First store tests \o/ :party:

front/test/unit/specs/store/auth.spec.js

+import store from '@/store/player'
+
+describe('mutations', () => {
+  it('set volume', () => {
+    // mock state
+    const state = { volume: 0 }
+    // apply mutation
+    store.mutations.volume(state, 0.9)
+    // assert result
+    expect(state.volume).to.equal(0.9)
+  })
+  it('set volume max 1', () => {
+    // mock state
+    const state = { volume: 0 }
+    // apply mutation
+    store.mutations.volume(state, 2)
+    // assert result
+    expect(state.volume).to.equal(1)
+  })
+  it('set volume min to 0', () => {
+    // mock state
+    const state = { volume: 0.5 }
+    // apply mutation
+    store.mutations.volume(state, -2)
+    // assert result
+    expect(state.volume).to.equal(0)
+  })
+  it('increment volume', () => {
+    // mock state
+    const state = { volume: 0 }
+    // apply mutation
+    store.mutations.incrementVolume(state, 0.1)
+    // assert result
+    expect(state.volume).to.equal(0.1)
+  })
+  it('increment volume max 1', () => {
+    // mock state
+    const state = { volume: 0 }
+    // apply mutation
+    store.mutations.incrementVolume(state, 2)
+    // assert result
+    expect(state.volume).to.equal(1)
+  })
+  it('increment volume min to 0', () => {
+    // mock state
+    const state = { volume: 0.5 }
+    // apply mutation
+    store.mutations.incrementVolume(state, -2)
+    // assert result
+    expect(state.volume).to.equal(0)
+  })
+})