diff --git a/packages/rudy/package.json b/packages/rudy/package.json
index 02e02f252..22b496023 100644
--- a/packages/rudy/package.json
+++ b/packages/rudy/package.json
@@ -23,7 +23,8 @@
     "prettier": "prettier",
     "is-pretty": "prettier --ignore-path=../../config/.prettierignore '**/*' --list-different",
     "prettify": "prettier --ignore-path=../../config/.prettierignore '**/*' --write",
-    "lint": "eslint . || true"
+    "lint": "eslint . || true",
+    "test": "jest --config ../../jest.config.js --rootDir ."
   },
   "repository": {
     "type": "git",
diff --git a/packages/rudy/src/utils/actionToUrl.test.js b/packages/rudy/src/utils/actionToUrl.test.js
new file mode 100644
index 000000000..e050718ef
--- /dev/null
+++ b/packages/rudy/src/utils/actionToUrl.test.js
@@ -0,0 +1,201 @@
+import actionToUrl from './actionToUrl'
+
+describe('Serializes params', () => {
+  const NOT_FOUND = 'NOT_FOUND'
+  const ROOT = 'ROOT'
+  const STATIC = 'STATIC'
+  const SINGLE_PARAM = 'SINGLE_PARAM'
+  const OPTIONAL_PARAM = 'OPTIONAL_PARAM'
+  const MULTIPLE_PARAMS = 'MULTIPLE_PARAMS'
+  const OPTIONAL_PATH_PARAM = 'OPTIONAL_PATH_PARAM'
+  const COMPULSORY_PATH_PARAM = 'COMPULSORY_PATH_PARAM'
+  const MULTI_MULTI_PARAM = 'MULTI_MULTI_PARAM'
+  const routes = {
+    [NOT_FOUND]: {
+      path: '/404',
+    },
+    [ROOT]: {
+      path: '',
+    },
+    [STATIC]: {
+      path: '/static',
+    },
+    [SINGLE_PARAM]: {
+      path: '/compulsory/:param',
+    },
+    [OPTIONAL_PARAM]: {
+      path: '/optional/:param?',
+    },
+    [MULTIPLE_PARAMS]: {
+      path: '/multiple/:p1/:p2',
+    },
+    [OPTIONAL_PATH_PARAM]: {
+      path: '/multistar/:p*',
+    },
+    [COMPULSORY_PATH_PARAM]: {
+      path: '/multiplus/:p+',
+    },
+    [MULTI_MULTI_PARAM]: {
+      path: '/multimulti/:p1*/separator/:p2+',
+    },
+  }
+  const api = {
+    routes,
+    options: {},
+  }
+  const assertUrlForAction = (action, url) =>
+    expect(actionToUrl(action, api, {})).toEqual({
+      url,
+      state: {},
+    })
+
+  it('Static path', () => {
+    /**
+     * TODO the route regex doesn't have a trailing slash, so this
+     * generated URL also should not!
+     */
+    assertUrlForAction({ type: ROOT }, '/')
+    assertUrlForAction({ type: STATIC }, '/static')
+  })
+
+  it('Single compulsory parameter', () => {
+    assertUrlForAction({ type: SINGLE_PARAM }, '/404')
+
+    /**
+     * TODO null should be treated as missing, not serialised to "null"
+     */
+    assertUrlForAction(
+      { type: SINGLE_PARAM, params: { param: null } },
+      '/compulsory/null',
+    )
+
+    assertUrlForAction(
+      { type: SINGLE_PARAM, params: { param: undefined } },
+      '/404',
+    )
+
+    assertUrlForAction(
+      { type: SINGLE_PARAM, params: { param: 'apple' } },
+      '/compulsory/apple',
+    )
+  })
+
+  it('Single optional parameter', () => {
+    assertUrlForAction({ type: OPTIONAL_PARAM }, '/optional')
+
+    /**
+     * TODO null should be treated as missing, not serialised to "null"
+     */
+    assertUrlForAction(
+      { type: OPTIONAL_PARAM, params: { param: null } },
+      '/optional/null',
+    )
+
+    assertUrlForAction(
+      { type: OPTIONAL_PARAM, params: { param: undefined } },
