diff --git a/doc/docker/developing_with_docker.md b/doc/docker/developing_with_docker.md
index 5d652021087e..b080e0e9b4da 100644
--- a/doc/docker/developing_with_docker.md
+++ b/doc/docker/developing_with_docker.md
@@ -139,10 +139,11 @@ $ docker-compose run --rm web bundle exec rspec spec
 
 ## Running javascript tests
 
-To run tests in headless Chrome:
+To run tests in headless Chrome, add the `docker-compose/js-tests.override.yml`
+to the `COMPOSE_FILE` environment variable in your .env, and run:
 
 ```
-$ docker-compose run --rm karma yarn run test-headless
+$ docker-compose run --rm js-tests
 ```
 
 ### Selenium
diff --git a/doc/testing_javascript.md b/doc/testing_javascript.md
index 94035c635252..665289c45a5e 100644
--- a/doc/testing_javascript.md
+++ b/doc/testing_javascript.md
@@ -3,6 +3,23 @@
 The process of testing JavaScript sometimes confuses people. This document's goal
 is to alleviate that confusion and establish how to run JavaScript tests.
 
+## With Docker and headless Chrome
+
+This is probably the easiest way to run tests, especially for developers that
+don't work with Canvas on a regular basis.
+
+Create a `.env` file in the repository root, containing:
+
+```
+COMPOSE_FILE=docker-compose.yml:docker-compose.override.yml:docker-compose/js-tests.override.yml
+```
+
+Then run:
+
+```
+docker-compose run --rm js-tests
+```
+
 ## With Docker and Webpack
 
 This is becoming the go to standard for running Canvas and compiling your not-JavaScript
diff --git a/docker-compose.override.yml b/docker-compose.override.yml
index 13f4753c0ebd..9ea2df70c8a5 100644
--- a/docker-compose.override.yml
+++ b/docker-compose.override.yml
@@ -35,12 +35,6 @@ services:
       <<: *BASE-ENV
       VIRTUAL_HOST: .canvas.docker
 
-  karma:
-    <<: *BASE
-    build:
-      context: .
-      dockerfile: docker-compose/karma/Dockerfile
-
   postgres:
     volumes:
       - pg_data:/var/lib/postgresql/data
diff --git a/docker-compose/js-tests.override.yml b/docker-compose/js-tests.override.yml
index 48f0ca461052..77fc42725f0c 100644
--- a/docker-compose/js-tests.override.yml
+++ b/docker-compose/js-tests.override.yml
@@ -6,12 +6,18 @@ services:
   js-tests:
     build: ./docker-compose/karma
     volumes:
-      - .:/app
-      - generated_1:/app/public/javascripts/client_apps
-      - generated_2:/app/public/dist
-      - i18nliner_node_modules:/app/gems/canvas_i18nliner/node_modules
-      - node_modules:/app/node_modules
-      - quizzes_node_modules:/app/client_apps/canvas_quizzes/node_modules
-      - selinimum_node_modules:/app/gems/selinimum/node_modules
+      - .:/usr/src/app
+      - brandable_css_brands:/usr/src/app/app/stylesheets/brandable_css_brands
+      - generated_1:/usr/src/app/public/javascripts/client_apps
+      - generated_2:/usr/src/app/public/dist
+      - generated_3:/usr/src/app/public/javascripts/compiled
+      - i18nliner_node_modules:/usr/src/app/gems/canvas_i18nliner/node_modules
+      - log:/usr/src/app/log
+      - node_modules:/usr/src/app/node_modules
+      - quizzes_node_modules:/usr/src/app/client_apps/canvas_quizzes/node_modules
+      - selinimum_node_modules:/usr/src/app/gems/selinimum/node_modules
+      - tmp:/usr/src/app/tmp
+      - yarn-cache:/home/docker/.cache/yarn
     environment:
       NODE_ENV: CI
+    command: yarn run test-watch-headless
diff --git a/package.json b/package.json
index 148a927012ba..6c77c7c75192 100644
--- a/package.json
+++ b/package.json
@@ -139,6 +139,7 @@
     "test": "karma start --single-run",
     "test-headless": "karma start --single-run --browsers ChromeHeadlessNoSandbox",
     "test-watch": "karma start",
+    "test-watch-headless": "karma start --browsers ChromeHeadlessNoSandbox",
     "preinstall": "script/gem_npm install",
     "preupdate": "script/gem_npm update",
     "build": "yarn run build:css && yarn run build:js",