fix(emulation): correctly report info for selected page

src/McpContext.ts

@@ -49,8 +49,8 @@ export class McpContext implements Context {
   #consoleCollector: PageCollector<ConsoleMessage | Error>;
 
   #isRunningTrace = false;
-  #networkConditions: string | null = null;
-  #cpuThrottlingRate = 1;
+  #networkConditionsMap = new WeakMap<Page, string>();
+  #cpuThrottlingRateMap = new WeakMap<Page, number>();
   #dialog?: Dialog;
 
   #nextSnapshotId = 1;
@@ -130,19 +130,27 @@ export class McpContext implements Context {
   }
 
   setNetworkConditions(conditions: string | null): void {
-    this.#networkConditions = conditions;
+    const page = this.getSelectedPage();
+    if (conditions === null) {
+      this.#networkConditionsMap.delete(page);
+    } else {
+      this.#networkConditionsMap.set(page, conditions);
+    }
   }
 
   getNetworkConditions(): string | null {
-    return this.#networkConditions;
+    const page = this.getSelectedPage();
+    return this.#networkConditionsMap.get(page) ?? null;
   }
 
   setCpuThrottlingRate(rate: number): void {
-    this.#cpuThrottlingRate = rate;
+    const page = this.getSelectedPage();
+    this.#cpuThrottlingRateMap.set(page, rate);
   }
 
   getCpuThrottlingRate(): number {
-    return this.#cpuThrottlingRate;
+    const page = this.getSelectedPage();
+    return this.#cpuThrottlingRateMap.get(page) ?? 1;
   }
 
   setIsRunningPerformanceTrace(x: boolean): void {

tests/tools/emulation.test.ts

@@ -57,6 +57,27 @@ describe('emulation', () => {
         assert.strictEqual(context.getNetworkConditions(), null);
       });
     });
+
+    it('report correctly for the currently selected page', async () => {
+      await withBrowser(async (response, context) => {
+        await context.newPage();
+        await emulateNetwork.handler(
+          {
+            params: {
+              throttlingOption: 'Slow 3G',
+            },
+          },
+          response,
+          context,
+        );
+
+        assert.strictEqual(context.getNetworkConditions(), 'Slow 3G');
+
+        context.setSelectedPageIdx(0);
+
+        assert.strictEqual(context.getNetworkConditions(), null);
+      });
+    });
   });
 
   describe('cpu', () => {
@@ -92,5 +113,26 @@ describe('emulation', () => {
         assert.strictEqual(context.getCpuThrottlingRate(), 1);
       });
     });
+
+    it('report correctly for the currently selected page', async () => {
+      await withBrowser(async (response, context) => {
+        await context.newPage();
+        await emulateCpu.handler(
+          {
+            params: {
+              throttlingRate: 4,
+            },
+          },
+          response,
+          context,
+        );
+
+        assert.strictEqual(context.getCpuThrottlingRate(), 4);
+
+        context.setSelectedPageIdx(0);
+
+        assert.strictEqual(context.getCpuThrottlingRate(), 1);
+      });
+    });
   });
 });