feat: optimize test cases

Author: chenjigeng

tests/cases/fourslash/completionTypeAssertion.ts

@@ -1,5 +1,6 @@
 /// <reference path="fourslash.ts" />
 
-//// var x = this as/*1*/
+//// var x = 'something'
+//// var y = this as/*1*/
 
-verify.completions({marker: "1", exact: completion.globals })
+verify.completions({marker: "1", exact: completion.globalsPlus(["x"]) })

tests/cases/fourslash/tsxCompletionOnOpeningTagWithoutJSX1.ts

@@ -1,6 +1,7 @@
 /// <reference path='fourslash.ts' />
 
 //@Filename: file.tsx
-//// var x = </**/;
+//// var x = 'something'
+//// var y = </**/;
 
-verify.completions({ marker: "", exact: [completion.globalThisEntry, ...completion.globalsVars, completion.undefinedVarEntry] });
+verify.completions({ marker: "", exact: [completion.globalThisEntry, ...completion.globalsVars, "x", completion.undefinedVarEntry] });