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diff --git a/browser/components/resistfingerprinting/test/browser/browser_hwconcurrency_iframes_aboutsrcdoc.js b/browser/components/resistfingerprinting/test/browser/browser_hwconcurrency_iframes_aboutsrcdoc.js
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+/**
+ * This test only tests values in an about:srcdoc document that is created by the iframe, it does not test them on the framer
+ *
+ * Covers the following cases:
+ * - RFP is disabled entirely
+ * - RFP is enabled entirely
+ * - FPP is enabled entirely
+
+ *
+ * - (A) RFP is exempted on the framer and framee and (if needed) on another cross-origin domain
+ * - (B) RFP is exempted on the framer and framee but is not on another (if needed) cross-origin domain
+ * - (C) RFP is exempted on the framer and (if needed) on another cross-origin domain, but not the framee
+ * - (D) RFP is exempted on the framer but not the framee nor another (if needed) cross-origin domain
+ * - (E) RFP is not exempted on the framer nor the framee but (if needed) is exempted on another cross-origin domain
+ * - (F) RFP is not exempted on the framer nor the framee nor another (if needed) cross-origin domain
+ * - (G) RFP is not exempted on the framer but is on the framee and (if needed) on another cross-origin domain
+ * - (H) RFP is not exempted on the framer nor another (if needed) cross-origin domain but is on the framee
+ *
+ */
+
+"use strict";
+
+const SPOOFED_HW_CONCURRENCY = 2;
+
+const DEFAULT_HARDWARE_CONCURRENCY = navigator.hardwareConcurrency;
+
+// =============================================================================================
+// =============================================================================================
+
+async function testHWConcurrency(result, expectedResults, extraData) {
+ let testDesc = extraData.testDesc;
+
+ is(
+ result.hardwareConcurrency,
+ expectedResults.hardwareConcurrency,
+ `Checking ${testDesc} navigator.hardwareConcurrency.`
+ );
+}
+
+// The following are convenience objects that allow you to quickly see what is
+// and is not modified from a logical set of values.
+// Be sure to always use `let expectedResults = structuredClone(allNotSpoofed)` to do a
+// deep copy and avoiding corrupting the original 'const' object
+const allNotSpoofed = {
+ hardwareConcurrency: DEFAULT_HARDWARE_CONCURRENCY,
+};
+const allSpoofed = {
+ hardwareConcurrency: SPOOFED_HW_CONCURRENCY,
+};
+
+const uri = `https://${FRAMER_DOMAIN}/browser/browser/components/resistfingerprinting/test/browser/file_hwconcurrency_aboutsrcdoc_iframer.html`;
+
+requestLongerTimeout(2);
+
+let expectedResults = {};
+
+expectedResults = structuredClone(allNotSpoofed);
+add_task(defaultsTest.bind(null, uri, testHWConcurrency, expectedResults));
+
+expectedResults = structuredClone(allSpoofed);
+add_task(simpleRFPTest.bind(null, uri, testHWConcurrency, expectedResults));
+
+expectedResults = structuredClone(allSpoofed);
+add_task(simpleFPPTest.bind(null, uri, testHWConcurrency, expectedResults));
+
+// (A) RFP is exempted on the framer and framee and (if needed) on another cross-origin domain
+expectedResults = structuredClone(allNotSpoofed);
+add_task(testA.bind(null, uri, testHWConcurrency, expectedResults));
+
+// (B) RFP is exempted on the framer and framee but is not on another (if needed) cross-origin domain
+expectedResults = structuredClone(allNotSpoofed);
+add_task(testB.bind(null, uri, testHWConcurrency, expectedResults));
+
+// (C) RFP is exempted on the framer and (if needed) on another cross-origin domain, but not the framee
+expectedResults = structuredClone(allSpoofed);
+add_task(testC.bind(null, uri, testHWConcurrency, expectedResults));
+
+// (D) RFP is exempted on the framer but not the framee nor another (if needed) cross-origin domain
+expectedResults = structuredClone(allSpoofed);
+add_task(testD.bind(null, uri, testHWConcurrency, expectedResults));
+
+// (E) RFP is not exempted on the framer nor the framee but (if needed) is exempted on another cross-origin domain
+expectedResults = structuredClone(allSpoofed);
+add_task(testE.bind(null, uri, testHWConcurrency, expectedResults));
+
+// (F) RFP is not exempted on the framer nor the framee nor another (if needed) cross-origin domain
+expectedResults = structuredClone(allSpoofed);
+add_task(testF.bind(null, uri, testHWConcurrency, expectedResults));
+
+// (G) RFP is not exempted on the framer but is on the framee and (if needed) on another cross-origin domain
+expectedResults = structuredClone(allSpoofed);
+add_task(testG.bind(null, uri, testHWConcurrency, expectedResults));
+
+// (H) RFP is not exempted on the framer nor another (if needed) cross-origin domain but is on the framee
+expectedResults = structuredClone(allSpoofed);
+add_task(testH.bind(null, uri, testHWConcurrency, expectedResults));