diff --git a/package.json b/package.json
index 8e1e28c..fb08ad3 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
   "dependencies": {
     "axios": "^0.21.0",
     "chai": "^4.2.0",
+    "esm": "^3.2.25",
     "flitter-auth": "^0.19.1",
     "flitter-cli": "^0.16.0",
     "flitter-di": "^0.5.0",
@@ -31,7 +32,7 @@
     "sinon": "^9.2.1"
   },
   "scripts": {
-    "test_units": "./node_modules/.bin/mocha --reporter spec test"
+    "test_frontend": "./node_modules/.bin/mocha -r esm --reporter spec test/frontend",
+    "test_backend": "./node_modules/.bin/mocha --reporter spec test/backend"
   }
-
 }
diff --git a/test/backend/.gitkeep b/test/backend/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/test/frontend/.gitkeep b/test/frontend/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/test/frontend/module_routing.spec.js b/test/frontend/module_routing.spec.js
new file mode 100644
index 0000000..8495f12
--- /dev/null
+++ b/test/frontend/module_routing.spec.js
@@ -0,0 +1,43 @@
+import { expect } from 'chai'
+import sinon from 'sinon'
+import {router} from '../../frontend/src/module/routing'
+
+// Since we're testing code meant for the browser, not node, mock this
+global.window = global
+
+describe('the html5 history router', function() {
+    it('should be a functional class', function() {
+        expect(router).to.exist
+    })
+
+    it('should use the global base path', function() {
+        global.APP_BASE_PATH = 'testing-1-2-3'
+        expect(router.base_path).to.be.equal('testing-1-2-3')
+    })
+
+    it('should navigate using the History API', function() {
+        const args = { test: 123 }
+
+        // mock this history API
+        global.history = {
+            pushState: sinon.spy()
+        }
+
+        router.navigate('some-path', args)
+        expect(global.history.pushState.calledOnce).to.be.true
+        expect(global.history.pushState.getCall(0).args[1]).to.be.equal('some-path')
+        expect(router.route_args).to.be.equal(args)
+    })
+
+    it('should call subscribers on navigate', function() {
+        const handler = sinon.spy()
+        const args = { test: 123 }
+
+        router.subscribe(handler)
+        router.navigate('some-other-path', args)
+
+        expect(handler.calledOnce).to.be.true
+        expect(handler.getCall(0).args[0]).to.be.equal('some-other-path')
+        expect(handler.getCall(0).args[1]).to.be.equal(args)
+    })
+})
diff --git a/yarn.lock b/yarn.lock
index 79ce484..cd2b195 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1448,6 +1448,11 @@ escape-string-regexp@4.0.0:
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz#14ba83a5d373e3d311e5afca29cf5bfad965bf34"
   integrity sha512-TtpcNJ3XAzx3Gq8sWRzJaVajRs0uVxA2YAkdb1jm2YkPz4G6egUFAyA3n5vtEIZefPk5Wa4UXbKuS5fKkJWdgA==
 
+esm@^3.2.25:
+  version "3.2.25"
+  resolved "https://registry.yarnpkg.com/esm/-/esm-3.2.25.tgz#342c18c29d56157688ba5ce31f8431fbb795cc10"
+  integrity sha512-U1suiZ2oDVWv4zPO56S0NcR5QriEahGtdN2OR6FiOG4WJvcjBVFB0qI4+eKoWFH483PKGuLuu6V8Z4T5g63UVA==
+
 esprima-fb@^10001.1.0-dev-harmony-fb:
   version "10001.1.0-dev-harmony-fb"
   resolved "https://registry.yarnpkg.com/esprima-fb/-/esprima-fb-10001.1.0-dev-harmony-fb.tgz#f7efb452d3c8006dde6b3c59678604f7114a882c"