Test for quotation mark in format string parsing; closes #55

Author: zspitz

Tests.DotNetCore/FormatStringParsing.cs

@@ -60,5 +60,14 @@ public void MissingEndBraceEscapedEndBrace() {
             var ex = Assert.Throws<FormatException>(() => ParseFormatString("{0:}}"));
             Assert.Equal("Unexpected end of text", ex.Message);
         }
+
+        [Fact]
+        public void QuotationMarksInFormat() => RunTest(
+            @"""{0}""",
+            new List<(string, int?, int?, string)> {
+                ("\"", 0, null, null),
+                ("\"", null, null, null)
+            }
+        );
     }
 }

Visualizer.Shared/VisualizerData.cs

@@ -80,7 +80,7 @@ public VisualizerData() { }
 
         public VisualizerData(object o, VisualizerDataOptions options = null) {
             Options = options ?? new VisualizerDataOptions();
-            if (!options.Path.IsNullOrWhitespace()) {
+            if (!Options.Path.IsNullOrWhitespace()) {
                 o = (ResolvePath(o, options.Path) as Expression).ExtractValue();
             }
             Source = WriterBase.Create(o, Options.Formatter, Options.Language, out var pathSpans).ToString();