/**

 * Test that session history's expiration tracker would remove bfcache on

 * expiration.

 */

// With bfcache not expired.

add_task(async function testValidCache() {

  // Make an unrealistic large timeout.

  await SpecialPowers.pushPrefEnv({

    set: [["browser.sessionhistory.contentViewerTimeout", 86400]]

  });

  await BrowserTestUtils.withNewTab(

    {gBrowser, url: "data:text/html;charset=utf-8,page1"},

    async function(browser) {

      // Make a simple modification for bfcache testing.

      await ContentTask.spawn(browser, null, () => {

        content.document.body.textContent = "modified";

      });

      // Load a random page.

      BrowserTestUtils.loadURI(browser, "data:text/html;charset=utf-8,page2");

      await BrowserTestUtils.browserLoaded(browser);

      // Go back and verify text content.

      let awaitPageShow = BrowserTestUtils.waitForContentEvent(browser, "pageshow");

      browser.goBack();

      await awaitPageShow;

      await ContentTask.spawn(browser, null, () => {

        is(content.document.body.textContent, "modified");

      });

    });

});

// With bfcache expired.

add_task(async function testExpiredCache() {

  // Make bfcache timeout in 1 sec.

  await SpecialPowers.pushPrefEnv({

    set: [["browser.sessionhistory.contentViewerTimeout", 1]]

  });

  await BrowserTestUtils.withNewTab(

    {gBrowser, url: "data:text/html;charset=utf-8,page1"},

    async function(browser) {

      // Make a simple modification for bfcache testing.

      await ContentTask.spawn(browser, null, () => {

        content.document.body.textContent = "modified";

      });

      // Load a random page.

      BrowserTestUtils.loadURI(browser, "data:text/html;charset=utf-8,page2");

      await BrowserTestUtils.browserLoaded(browser);

      // Wait for 3 times of expiration timeout, hopefully it's evicted...

      await ContentTask.spawn(browser, null, () => {

        return new Promise(resolve => {

          content.setTimeout(resolve, 3000);

        });

      });

      // Go back and verify text content.

      let awaitPageShow = BrowserTestUtils.waitForContentEvent(browser, "pageshow");

      browser.goBack();

      await awaitPageShow;

      await ContentTask.spawn(browser, null, () => {

        is(content.document.body.textContent, "page1");

      });

    });

});