diff --git a/source/connector-mobilizon/front/graphql-wrapper.js b/source/connector-mobilizon/front/graphql-wrapper.js
index b2f291f..cbe9684 100644
--- a/source/connector-mobilizon/front/graphql-wrapper.js
+++ b/source/connector-mobilizon/front/graphql-wrapper.js
@@ -17,12 +17,12 @@ export function getUpcomingEvents({ url, limit }) {
       }
     }
   `
-  const dataInCache = SessionCache.get({ url, query, variables: { limit }})
+  const dataInCache = SessionCache.get(sessionStorage, { url, query, variables: { limit }})
   if (dataInCache !== null)
     return Promise.resolve(dataInCache)
   return request(url, query, { limit })
     .then((data) => {
-      SessionCache.add({ url, query, variables: { limit }}, data)
+      SessionCache.add(sessionStorage, { url, query, variables: { limit }}, data)
       return Promise.resolve(data)
     })
 }
@@ -45,12 +45,12 @@ export function getUpcomingEventsByGroupName({ url, limit, groupName }) {
     }
   `
   const afterDatetime = DateTimeWrapper.getCurrentDatetimeAsString()
-  const dataInCache = SessionCache.get({ url, query, variables: { afterDatetime, groupName, limit }})
+  const dataInCache = SessionCache.get(sessionStorage, { url, query, variables: { afterDatetime, groupName, limit }})
   if (dataInCache !== null)
     return Promise.resolve(dataInCache)
   return request(url, query, { afterDatetime, groupName, limit })
     .then((data) => {
-      SessionCache.add({ url, query, variables: { afterDatetime, groupName, limit }}, data)
+      SessionCache.add(sessionStorage, { url, query, variables: { afterDatetime, groupName, limit }}, data)
       return Promise.resolve(data)
     })
 }
diff --git a/source/connector-mobilizon/front/html-creator-test.js b/source/connector-mobilizon/front/html-creator-test.js
index 51ad679..d92bbdc 100644
--- a/source/connector-mobilizon/front/html-creator-test.js
+++ b/source/connector-mobilizon/front/html-creator-test.js
@@ -7,7 +7,7 @@ test.beforeEach(() => {
   global.document = new JSDOM().window.document
 })
 
-test('createAnchorElement() usual parameters', t => {
+test('#createAnchorElement usual parameters', t => {
   const a = HtmlCreator.createAnchorElement({ text: 'a', url: 'b' })
   t.is(a.tagName, 'A')
   t.is(a.innerHTML, 'a')
diff --git a/source/connector-mobilizon/front/object-hash-wrapper-test.js b/source/connector-mobilizon/front/object-hash-wrapper-test.js
index b7ac52d..554a9b6 100644
--- a/source/connector-mobilizon/front/object-hash-wrapper-test.js
+++ b/source/connector-mobilizon/front/object-hash-wrapper-test.js
@@ -1,5 +1,5 @@
 import test from 'ava'
-import { hash } from './object-hash-wrapper'
+import hash from './object-hash-wrapper'
 
 test('#hash object', t => {
   t.is(hash({foo: 'bar'}), 'a75c05bdca7d704bdfcd761913e5a4e4636e956b')
diff --git a/source/connector-mobilizon/front/session-cache-test.js b/source/connector-mobilizon/front/session-cache-test.js
new file mode 100644
index 0000000..eab90b2
--- /dev/null
+++ b/source/connector-mobilizon/front/session-cache-test.js
@@ -0,0 +1,34 @@
+import test from 'ava'
+import { SessionCache } from './session-cache'
+
+const fakeStorage = {
+
+  elements: {},
+
+  clear() {
+    this.elements = {}
+  },
+
+  getItem(key) {
+    const value = this.elements[key]
+    if (value === undefined) return null
+    return value
+  },
+
+  setItem(key, value) {
+    this.elements[key] = value
+  }
+}
+
+test.afterEach(() => {
+  fakeStorage.clear()
+})
+
+test('#add & #get', t => {
+  SessionCache.add(fakeStorage, { a: 'b' }, { c: 'd' })
+  t.deepEqual(SessionCache.get(fakeStorage, { a: 'b' }), { c: 'd' })
+})
+
+test('#get no entry', t => {
+  t.is(SessionCache.get(fakeStorage, { a: 'bb' }), null)
+})
diff --git a/source/connector-mobilizon/front/session-cache.js b/source/connector-mobilizon/front/session-cache.js
index 78d7383..7958090 100644
--- a/source/connector-mobilizon/front/session-cache.js
+++ b/source/connector-mobilizon/front/session-cache.js
@@ -4,20 +4,20 @@ const MAX_AGE_IN_MS = 120000
 
 export class SessionCache {
 
-  static add(parameters, data) {
+  static add(storage, parameters, data) {
     const key = hash(parameters)
     const timestamp = Date.now()
     const value = {
       data,
       timestamp,
     }
-    sessionStorage.setItem(key, JSON.stringify(value))
+    storage.setItem(key, JSON.stringify(value))
   }
 
-  static get(parameters) {
+  static get(storage, parameters) {
     const key = hash(parameters)
-    const value = JSON.parse(sessionStorage.getItem(key))
-    if (value.timestamp && value.timestamp > Date.now() - MAX_AGE_IN_MS)
+    const value = JSON.parse(storage.getItem(key))
+    if (value && value.timestamp && value.timestamp > Date.now() - MAX_AGE_IN_MS)
       return value.data
     return null
   }