Add test for microsoft#28334

Author: sheetalkamat

tests/baselines/reference/uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.js

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+//// [uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts]
+const FOO_SYMBOL = Symbol('Foo');
+
+declare global {
+    interface Promise<T> {
+        [FOO_SYMBOL]?: number;
+    }
+}
+
+export function foo<T>(p: Promise<T>) {
+    p[FOO_SYMBOL] = 3;
+}
+
+//// [uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.js]
+const FOO_SYMBOL = Symbol('Foo');
+export function foo(p) {
+    p[FOO_SYMBOL] = 3;
+}

tests/baselines/reference/uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.symbols

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+=== tests/cases/compiler/uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts ===
+const FOO_SYMBOL = Symbol('Foo');
+>FOO_SYMBOL : Symbol(FOO_SYMBOL, Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 0, 5))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+
+declare global {
+>global : Symbol(global, Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 0, 33))
+
+    interface Promise<T> {
+>Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 2, 16))
+>T : Symbol(T, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 3, 22))
+
+        [FOO_SYMBOL]?: number;
+>[FOO_SYMBOL] : Symbol(Promise[FOO_SYMBOL], Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 3, 26))
+>FOO_SYMBOL : Symbol(FOO_SYMBOL, Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 0, 5))
+    }
+}
+
+export function foo<T>(p: Promise<T>) {
+>foo : Symbol(foo, Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 6, 1))
+>T : Symbol(T, Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 8, 20))
+>p : Symbol(p, Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 8, 23))
+>Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 2, 16))
+>T : Symbol(T, Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 8, 20))
+
+    p[FOO_SYMBOL] = 3;
+>p : Symbol(p, Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 8, 23))
+>FOO_SYMBOL : Symbol(FOO_SYMBOL, Decl(uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts, 0, 5))
+}

tests/baselines/reference/uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.types

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+=== tests/cases/compiler/uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts ===
+const FOO_SYMBOL = Symbol('Foo');
+>FOO_SYMBOL : unique symbol
+>Symbol('Foo') : unique symbol
+>Symbol : SymbolConstructor
+>'Foo' : "Foo"
+
+declare global {
+>global : any
+
+    interface Promise<T> {
+        [FOO_SYMBOL]?: number;
+>[FOO_SYMBOL] : number | undefined
+>FOO_SYMBOL : unique symbol
+    }
+}
+
+export function foo<T>(p: Promise<T>) {
+>foo : <T>(p: Promise<T>) => void
+>p : Promise<T>
+
+    p[FOO_SYMBOL] = 3;
+>p[FOO_SYMBOL] = 3 : 3
+>p[FOO_SYMBOL] : number | undefined
+>p : Promise<T>
+>FOO_SYMBOL : unique symbol
+>3 : 3
+}

tests/cases/compiler/uniqueSymbolAssignmentOnGlobalAugmentationSuceeds.ts

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+// @strict: true
+// @target: es6
+const FOO_SYMBOL = Symbol('Foo');
+
+declare global {
+    interface Promise<T> {
+        [FOO_SYMBOL]?: number;
+    }
+}
+
+export function foo<T>(p: Promise<T>) {
+    p[FOO_SYMBOL] = 3;
+}