[textdecoder]添加textdecoder测试用例

uni_modules/uts-tests/utssdk/TextDecoder.uts

+import { describe, test, expect, Result } from './tests.uts'
+
+export function testDecoder() : Result {
+  return describe("TextDecoder", () => {
+    test('decoder', () => {
+      // #TEST TextDecoder.decode
+      var utf8decoder = new TextDecoder(); // default 'utf-8' or 'utf8'
+
+      var u8arr = Uint8Array.of(240, 160, 174, 183);
+      var i8arr = Int8Array.of(-16, -96, -82, -73);
+
+      expect(utf8decoder.decode(u8arr)).toEqual('𠮷')
+      expect(utf8decoder.decode(i8arr)).toEqual('𠮷')
+
+      utf8decoder = new TextDecoder("gbk"); // default 'utf-8' or 'utf8'
+      expect(utf8decoder.decode(u8arr)).toEqual('馉');
+      expect(utf8decoder.decode(i8arr)).toEqual('馉')
+
+      utf8decoder = new TextDecoder("utf-8");
+      var arraybuffer = new ArrayBuffer(4)
+      var dataView = new DataView(arraybuffer)
+      dataView.setInt8(0, -16)
+      dataView.setInt8(1, -96)
+      dataView.setInt8(2, -82)
+      dataView.setInt8(3, -73)
+      expect(utf8decoder.decode(dataView)).toEqual('𠮷');
+
+      // #END
+    })
+  })
+}
\ No newline at end of file

uni_modules/uts-tests/utssdk/index.uts

@@ -21,6 +21,7 @@ import { testArrayBuffer } from './ArrayBuffer.uts'
 import { testNativeCode } from './NativeCode.uts'
 import { testPromise} from "./Promise.uts"
 import { testEncoder} from "./TextEncoder.uts"
+import { testDecoder} from "./TextDecoder.uts"
 // Proxy、Reflect、Weakmap、WeakSet 不支持
 export function runTests() : UTSJSONObject {
   const ArrayRes = testArray();
@@ -49,6 +50,7 @@ export function runTests() : UTSJSONObject {
   const PromiseRes = testPromise();
   // #ifdef  APP-ANDROID || WEB
   const TextEncoderRes = testEncoder();
+  const TextDecoderRes = testDecoder();
   // #endif
   return {
     Array: ArrayRes,
@@ -72,6 +74,7 @@ export function runTests() : UTSJSONObject {
     // #ifdef  APP-ANDROID || WEB
     ArrayBuffer: ArrayBufferRes,
     TextEncoder: TextEncoderRes,
+    TextDecoder: TextDecoderRes,
     // #endif
     NativeCode: NativeCodeRes,
     Primise: PromiseRes