Make DiagnosticsForVerificationTimeoutHasNameAsRange stable (dafny-la…

…ng#4528)

### Changes
Prevent unit test failures by not relying on an absolute time limit but
a resource limit instead.

### Testing
Changes are to a test

<small>By submitting this pull request, I confirm that my contribution
is made under the terms of the [MIT
license](https://github.com/dafny-lang/dafny/blob/master/LICENSE.txt).</small>

Source/DafnyLanguageServer.Test/DafnyLanguageServerTestBase.cs

@@ -26,7 +26,7 @@ namespace Microsoft.Dafny.LanguageServer.IntegrationTest {
   public class DafnyLanguageServerTestBase : LanguageProtocolTestBase {
 
     protected readonly string SlowToVerify = @"
-lemma {:timeLimit 1} SquareRoot2NotRational(p: nat, q: nat)
+lemma {:rlimit 100} SquareRoot2NotRational(p: nat, q: nat)
   requires p > 0 && q > 0
   ensures (p * p) !=  2 * (q * q)
 { 

Source/DafnyLanguageServer.Test/Synchronization/DiagnosticsTest.cs

@@ -90,8 +90,8 @@ public async Task DiagnosticsForVerificationTimeoutHasNameAsRange() {
       var documentItem = CreateTestDocument(SlowToVerify, "DiagnosticsForVerificationTimeout.dfy");
       await client.OpenDocumentAndWaitAsync(documentItem, CancellationToken);
       var diagnostics = await GetLastDiagnostics(documentItem, CancellationToken);
-      Assert.Contains("timed out", diagnostics[0].Message);
-      Assert.Equal(new Range(0, 21, 0, 43), diagnostics[0].Range);
+      Assert.Contains("Verification out of resource", diagnostics[0].Message);
+      Assert.Equal(new Range(0, 20, 0, 42), diagnostics[0].Range);
     }
 
     [Fact]

Source/DafnyLanguageServer.Test/Synchronization/VerificationStatusTest.cs

@@ -367,7 +367,7 @@ await SetUp(options => {
 
     var successfulRun = await client.RunSymbolVerification(new TextDocumentIdentifier(documentItem.Uri), methodHeader, CancellationToken);
     Assert.True(successfulRun);
-    var range = new Range(0, 21, 0, 43);
+    var range = new Range(0, 20, 0, 42);
     await WaitForStatus(range, PublishedVerificationStatus.Running, CancellationToken);
     await WaitForStatus(range, PublishedVerificationStatus.Error, CancellationToken);