[dotnet] Correct assertion of struct type in internal tests (SeleniumHQ#14878)

Author: RenderMichael

dotnet/test/common/DevTools/DevToolsProfilerTest.cs

@@ -131,12 +131,12 @@ private void ValidateProfile(CurrentCdpVersion.Profiler.Profile profiler)
         {
             Assert.That(profiler, Is.Not.Null);
             Assert.That(profiler.Nodes, Is.Not.Null);
-            Assert.That(profiler.StartTime, Is.Not.Null);
-            Assert.That(profiler.EndTime, Is.Not.Null);
+            Assert.That(profiler.StartTime, Is.Not.Zero);
+            Assert.That(profiler.EndTime, Is.Not.Zero);
             Assert.That(profiler.TimeDeltas, Is.Not.Null);
             foreach (var delta in profiler.TimeDeltas)
             {
-                Assert.That(delta, Is.Not.Null);
+                Assert.That(delta, Is.Not.Zero);
             }
 
             foreach (var node in profiler.Nodes)

dotnet/test/common/DevTools/DevToolsTestFixture.cs

@@ -39,7 +39,7 @@ public void Setup()
             devTools = driver as IDevTools;
             if (devTools == null)
             {
-                Assert.Ignore("{0} does not support Chrome DevTools Protocol", EnvironmentManager.Instance.Browser);
+                Assert.Ignore($"{EnvironmentManager.Instance.Browser} does not support Chrome DevTools Protocol");
                 return;
             }