+      '/optional',
+    )
+
+    assertUrlForAction(
+      { type: OPTIONAL_PARAM, params: { param: 'test' } },
+      '/optional/test',
+    )
+  })
+
+  it('Multiple parameters', () => {
+    assertUrlForAction({ type: MULTIPLE_PARAMS, params: {} }, '/404')
+
+    assertUrlForAction({ type: MULTIPLE_PARAMS, params: { p1: 1 } }, '/404')
+
+    assertUrlForAction(
+      { type: MULTIPLE_PARAMS, params: { p1: 1, p2: 2 } },
+      '/multiple/1/2',
+    )
+  })
+
+  it('Multi segment optional parameter', () => {
+    assertUrlForAction({ type: OPTIONAL_PATH_PARAM }, '/multistar')
+
+    assertUrlForAction(
+      { type: OPTIONAL_PATH_PARAM, params: { p: undefined } },
+      '/multistar',
+    )
+
+    /**
+     * TODO null should be treated as missing, not serialised to "null"
+     */
+    assertUrlForAction(
+      { type: OPTIONAL_PATH_PARAM, params: { p: null } },
+      '/multistar/null',
+    )
+
+    assertUrlForAction({ type: OPTIONAL_PATH_PARAM, params: { p: '' } }, '/404')
+
+    assertUrlForAction(
+      { type: OPTIONAL_PATH_PARAM, params: { p: 'single' } },
+      '/multistar/single',
+    )
+
+    assertUrlForAction(
+      { type: OPTIONAL_PATH_PARAM, params: { p: 'one/two/three' } },
+      '/multistar/one/two/three',
+    )
+  })
+
+  it('Multi segment compulsory parameter', () => {
+    assertUrlForAction(
+      { type: COMPULSORY_PATH_PARAM, params: { p: undefined } },
+      '/404',
+    )
+
+    /**
+     * TODO null should be treated as missing, not serialised to "null"
+     */
+    assertUrlForAction(
+      { type: COMPULSORY_PATH_PARAM, params: { p: null } },
+      '/multiplus/null',
+    )
+
+    assertUrlForAction(
+      { type: COMPULSORY_PATH_PARAM, params: { p: '' } },
+      '/404',
+    )
+
+    assertUrlForAction(
+      { type: COMPULSORY_PATH_PARAM, params: { p: 'one' } },
+      '/multiplus/one',
+    )
+
+    assertUrlForAction(
+      { type: COMPULSORY_PATH_PARAM, params: { p: 'one/two' } },
+      '/multiplus/one/two',
+    )
+  })
+
+  it('Multiple multi segment params', () => {
+    assertUrlForAction({ type: MULTI_MULTI_PARAM, params: {} }, '/404')
+
+    assertUrlForAction(
+      { type: MULTI_MULTI_PARAM, params: { p1: 'one' } },
+      '/404',
+    )
+
+    assertUrlForAction(
+      { type: MULTI_MULTI_PARAM, params: { p2: 'one' } },
+      '/multimulti/separator/one',
+    )
+
+    assertUrlForAction(
+      { type: MULTI_MULTI_PARAM, params: { p2: 'one/two' } },
+      '/multimulti/separator/one/two',
+    )
+
+    assertUrlForAction(
+      {
+        type: MULTI_MULTI_PARAM,
+        params: { p1: 'one/two', p2: 'three/four' },
+      },
+      '/multimulti/one/two/separator/three/four',
+    )
+  })
+})
diff --git a/packages/rudy/src/utils/urlToAction.test.js b/packages/rudy/src/utils/urlToAction.test.js
new file mode 100644
index 000000000..c382c7338
--- /dev/null
+++ b/packages/rudy/src/utils/urlToAction.test.js
@@ -0,0 +1,143 @@
+import urlToAction from './urlToAction'
+
+describe('Parses params', () => {
+  const NOT_FOUND = 'NOT_FOUND'
+  const ROOT = 'ROOT'
+  const STATIC = 'STATIC'
+  const SINGLE_PARAM = 'SINGLE_PARAM'
+  const OPTIONAL_PARAM = 'OPTIONAL_PARAM'
+  const MULTIPLE_PARAMS = 'MULTIPLE_PARAMS'
