add or update test code for 'nullable', 'record' and 'init'

Author: kmycode

tests/languages/csharp/issue2991.test

@@ -0,0 +1,52 @@
+record TestData
+{
+  public string Name { get; init; }
+  public void Func()
+  {
+  }
+}
+
+record TestData(string Name);
+
+----------------------------------------------------
+
+[
+	["keyword", "record"],
+	["class-name", ["TestData"]],
+
+	["punctuation", "{"],
+
+	["keyword", "public"],
+	["return-type", [
+		["keyword", "string"]
+	]],
+	" Name ",
+	["punctuation", "{"],
+	["keyword", "get"],
+	["punctuation", ";"],
+	["keyword", "init"],
+	["punctuation", ";"],
+	["punctuation", "}"],
+
+	["keyword", "public"],
+	["return-type", [
+		["keyword", "void"]
+	]],
+	["function", "Func"],
+	["punctuation", "("],
+	["punctuation", ")"],
+	["punctuation", "{"],
+	["punctuation", "}"],
+
+	["punctuation", "}"],
+
+	["keyword", "record"],
+	["class-name", ["TestData"]],
+	["punctuation", "("],
+	["class-name", [
+		["keyword", "string"]
+	]],
+	" Name",
+	["punctuation", ")"],
+	["punctuation", ";"]
+]

tests/languages/csharp/keyword_feature.test

@@ -43,6 +43,7 @@ group
 if
 implicit
 in
+init;
 int;
 interface;
 internal
@@ -71,6 +72,7 @@ private
 protected
 public
 readonly
+record;
 ref
 remove
 return
@@ -154,6 +156,7 @@ yield
 	["keyword", "if"],
 	["keyword", "implicit"],
 	["keyword", "in"],
+	["keyword", "init"], ["punctuation", ";"],
 	["keyword", "int"], ["punctuation", ";"],
 	["keyword", "interface"], ["punctuation", ";"],
 	["keyword", "internal"],
@@ -182,6 +185,7 @@ yield
 	["keyword", "protected"],
 	["keyword", "public"],
 	["keyword", "readonly"],
+	["keyword", "record"], ["punctuation", ";"],
 	["keyword", "ref"],
 	["keyword", "remove"],
 	["keyword", "return"],

tests/languages/csharp/preprocessor_feature.test

@@ -7,6 +7,7 @@
 #endregion
 #error
 #line
+#nullable
 #pragma
 #region
 #undef
@@ -24,6 +25,7 @@
 	["preprocessor", ["#", ["directive", "endregion"]]],
 	["preprocessor", ["#", ["directive", "error"]]],
 	["preprocessor", ["#", ["directive", "line"]]],
+	["preprocessor", ["#", ["directive", "nullable"]]],
 	["preprocessor", ["#", ["directive", "pragma"]]],
 	["preprocessor", ["#", ["directive", "region"]]],
 	["preprocessor", ["#", ["directive", "undef"]]],