Tests are crashing due to NUnit bug: nunit/nunit3-vs-adapter#691

Nunit bug is that InlineData in strings need to have balanced quotes.
Update test case. This shouldn't lose coverage since the quote comes after the intellisense cursor.

src/tests/Microsoft.PowerFx.Core.Tests/IntellisenseTests/SuggestTest.cs

@@ -71,8 +71,8 @@ private class EmptyEnumStore : EnumStore
         // DottedNameNodeSuggestionHandler
         [InlineData("{a:{},b:{},c:{}}.|", "a", "b", "c")]
         [InlineData("$\"Hello { First(Table({a:{},b:{},c:{}})).| } World\"", "a", "b", "c")]
-        [InlineData("$\"Hello { First(Table({a:{},b:{},c:{}})).|", "a", "b", "c")]
-        [InlineData("$\"Hello { {a:{},b:{},c:{}}.|", "a", "b", "c")]
+        [InlineData("$\"Hello { First(Table({a:{},b:{},c:{}})).|   \"", "a", "b", "c")]
+        [InlineData("$\"Hello { {a:{},b:{},c:{}}.|  \"", "a", "b", "c")]
         [InlineData("$ |")]
         [InlineData("$\"foo {|")]
         [InlineData("{abc:{},ab:{},a:{}}.|ab", "ab", "a", "abc")]
@@ -151,6 +151,9 @@ private class EmptyEnumStore : EnumStore
         [InlineData("$\"Hello {DisplayMode|} World!\"", "DisplayMode", "DisplayMode.Disabled", "DisplayMode.Edit", "DisplayMode.View")]
         public void TestSuggest(string expression, params string[] expectedSuggestions)
         {
+            // Note that the expression string needs to have balanced quotes or we hit a bug in NUnit running the tests:
+            //   https://github.com/nunit/nunit3-vs-adapter/issues/691
+
             FeatureFlags.StringInterpolation = true;
             var actualSuggestions = SuggestStrings(expression, _defaultEnumStore);
             Assert.Equal(expectedSuggestions, actualSuggestions);