Add tests for 'skipPollOnFocusLost' option

New test cases have been added for the 'skipPollOnFocusLost' option in query polling. Specifically, these tests verify the correct behaviour when this option is toggled, when it's reset on mount, and when it's changed via subscription options update.

packages/toolkit/src/query/tests/polling.test.tsx

@@ -122,4 +122,85 @@ describe('polling tests', () => {
 
     expect(mockBaseQuery.mock.calls.length).toBeGreaterThanOrEqual(2)
   })
+
+  it('respects skipPollOnFocusLost', async () => {
+    storeRef.store.dispatch(
+      getPosts.initiate(1, {
+        subscriptionOptions: { pollingInterval: 10, skipPollOnFocusLost: true },
+        subscribe: true,
+      })
+    )
+
+    await delay(20)
+    const callsWithSkip = mockBaseQuery.mock.calls.length
+
+    storeRef.store.dispatch(
+      getPosts.initiate(1, {
+        subscriptionOptions: {
+          pollingInterval: 10,
+          skipPollOnFocusLost: false,
+        },
+        subscribe: true,
+      })
+    )
+
+    await delay(30)
+    const callsWithoutSkip = mockBaseQuery.mock.calls.length
+
+    expect(callsWithSkip).toBe(1)
+    expect(callsWithoutSkip).toBeGreaterThan(2)
+  })
+
+  it('replaces skipPollOnFocusLost with most recent mount', async () => {
+    storeRef.store.dispatch(
+      getPosts.initiate(1, {
+        subscriptionOptions: {
+          pollingInterval: 10,
+          skipPollOnFocusLost: false,
+        },
+        subscribe: true,
+      })
+    )
+
+    await delay(50)
+    const callsWithSkip = mockBaseQuery.mock.calls.length
+
+    storeRef.store.dispatch(
+      getPosts.initiate(1, {
+        subscriptionOptions: { pollingInterval: 15, skipPollOnFocusLost: true },
+        subscribe: true,
+      })
+    )
+
+    await delay(50)
+    const callsWithoutSkip = mockBaseQuery.mock.calls.length
+
+    expect(callsWithSkip).toBeGreaterThan(2)
+    expect(callsWithoutSkip).toBe(callsWithSkip + 1)
+  })
+
+  it('replaces skipPollOnFocusLost when the subscription options are updated', async () => {
+    const { requestId, queryCacheKey, ...subscription } =
+      storeRef.store.dispatch(
+        getPosts.initiate(1, {
+          subscriptionOptions: { pollingInterval: 10 },
+          subscribe: true,
+        })
+      )
+
+    const getSubs = createSubscriptionGetter(queryCacheKey)
+
+    await delay(1)
+    expect(Object.keys(getSubs())).toHaveLength(1)
+    expect(getSubs()[requestId].skipPollOnFocusLost).toBe(false)
+
+    subscription.updateSubscriptionOptions({
+      pollingInterval: 20,
+      skipPollOnFocusLost: true,
+    })
+
+    await delay(1)
+    expect(Object.keys(getSubs())).toHaveLength(1)
+    expect(getSubs()[requestId].skipPollOnFocusLost).toBe(true)
+  })
 })