Test that if the saveLocale Method is called the mocked apollo call is send.

frontend/src/components/LanguageSwitch.spec.js

@@ -3,6 +3,16 @@ import LanguageSwitch from './LanguageSwitch'
 
 const localVue = global.localVue
 
+const updateUserInfosQueryMock = jest.fn().mockResolvedValue({
+  data: {
+    updateUserInfos: {
+      sessionId: 1234,
+      email: 'he@ho.he',
+      locale: 'de',
+    },
+  },
+})
+
 describe('LanguageSwitch', () => {
   let wrapper
 
@@ -20,6 +30,9 @@ describe('LanguageSwitch', () => {
     $i18n: {
       locale: 'en',
     },
+    $apollo: {
+      query: updateUserInfosQueryMock,
+    },
   }
 
   const Wrapper = () => {
@@ -91,5 +104,33 @@ describe('LanguageSwitch', () => {
         })
       })
     })
+
+    describe('calls the API', () => {
+      it("with locale 'en'", () => {
+        wrapper.vm.saveLocale('en')
+        expect(updateUserInfosQueryMock).toBeCalledWith(
+          expect.objectContaining({
+            variables: {
+              sessionId: 1234,
+              email: 'he@ho.he',
+              locale: 'en',
+            },
+          }),
+        )
+      })
+
+      it("with locale 'de'", () => {
+        wrapper.vm.saveLocale('de')
+        expect(updateUserInfosQueryMock).toBeCalledWith(
+          expect.objectContaining({
+            variables: {
+              sessionId: 1234,
+              email: 'he@ho.he',
+              locale: 'de',
+            },
+          }),
+        )
+      })
+    })
   })
 })