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diff --git a/browser/modules/test/unit/test_SiteDataManager.js b/browser/modules/test/unit/test_SiteDataManager.js
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+++ b/browser/modules/test/unit/test_SiteDataManager.js
@@ -0,0 +1,277 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+"use strict";
+
+const { SiteDataManager } = ChromeUtils.import(
+  "resource:///modules/SiteDataManager.jsm"
+);
+const { SiteDataTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/SiteDataTestUtils.sys.mjs"
+);
+const { PermissionTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PermissionTestUtils.sys.mjs"
+);
+
+const EXAMPLE_ORIGIN = "https://www.example.com";
+const EXAMPLE_ORIGIN_2 = "https://example.org";
+const EXAMPLE_ORIGIN_3 = "http://localhost:8000";
+
+let p =
+  Services.scriptSecurityManager.createContentPrincipalFromOrigin(
+    EXAMPLE_ORIGIN
+  );
+let partitionKey = `(${p.scheme},${p.baseDomain})`;
+let EXAMPLE_ORIGIN_2_PARTITIONED =
+  Services.scriptSecurityManager.createContentPrincipal(
+    Services.io.newURI(EXAMPLE_ORIGIN_2),
+    {
+      partitionKey,
+    }
+  ).origin;
+
+add_task(function setup() {
+  do_get_profile();
+});
+
+add_task(async function testGetSites() {
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN,
+    name: "foo1",
+    value: "bar1",
+  });
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN,
+    name: "foo2",
+    value: "bar2",
+  });
+
+  // Cookie of EXAMPLE_ORIGIN_2 partitioned under EXAMPLE_ORIGIN.
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN_2_PARTITIONED,
+    name: "foo3",
+    value: "bar3",
+  });
+  // IndexedDB storage of EXAMPLE_ORIGIN_2 partitioned under EXAMPLE_ORIGIN.
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN, 4096);
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN_2_PARTITIONED, 4096);
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN_2,
+    name: "foo",
+    value: "bar",
+  });
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN_2, 2048);
+  await SiteDataTestUtils.persist(EXAMPLE_ORIGIN_2);
+
+  await SiteDataManager.updateSites();
+
+  let sites = await SiteDataManager.getSites();
+
+  let site1 = sites.find(site => site.baseDomain == "example.com");
+  let site2 = sites.find(site => site.baseDomain == "example.org");
+
+  Assert.equal(
+    site1.baseDomain,
+    "example.com",
+    "Has the correct base domain for example.com"
+  );
+  // 4096 partitioned + 4096 unpartitioned.
+  Assert.greater(site1.usage, 4096 * 2, "Has correct usage for example.com");
+  Assert.equal(site1.persisted, false, "example.com is not persisted");
+  Assert.equal(
+    site1.cookies.length,
+    3, // 2 top level, 1 partitioned.
+    "Has correct number of cookies for example.com"
+  );
+  Assert.ok(
+    typeof site1.lastAccessed.getDate == "function",
+    "lastAccessed for example.com is a Date"
+  );
+  Assert.ok(
+    site1.lastAccessed > Date.now() - 60 * 1000,
+    "lastAccessed for example.com happened recently"
+  );
+
+  Assert.equal(
+    site2.baseDomain,
+    "example.org",
+    "Has the correct base domain for example.org"
+  );
+  Assert.greater(site2.usage, 2048, "Has correct usage for example.org");
+  Assert.equal(site2.persisted, true, "example.org is persisted");
+  Assert.equal(
+    site2.cookies.length,
+    1,
+    "Has correct number of cookies for example.org"
+  );
+  Assert.ok(
+    typeof site2.lastAccessed.getDate == "function",
+    "lastAccessed for example.org is a Date"
+  );
+  Assert.ok(
+    site2.lastAccessed > Date.now() - 60 * 1000,
+    "lastAccessed for example.org happened recently"
+  );
+
+  await SiteDataTestUtils.clear();
+});
+
+add_task(async function testGetTotalUsage() {
+  await SiteDataManager.updateSites();
+  let sites = await SiteDataManager.getSites();
+  Assert.equal(sites.length, 0, "SiteDataManager is empty");
+
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN, 4096);
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN_2, 2048);
+
+  await SiteDataManager.updateSites();
+
+  let usage = await SiteDataManager.getTotalUsage();
+
+  Assert.greater(usage, 4096 + 2048, "Has the correct total usage.");
+
+  await SiteDataTestUtils.clear();
