add 'find all references' test

Author: vladima

tests/cases/fourslash/findReferencesAfterEdit.ts

@@ -0,0 +1,22 @@
+/// <reference path='fourslash.ts'/>
+
+// @Filename: a.ts
+////interface A {
+////    foo: string;
+////}
+
+// @Filename: b.ts
+///////<reference path='a.ts'/>
+/////*0*/
+////function foo(x: A) {
+////    x.f/*1*/oo
+////}
+
+goTo.marker("1");
+verify.referencesCountIs(2);
+
+goTo.marker("0");
+edit.insert("\r\n");
+
+goTo.marker("1");
+verify.referencesCountIs(2);

tests/cases/fourslash/getOccurencesAfterEdit.ts

@@ -0,0 +1,18 @@
+/// <reference path='fourslash.ts'/>
+
+/////*0*/
+////interface A {
+////    foo: string;
+////}
+////function foo(x: A) {
+////    x.f/*1*/oo
+////}
+
+goTo.marker("1");
+verify.occurrencesAtPositionCount(2);
+
+goTo.marker("0");
+edit.insert("\r\n");
+
+goTo.marker("1");
+verify.occurrencesAtPositionCount(2);