tests

See https://github.com/hypothesis/browser-extension/pull/681

package.json

@@ -65,6 +65,7 @@
     "karma-mocha": "^2.0.0",
     "karma-mocha-reporter": "^2.0.4",
     "karma-sinon": "^1.0.5",
+    "karma-source-map-support": "^1.4.0",
     "katex": "^0.13.0",
     "lodash.debounce": "^4.0.3",
     "mocha": "9.1.2",

rollup-tests.config.js

@@ -13,6 +13,7 @@ export default {
     file: 'build/scripts/tests.bundle.js',
     format: 'iife',
     name: 'testsBundle', // This just exists to suppress a build warning.
+    sourcemap: true,
   },
   treeshake: false,
   plugins: [

src/karma.config.js

@@ -47,7 +47,7 @@ module.exports = function (config) {
 
     // frameworks to use
     // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-    frameworks: ['mocha', 'chai', 'sinon'],
+    frameworks: ['mocha', 'chai', 'sinon', 'source-map-support'],
 
     // list of files / patterns to load in the browser
     files: [
@@ -57,6 +57,9 @@ module.exports = function (config) {
       // Test bundles.
       '../build/scripts/tests.bundle.js',
 
+      // Sourcemaps for test bundles.
+      { pattern: '../build/scripts/*.js.map', included: false },
+
       // CSS bundles, relied upon by accessibility tests (eg. for color-contrast
       // checks).
       {

yarn.lock

@@ -4835,6 +4835,13 @@ karma-sinon@^1.0.5:
   resolved "https://registry.yarnpkg.com/karma-sinon/-/karma-sinon-1.0.5.tgz#4e3443f2830fdecff624d3747163f1217daa2a9a"
   integrity sha1-TjRD8oMP3s/2JNN0cWPxIX2qKpo=
 
+karma-source-map-support@^1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/karma-source-map-support/-/karma-source-map-support-1.4.0.tgz#58526ceccf7e8730e56effd97a4de8d712ac0d6b"
+  integrity sha512-RsBECncGO17KAoJCYXjv+ckIz+Ii9NCi+9enk+rq6XC81ezYkb4/RHE6CTXdA7IOJqoF3wcaLfVG0CPmE5ca6A==
+  dependencies:
+    source-map-support "^0.5.5"
+
 karma@^6.0.1:
   version "6.3.4"
   resolved "https://registry.yarnpkg.com/karma/-/karma-6.3.4.tgz#359899d3aab3d6b918ea0f57046fd2a6b68565e6"
@@ -6691,7 +6698,7 @@ source-map-resolve@^0.5.0:
     source-map-url "^0.4.0"
     urix "^0.1.0"
 
-source-map-support@~0.5.20:
+source-map-support@^0.5.5, source-map-support@~0.5.20:
   version "0.5.20"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.20.tgz#12166089f8f5e5e8c56926b377633392dd2cb6c9"
   integrity sha512-n1lZZ8Ve4ksRqizaBQgxXDgKwttHDhyfQjA6YZZn8+AroHbsIz+JjwxQDxbp+7y5OYCI8t1Yk7etjD9CRd2hIw==