NSubstitute完全手册（十六）设置out和ref参数

1     public interface ILookup
2     {
3       bool TryLookup(string key, out string value);
4     }

 1     [TestMethod]
 2     public void Test_SetOutRefArgs_SetOutArg()
 3     {
 4       // Arrange
 5       var value = "";
 6       var lookup = Substitute.For<ILookup>();
 7       lookup
 8         .TryLookup("hello", out value)
 9         .Returns(x =>
10         {
11           x[1] = "world!";
12           return true;
13         });
14 
15       // Act
16       var result = lookup.TryLookup("hello", out value);
17 
18       // Assert
19       Assert.IsTrue(result);
20       Assert.AreEqual(value, "world!");
21     }