+  const OPTIONAL_PATH_PARAM = 'OPTIONAL_PATH_PARAM'
+  const COMPULSORY_PATH_PARAM = 'COMPULSORY_PATH_PARAM'
+  const MULTI_MULTI_PARAM = 'MULTI_MULTI_PARAM'
+  const routes = {
+    [NOT_FOUND]: {
+      path: '/404',
+    },
+    [ROOT]: {
+      path: '',
+    },
+    [STATIC]: {
+      path: '/static',
+    },
+    [SINGLE_PARAM]: {
+      path: '/compulsory/:param',
+    },
+    [OPTIONAL_PARAM]: {
+      path: '/optional/:param?',
+    },
+    [MULTIPLE_PARAMS]: {
+      path: '/multiple/:p1/:p2',
+    },
+    [OPTIONAL_PATH_PARAM]: {
+      path: '/multistar/:p*',
+    },
+    [COMPULSORY_PATH_PARAM]: {
+      path: '/multiplus/:p+',
+    },
+    [MULTI_MULTI_PARAM]: {
+      path: '/multimulti/:p1*/separator/:p2+',
+    },
+  }
+  const api = {
+    routes,
+    options: {},
+  }
+
+  const assertActionForUrl = (url, action) =>
+    expect(urlToAction(api, url, {})).toEqual({
+      basename: '',
+      hash: '',
+      location: {
+        key: '345678',
+        pathname: url,
+        scene: '',
+        search: '',
+        url,
+      },
+      query: {},
+      state: {},
+      params: {},
+      ...action,
+    })
+
+  it('Static path', () => {
+    /**
+     * TODO the route regex doesn't have a trailing slash, so this
+     * URL should match!
+     */
+    // assertActionForUrl('', { type: ROOT })
+
+    assertActionForUrl('/static', { type: STATIC })
+  })
+
+  it('Single compulsory parameter', () => {
+    assertActionForUrl('/compulsory', { type: NOT_FOUND })
+
+    assertActionForUrl('/compulsory/apple', {
+      type: SINGLE_PARAM,
+      params: { param: 'apple' },
+    })
+  })
+
+  it('Single optional parameter', () => {
+    assertActionForUrl('/optional', { type: OPTIONAL_PARAM })
+
+    assertActionForUrl('/optional/test', {
+      type: OPTIONAL_PARAM,
+      params: { param: 'test' },
+    })
+  })
+
+  it('Multiple parameters', () => {
+    assertActionForUrl('/multiple/1/2', {
+      type: MULTIPLE_PARAMS,
+      params: { p1: '1', p2: '2' },
+    })
+  })
+
+  it('Multi segment optional parameter', () => {
+    assertActionForUrl('/multistar', { type: OPTIONAL_PATH_PARAM })
+
+    assertActionForUrl('/multistar/single', {
+      type: OPTIONAL_PATH_PARAM,
+      params: { p: 'single' },
+    })
+
+    assertActionForUrl('/multistar/one/two/three', {
+      type: OPTIONAL_PATH_PARAM,
+      params: { p: 'one/two/three' },
+    })
+  })
+
+  it('Multi segment compulsory parameter', () => {
+    assertActionForUrl('/multiplus', { type: NOT_FOUND })
+
+    assertActionForUrl('/multiplus/one', {
+      type: COMPULSORY_PATH_PARAM,
+      params: { p: 'one' },
+    })
+
+    assertActionForUrl('/multiplus/one/two', {
+      type: COMPULSORY_PATH_PARAM,
+      params: { p: 'one/two' },
+    })
+  })
+
+  it('Multiple multi segment params', () => {
+    assertActionForUrl('/multimulti/separator/one', {
+      type: MULTI_MULTI_PARAM,
+      params: { p2: 'one' },
+    })
+
+    assertActionForUrl('/multimulti/separator/one/two', {
+      type: MULTI_MULTI_PARAM,
+      params: { p2: 'one/two' },
+    })
+
+    assertActionForUrl('/multimulti/one/two/separator/three/four', {
+      type: MULTI_MULTI_PARAM,
+      params: { p1: 'one/two', p2: 'three/four' },
+    })
+  })
+})