+});
+
+add_task(async function testRemove() {
+  await SiteDataManager.updateSites();
+
+  let uri = Services.io.newURI(EXAMPLE_ORIGIN);
+  PermissionTestUtils.add(uri, "camera", Services.perms.ALLOW_ACTION);
+
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN,
+    name: "foo1",
+    value: "bar1",
+  });
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN,
+    name: "foo2",
+    value: "bar2",
+  });
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN_2_PARTITIONED,
+    name: "foo3",
+    value: "bar3",
+  });
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN, 4096);
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN_2_PARTITIONED, 4096);
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN_2,
+    name: "foo",
+    value: "bar",
+  });
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN_2, 2048);
+  await SiteDataTestUtils.persist(EXAMPLE_ORIGIN_2);
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN_3, 2048);
+
+  await SiteDataManager.updateSites();
+
+  let sites = await SiteDataManager.getSites();
+
+  Assert.equal(sites.length, 3, "Has three sites.");
+
+  await SiteDataManager.remove("localhost");
+
+  sites = await SiteDataManager.getSites();
+
+  Assert.equal(sites.length, 2, "Has two sites.");
+
+  await SiteDataManager.remove(["www.example.com"]);
+
+  sites = await SiteDataManager.getSites();
+
+  Assert.equal(sites.length, 1, "Has one site.");
+  Assert.equal(
+    sites[0].baseDomain,
+    "example.org",
+    "Has not cleared data for example.org"
+  );
+
+  let usage = await SiteDataTestUtils.getQuotaUsage(EXAMPLE_ORIGIN);
+  Assert.equal(usage, 0, "Has cleared quota usage for example.com");
+
+  let cookies = Services.cookies.countCookiesFromHost("example.com");
+  Assert.equal(cookies, 0, "Has cleared cookies for example.com");
+
+  let perm = PermissionTestUtils.testPermission(uri, "persistent-storage");
+  Assert.equal(
+    perm,
+    Services.perms.UNKNOWN_ACTION,
+    "Cleared the persistent-storage permission."
+  );
+  perm = PermissionTestUtils.testPermission(uri, "camera");
+  Assert.equal(
+    perm,
+    Services.perms.ALLOW_ACTION,
+    "Did not clear other permissions."
+  );
+
+  PermissionTestUtils.remove(uri, "camera");
+});
+
+add_task(async function testRemoveSiteData() {
+  let uri = Services.io.newURI(EXAMPLE_ORIGIN);
+  PermissionTestUtils.add(uri, "camera", Services.perms.ALLOW_ACTION);
+
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN,
+    name: "foo1",
+    value: "bar1",
+  });
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN,
+    name: "foo2",
+    value: "bar2",
+  });
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN_2_PARTITIONED,
+    name: "foo3",
+    value: "bar3",
+  });
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN, 4096);
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN_2_PARTITIONED, 4096);
+  SiteDataTestUtils.addToCookies({
+    origin: EXAMPLE_ORIGIN_2,
+    name: "foo",
+    value: "bar",
+  });
+  await SiteDataTestUtils.addToIndexedDB(EXAMPLE_ORIGIN_2, 2048);
+  await SiteDataTestUtils.persist(EXAMPLE_ORIGIN_2);
+
+  await SiteDataManager.updateSites();
+
+  let sites = await SiteDataManager.getSites();
+
+  Assert.equal(sites.length, 2, "Has two sites.");
+
+  await SiteDataManager.removeSiteData();
+
+  sites = await SiteDataManager.getSites();
+
+  Assert.equal(sites.length, 0, "Has no sites.");
+
+  let usage = await SiteDataTestUtils.getQuotaUsage(EXAMPLE_ORIGIN);
+  Assert.equal(usage, 0, "Has cleared quota usage for example.com");
+
+  usage = await SiteDataTestUtils.getQuotaUsage(EXAMPLE_ORIGIN_2);
+  Assert.equal(usage, 0, "Has cleared quota usage for example.org");
+
+  let cookies = Services.cookies.countCookiesFromHost("example.org");
+  Assert.equal(cookies, 0, "Has cleared cookies for example.org");
+
+  let perm = PermissionTestUtils.testPermission(uri, "persistent-storage");
+  Assert.equal(
+    perm,
+    Services.perms.UNKNOWN_ACTION,
+    "Cleared the persistent-storage permission."
+  );
+  perm = PermissionTestUtils.testPermission(uri, "camera");
+  Assert.equal(
+    perm,
+    Services.perms.ALLOW_ACTION,
+    "Did not clear other permissions."
+  );
+
+  PermissionTestUtils.remove(uri, "camera");
+});