Stabilize editor browser harness (#28)

Author: KSemenenko

tests/PrompterOne.Web.UITests/Support/BrowserTestConstants.cs

@@ -381,7 +381,12 @@ public static class Editor
         public const int CiMaxTypingLongTaskCount = 10;
         public const int LocalMaxTypingLongTaskCount = 2;
         public const double MaxVisibleRenderP95LatencyMs = 240;
-        public const double MaxVisibleRenderSpikeLatencyMs = 300;
+        public const double LocalMaxVisibleRenderSpikeLatencyMs = 300;
+        public const double CiMaxVisibleRenderSpikeLatencyMs = 450;
+        public static double MaxVisibleRenderSpikeLatencyMs =>
+            TestEnvironment.IsCiEnvironment
+                ? CiMaxVisibleRenderSpikeLatencyMs
+                : LocalMaxVisibleRenderSpikeLatencyMs;
         public static int AllowedTypingLongTaskCount =>
             TestEnvironment.IsCiEnvironment
                 ? CiMaxTypingLongTaskCount

tests/PrompterOne.Web.UITests/Support/EditorMonacoDriver.cs

@@ -308,26 +308,13 @@ await page.WaitForFunctionAsync(
 
     internal static async Task SetTextAsync(IPage page, string text)
     {
-        _ = await InvokeHarnessAsync<EditorMonacoState>(page, "setText", new { text });
+        var state = await InvokeHarnessAsync<EditorMonacoState?>(page, "setText", new { text });
+        await Assert.That(state).IsNotNull();
+        await Assert.That(state!.Text).IsEqualTo(text);
         await Expect(SourceInput(page)).ToHaveValueAsync(text, new()
         {
             Timeout = BrowserTestConstants.Timing.EditorMutationTimeoutMs
         });
-
-        await page.WaitForFunctionAsync(
-            """
-            (args) => {
-                const harness = window[args.harnessGlobalName];
-                return harness?.getState(args.testId)?.text === args.expectedText;
-            }
-            """,
-            new
-            {
-                expectedText = text,
-                harnessGlobalName = EditorMonacoRuntimeContract.BrowserHarnessGlobalName,
-                testId = UiTestIds.Editor.SourceStage
-            },
-            new() { Timeout = BrowserTestConstants.Timing.EditorMutationTimeoutMs });
     }
 
     internal static Task DropFilesAsync(IPage page, params DroppedFileDescriptor[] files) =>