Merge pull request #17642 from tmat/FlushOut

Flush console out before reading it

src/Scripting/CSharpTest/InteractiveSessionTests.cs

@@ -475,7 +475,7 @@ public void CompilationChain_GlobalImports()
         }
 
         [Fact]
-        public void CompilationChain_SubmissionSlotResize()
+        public async void CompilationChain_SubmissionSlotResize()
         {
             var state = CSharpScript.RunAsync("");
 
@@ -486,7 +486,7 @@ public void CompilationChain_SubmissionSlotResize()
 
             using (var redirect = new OutputRedirect(CultureInfo.InvariantCulture))
             {
-                state.ContinueWith(@"System.Console.WriteLine(i);").Wait();
+                await state.ContinueWith(@"System.Console.WriteLine(i);");
                 Assert.Equal(1, int.Parse(redirect.Output));
             }
         }
@@ -822,7 +822,7 @@ public void ExprStmtParenthesesUsedToOverrideDefaultEval()
 
         [WorkItem(5397, "DevDiv_Projects/Roslyn")]
         [Fact]
-        public void TopLevelLambda()
+        public async void TopLevelLambda()
         {
             var s = CSharpScript.RunAsync(@"
 using System;
@@ -835,7 +835,7 @@ public void TopLevelLambda()
 
             using (var redirect = new OutputRedirect(CultureInfo.InvariantCulture))
             {
-                s.ContinueWith(@"testDelB(""hello"");").Wait();
+                await s.ContinueWith(@"testDelB(""hello"");");
                 Assert.Equal("hello", redirect.Output.Trim());
             }
         }

src/Scripting/CoreTestUtilities/RedirectedOutput.cs

@@ -22,7 +22,14 @@ public OutputRedirect(IFormatProvider formatProvider)
             Console.SetOut(_newOut);
         }
 
-        public string Output => _newOut.ToString();
+        public string Output
+        {
+            get
+            {
+                _newOut.Flush();
+                return _newOut.ToString();
+            }
+        }
 
         void IDisposable.Dispose()
         {