1 files changed, 168 insertions, 0 deletions
diff --git a/toolkit/components/processtools/tests/browser/browser_test_procinfo.js b/toolkit/components/processtools/tests/browser/browser_test_procinfo.js
new file mode 100644
index 0000000000..673864bdd0
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+++ b/toolkit/components/processtools/tests/browser/browser_test_procinfo.js
@@ -0,0 +1,168 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+const DUMMY_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "http://example.com"
+  ) + "/dummy.html";
+
+const { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+const HAS_THREAD_NAMES =
+  AppConstants.platform != "win" ||
+  AppConstants.isPlatformAndVersionAtLeast("win", 10);
+const isFissionEnabled = SpecialPowers.useRemoteSubframes;
+
+const SAMPLE_SIZE = 10;
+const NS_PER_MS = 1000000;
+
+function checkProcessCpuTime(proc) {
+  Assert.greater(proc.cpuTime, 0, "Got some cpu time");
+
+  let cpuThreads = 0;
+  for (let thread of proc.threads) {
+    cpuThreads += Math.floor(thread.cpuTime / NS_PER_MS);
+  }
+  Assert.greater(cpuThreads, 0, "Got some cpu time in the threads");
+  let processCpuTime = Math.ceil(proc.cpuTime / NS_PER_MS);
+  if (AppConstants.platform == "win" && processCpuTime < cpuThreads) {
+    // On Windows, our test jobs likely run in VMs without constant TSC,
+    // so we might have low precision CPU time measurements.
+    const MAX_DISCREPENCY = 100;
+    Assert.ok(
+      cpuThreads - processCpuTime < MAX_DISCREPENCY,
+      `on Windows, we accept a discrepency of up to ${MAX_DISCREPENCY}ms between the process CPU time and the sum of its threads' CPU time, process CPU time: ${processCpuTime}, sum of thread CPU time: ${cpuThreads}`
+    );
+  } else {
+    Assert.greaterOrEqual(
+      processCpuTime,
+      cpuThreads,
+      "The total CPU time of the process should be at least the sum of the CPU time spent by the still alive threads"
+    );
+  }
+}
+
+add_task(async function test_proc_info() {
+  // Open a few `about:home` tabs, they'll end up in `privilegedabout`.
+  let tabsAboutHome = [];
+  for (let i = 0; i < 5; ++i) {
+    let tab = BrowserTestUtils.addTab(gBrowser, "about:home");
+    tabsAboutHome.push(tab);
+    gBrowser.selectedTab = tab;
+    await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  }
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: DUMMY_URL },
+    async function(browser) {
+      // We test `SAMPLE_SIZE` times to increase a tad the chance of encountering race conditions.
+      for (let z = 0; z < SAMPLE_SIZE; z++) {
+        let parentProc = await ChromeUtils.requestProcInfo();
+
+        Assert.equal(
+          parentProc.type,
+          "browser",
+          "Parent proc type should be browser"
+        );
+
+        checkProcessCpuTime(parentProc);
+
+        // Under Windows, thread names appeared with Windows 10.
+        if (HAS_THREAD_NAMES) {
+          Assert.ok(
+            parentProc.threads.some(thread => thread.name),
+            "At least one of the threads of the parent process is named"
+          );
+        }
+
+        Assert.ok(parentProc.memory > 0, "Memory was set");
+
+        // While it's very unlikely that the parent will disappear while we're running
+        // tests, some children can easily vanish. So we go twice through the list of
+        // children. Once to test stuff that all process data respects the invariants
+        // that don't care whether we have a race condition and once to test that at
+        // least one well-known process that should not be able to vanish during
+        // the test respects all the invariants.
+        for (let childProc of parentProc.children) {
+          Assert.notEqual(
+            childProc.type,
+            "browser",
+            "Child proc type should not be browser"
+          );
+
+          // We set the `childID` for child processes that have a `ContentParent`/`ContentChild`
+          // actor hierarchy.
+          if (childProc.type.startsWith("web")) {
+            Assert.notEqual(
+              childProc.childID,
+              0,
+              "Child proc should have been set"
+            );
+          }
+          Assert.notEqual(
+            childProc.type,
+            "unknown",
+            "Child proc type should be known"
+          );
+          if (childProc.type == "webIsolated") {
+            Assert.notEqual(
+              childProc.origin || "",
+              "",
+              "Child process should have an origin"
+            );
+          }
+
+          checkProcessCpuTime(childProc);
+        }
+
+        // We only check other properties on the `privilegedabout` subprocess, which
+        // as of this writing is always active and available.
+        var hasPrivilegedAbout = false;
+        var numberOfAboutTabs = 0;
+        for (let childProc of parentProc.children) {
+          if (childProc.type != "privilegedabout") {
+            continue;
+          }
+          hasPrivilegedAbout = true;
+          Assert.ok(childProc.memory > 0, "Memory was set");
+
+          for (var win of childProc.windows) {
+            if (win.documentURI.spec != "about:home") {
+              // We're only interested in about:home for this test.
+              continue;
+            }
+            numberOfAboutTabs++;
+            Assert.ok(
+              win.outerWindowId > 0,
+              `ContentParentID should be > 0 ${win.outerWindowId}`
+            );
+            if (win.documentTitle) {
+              // Unfortunately, we sometimes reach this point before the document is fully loaded, so
+              // `win.documentTitle` may still be empty.
+              Assert.equal(win.documentTitle, "New Tab");
+            }
+          }
+          Assert.ok(
+            numberOfAboutTabs >= tabsAboutHome.length,
+            "We have found at least as many about:home tabs as we opened"
+          );
+
+          // Once we have verified the privileged about process, bailout.
+          break;
+        }
+
+        Assert.ok(
+          hasPrivilegedAbout,
+          "We have found the privileged about process"
+        );
+      }
+
+      for (let tab of tabsAboutHome) {
+        BrowserTestUtils.removeTab(tab);
+      }
+    }
+  );
+});