diff --git a/packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/utils.ts b/packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/utils.ts
index 66865e8baf..42bddbd376 100644
--- a/packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/utils.ts
+++ b/packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/utils.ts
@@ -91,7 +91,7 @@ export function getSourceMapDevTool(
     // inline sourcemaps as otherwise paths to sourcemaps will be broken in browser
     // `webpack:///` is needed for Visual Studio breakpoints to work properly as currently
     // there is no way to set the 'webRoot'
-    sourceRoot: inlineSourceMap ? '' : 'webpack:///',
+    sourceRoot: 'webpack:///',
     moduleFilenameTemplate: '[resource-path]',
     append: hiddenSourceMap ? false : undefined,
     exclude: vendorSourceMap ? undefined : /vendor.*\.js/,
diff --git a/packages/angular_devkit/build_angular/src/angular-cli-files/plugins/karma.ts b/packages/angular_devkit/build_angular/src/angular-cli-files/plugins/karma.ts
index 86c7ffac7e..4fa22ac44f 100644
--- a/packages/angular_devkit/build_angular/src/angular-cli-files/plugins/karma.ts
+++ b/packages/angular_devkit/build_angular/src/angular-cli-files/plugins/karma.ts
@@ -70,15 +70,9 @@ const init: any = (config: any, emitter: any, customFileHandlers: any) => {
   successCb = config.buildWebpack.successCb;
   failureCb = config.buildWebpack.failureCb;
 
-  // When using code-coverage, auto-add coverage-istanbul.
-  config.reporters = config.reporters || [];
-  if (options.codeCoverage && config.reporters.indexOf('coverage-istanbul') === -1) {
-    config.reporters.push('coverage-istanbul');
-  }
-
   // Add a reporter that fixes sourcemap urls.
   if (normalizeSourceMaps(options.sourceMap).scripts) {
-    config.reporters.push('@angular-devkit/build-angular--sourcemap-reporter');
+    config.reporters.unshift('@angular-devkit/build-angular--sourcemap-reporter');
 
     // Code taken from https://github.com/tschaub/karma-source-map-support.
     // We can't use it directly because we need to add it conditionally in this file, and karma
@@ -92,8 +86,14 @@ const init: any = (config: any, emitter: any, customFileHandlers: any) => {
     ], true);
   }
 
-  config.reporters.push('@angular-devkit/build-angular--event-reporter');
+  config.reporters.unshift('@angular-devkit/build-angular--event-reporter');
 
+  // When using code-coverage, auto-add coverage-istanbul.
+  config.reporters = config.reporters || [];
+  if (options.codeCoverage && config.reporters.indexOf('coverage-istanbul') === -1) {
+    config.reporters.unshift('coverage-istanbul');
+  }
+    
   // Add webpack config.
   const webpackConfig = config.buildWebpack.webpackConfig;
   const webpackMiddlewareConfig = {
@@ -284,16 +284,13 @@ eventReporter.$inject = ['baseReporterDecorator', 'config'];
 // Strip the server address and webpack scheme (webpack://) from error log.
 const sourceMapReporter: any = function (this: any, baseReporterDecorator: any, config: any) {
   baseReporterDecorator(this);
-
   muteDuplicateReporterLogging(this, config);
 
-  const urlRegexp = /http:\/\/localhost:\d+\/_karma_webpack_\/webpack:\//gi;
+  const urlRegexp = /http:\/\/localhost:\d+\/_karma_webpack_\/(webpack:\/)?/gi;
 
   this.onSpecComplete = function (_browser: any, result: any) {
-    if (!result.success && result.log.length > 0) {
-      result.log.forEach((log: string, idx: number) => {
-        result.log[idx] = log.replace(urlRegexp, '');
-      });
+    if (!result.success) {
+      result.log = result.log.map((l: string) => l.replace(urlRegexp, ''));
     }
   };
 
diff --git a/tests/legacy-cli/e2e/tests/misc/karma-error-paths.ts b/tests/legacy-cli/e2e/tests/misc/karma-error-paths.ts
new file mode 100644
index 0000000000..d8916ab6ea
--- /dev/null
+++ b/tests/legacy-cli/e2e/tests/misc/karma-error-paths.ts
@@ -0,0 +1,24 @@
+import { writeMultipleFiles } from '../../utils/fs';
+import { ng } from '../../utils/process';
+import { expectToFail } from '../../utils/utils';
+
+export default async function () {
+  await writeMultipleFiles({
+    'src/app/app.component.spec.ts': `
+        describe('AppComponent', () => {
+          it('failing test', () => {
+            expect('1').toEqual('2');
+          });
+        });
+      `,
+  });
+
+  const { message } = await expectToFail(() => ng('test', '--no-watch'));
+  if (message.includes('_karma_webpack_')) {
+    throw new Error(`Didn't expect logs to server address and webpack scheme.\n${message}`);
+  }
+
+  if (!message.includes('(src/app/app.component.spec.ts:4:25)')) {
+    throw new Error(`Expected logs to contain relative path to (src/app/app.component.spec.ts:4:25)\n${message}`);
+  }
+}