[tests] add test

closes #7328

tests/display/src/cases/Issue7328.hx

@@ -0,0 +1,19 @@
+package cases;
+
+class Issue7328 extends DisplayTestCase {
+	/**
+		import haxe.macro.Expr.ExprDef;
+
+		class Main {
+			public static function main() {
+				switch (null:ExprDef) {
+					case EConst(CInt({-1-}v)):
+					case _:
+				}
+			}
+		}
+	**/
+	function test() {
+		sigEq(0, [["v:String"]], signature(pos(1)));
+	}
+}