Add test from original issue

Author: Maria Solano

tests/cases/fourslash/completionsUnionStringLiteralProperty.ts

@@ -0,0 +1,9 @@
+/// <reference path="fourslash.ts" />
+
+//// type Foo = { a: 0, b: 'x' } | { a: 0, b: 'y' } | { a: 1, b: 'z' };
+//// const foo: Foo = { a: 0, b: '/*1*/' }
+////
+//// type Bar = { a: 0, b: 'fx' } | { a: 0, b: 'fy' } | { a: 1, b: 'fz' };
+//// const bar: Bar = { a: 0, b: 'f/*2*/' }
+verify.completions({ marker: "1", triggerCharacter: "'", includes: [ "x", "y" ], excludes: [ "z" ] });
+verify.completions({ marker: "2", triggerCharacter: "'", includes: [ "fx", "fy" ], excludes: [ "fz" ] });