Add string-literal completion test for jsdoc

Author: sandersn

tests/cases/fourslash/completionForStringLiteral4.ts

@@ -0,0 +1,22 @@
+/// <reference path='fourslash.ts'/>
+// @allowJs: true
+// @Filename: in.js
+/////** I am documentation
+//// * @param {'literal'} p1
+//// * @param {"literal"} p2
+//// * @param {'other1' | 'other2'} p3
+//// * @param {'literal' | number} p4
+//// */
+////function f(p1, p2, p3, p4) {
+////    return p1 + p2 + p3 + p4 + '.';
+////}
+////f/*1*/('literal', 'literal', "o/*2*/ther1", 12);
+
+goTo.marker('1');
+verify.quickInfoExists();
+verify.quickInfoIs('function f(p1: "literal", p2: "literal", p3: "other1" | "other2", p4: "literal" | number): string', 'I am documentation');
+
+goTo.marker('2');
+verify.completionListContains("other1");
+verify.completionListContains("other2");
+verify.memberListCount(2);