accounts/abi: add a test case for unpacking mobile interfaces

accounts/abi/unpack_test.go

@@ -287,6 +287,42 @@ func TestUnpack(t *testing.T) {
 	}
 }
 
+var unpackMobileTests = []unpackTest{
+	{
+		def:  `[{"type": "uint256"}]`,
+		enc:  "0000000000000000000000000000000000000000000000000000000000000001",
+		want: big.NewInt(1),
+	},
+}
+
+func TestUnpackMobileOnly(t *testing.T) {
+	for i, test := range unpackMobileTests {
+		t.Run(strconv.Itoa(i), func(t *testing.T) {
+			def := fmt.Sprintf(`[{ "name" : "method", "outputs": %s}]`, test.def)
+			abi, err := JSON(strings.NewReader(def))
+			if err != nil {
+				t.Fatalf("invalid ABI definition %s: %v", def, err)
+			}
+			encb, err := hex.DecodeString(test.enc)
+			if err != nil {
+				t.Fatalf("invalid hex: %s" + test.enc)
+			}
+			outptr := reflect.New(reflect.TypeOf(test.want))
+			results := make([]interface{}, 1)
+			copy(results, []interface{}{outptr.Interface()})
+			err = abi.Unpack(&results, "method", encb)
+			if err := test.checkError(err); err != nil {
+				t.Errorf("test %d (%v) failed: %v", i, test.def, err)
+				return
+			}
+			out := outptr.Elem().Interface()
+			if !reflect.DeepEqual(test.want, out) {
+				t.Errorf("test %d (%v) failed: expected %v, got %v", i, test.def, test.want, out)
+			}
+		})
+	}
+}
+
 type methodMultiOutput struct {
 	Int    *big.Int
 	String string