1 files changed, 115 insertions, 0 deletions
diff --git a/gfx/tests/browser/browser_native_font_cache_macos.js b/gfx/tests/browser/browser_native_font_cache_macos.js
new file mode 100644
index 0000000000..919a5c7a72
--- /dev/null
+++ b/gfx/tests/browser/browser_native_font_cache_macos.js
@@ -0,0 +1,115 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async () => {
+  // Create a tab that loads a system font.
+  const CROSS_ORIGIN_DOMAIN = "https://example.com";
+  const TARGET_URL = `${CROSS_ORIGIN_DOMAIN}/browser/gfx/tests/browser/file_native_font_cache_macos.html`;
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: TARGET_URL },
+    async browser => {
+      await SpecialPowers.spawn(browser, [], async () => {
+        // Capture a snapshot of the tab, which will load the system font in the
+        // parent process.
+        const TARGET_WIDTH = 200;
+        const TARGET_HEIGHT = 100;
+
+        const rect = new content.window.DOMRect(
+          0,
+          0,
+          TARGET_WIDTH,
+          TARGET_HEIGHT
+        );
+        await SpecialPowers.snapshotContext(content.window, rect, "white");
+      });
+    }
+  );
+
+  // Now create a tab that shows the memory reporter.
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:memory" },
+    async browser => {
+      // Click the "Measure" button.
+      await SpecialPowers.spawn(browser, [], () => {
+        let measureButton = content.document.getElementById("measureButton");
+        measureButton.click();
+      });
+
+      // Copy the page text and check for an expected start with string.
+      let copiedText = await new Promise(resolve => {
+        const REPORT_TIMEOUT_MS = 15 * 1e3;
+        const EXPECTED_START_WITH = "Main Process";
+        let mostRecentTextOnClipboard = "";
+
+        SimpleTest.waitForClipboard(
+          textOnClipboard => {
+            mostRecentTextOnClipboard = textOnClipboard;
+            const gotExpected = textOnClipboard.startsWith(EXPECTED_START_WITH);
+            if (!gotExpected) {
+              // Try copying again.
+              EventUtils.synthesizeKey("A", { accelKey: true });
+              EventUtils.synthesizeKey("C", { accelKey: true });
+            }
+            return gotExpected;
+          },
+          () => {
+            EventUtils.synthesizeKey("A", { accelKey: true });
+            EventUtils.synthesizeKey("C", { accelKey: true });
+          },
+          () => {
+            resolve(mostRecentTextOnClipboard);
+          },
+          () => {
+            info(`Didn't find expected text within ${REPORT_TIMEOUT_MS}ms.`);
+            dump("*******ACTUAL*******\n");
+            dump("<<<" + mostRecentTextOnClipboard + ">>>\n");
+            dump("********************\n");
+            resolve("");
+          },
+          "text/plain",
+          REPORT_TIMEOUT_MS
+        );
+      });
+
+      isnot(copiedText, "", "Got some text from clipboard.");
+
+      // Search the copied text for our desired pattern. Initially, check for
+      // a line with "native-font-resource-mac". If that exists, ensure that it
+      // has less than a maximum MB. If that doesn't exist, check instead for
+      // a line with "gfx" before the "Other Measurements" section. If that
+      // exists, it is tested against the same MB limit. If it doesn't exist,
+      // that is an indication that "gfx" doesn't occur in the first section
+      // "Explicit Allocations', and therefore isn't holding memory at all.
+      const MB_EXCLUSIVE_MAX = 20;
+      const nfrm_line = /^.*?(\d+)\.\d+ MB.*-- native-font-resource-mac/m;
+      const nfrm_match = nfrm_line.exec(copiedText);
+      if (nfrm_match) {
+        const nfrm_mb = nfrm_match[1];
+        ok(
+          nfrm_mb < MB_EXCLUSIVE_MAX,
+          `native-font-resource-mac ${nfrm_mb} MB should be less than ${MB_EXCLUSIVE_MAX} MB.`
+        );
+      } else {
+        // Figure out where the "Other Measurements" section begins.
+        const om_line = /^Other Measurements$/m;
+        const om_match = om_line.exec(copiedText);
+
+        // Find the first gfx line, and if it occurs before the "Other
+        // Measurements" section, check its size.
+        const gfx_line = /^.*?(\d+)\.\d+ MB.*-- gfx/m;
+        const gfx_match = gfx_line.exec(copiedText);
+        if (gfx_match && gfx_match.index < om_match.index) {
+          const gfx_mb = gfx_match[1];
+          ok(
+            gfx_mb < MB_EXCLUSIVE_MAX,
+            `Explicit Allocations gfx ${gfx_mb} MB should be less than ${MB_EXCLUSIVE_MAX} MB.`
+          );
+        } else {
+          ok(true, "Explicit Allocations gfx is not listed.");
+        }
+      }
+    }
+  );
+});