To set up Travis using the matrix feature with Zuul, you can take advantage of the command line flags to launch tests for an individual browser. Here is an example of usage: zuul --browser-name chrome --browser-version 29 --browser-platform="Windows 2008" test/index.js. When using the browser flags, all other configuration is read from the .zuul.yml config.

To use the flags in your .travis.yml file, you can set up a simple configuration with environmental variables. Below is the relevant piece of a Makefile test task that runs node tests if the BROWSER_NAME variable is not defined. Otherwise it runs tests with Zuul using the individual browser represented by the BROWSER_NAME and BROWSER_VERSION variables.

test:
	@if [ "x$(BROWSER_NAME)" = "x" ]; then make test-node; else make test-zuul; fi
test-node:
	@./node_modules/.bin/mocha \
		--reporter $(REPORTER) \
		test/index.js
test-zuul:
	@./node_modules/zuul/bin/zuul \
			--browser-name $(BROWSER_NAME) \
			--browser-version $(BROWSER_VERSION) \
			test/index.js

When npm test is configured to run make test, your matrix configuration can now look something like this:

matrix:
  include:
  - node_js: '0.10'
    env: BROWSER_NAME=chrome BROWSER_VERSION=36
  - node_js: '0.10'
    env: BROWSER_NAME=safari BROWSER_VERSION=latest
  - node_js: '0.10'
    env: BROWSER_NAME=ie BROWSER_VERSION=6