编写一个API

新增一个接口

public interface IFoo

{

    bool Ping(string ip);

}

接口实现

public class Foo : IFoo

{

    public bool Ping(string ip)

    {

        return new Random().Next(1, 100) % 2 == 1;

    }

}

编写一个待测试的API，其中有三个依赖项：SqliteDbContext，ILogger<SampleController>和IFoo

API实现的功能：先获取SqliteDbContext中的SampleEntity，如果其中的属性StringValue值为ping，并且结果为False，则返回404，否则返回SampleEntity

[Route("api/[controller]")]

[ApiController]

public class SampleController : ControllerBase

{

    private readonly SqliteDbContext _sqliteDbContext;

    private readonly ILogger<SampleController> _logger;

    private readonly IFoo _foo;

    public SampleController(SqliteDbContext sqliteDbContext, ILogger<SampleController> logger,IFoo foo)

    {

        _logger = logger;

        _foo = foo;

        _sqliteDbContext = sqliteDbContext;

    }

    [HttpGet("{id}")]

    public async Task<IActionResult> Get(int id)

    {

        var sampleData = await _sqliteDbContext.SampleEntity

            .SingleOrDefaultAsync(s => s.Id == id);

        if (sampleData?.StringValue == "ping")

        {

            var pingOk = _foo.Ping("localhost");

            if (!pingOk)

                return NotFound();

        }

        return Ok(sampleData);

    }

}

测试用例

Mock ILogger<SampleController>

var loggerMock = new Mock<ILogger<SampleController>>();

var logger = loggerMock.Object;

Mock Ping(string ip)

var fooMock = new Mock<IFoo>();

fooMock.Setup(foo => foo.Ping("localhost")).Returns(true);

var foo = fooMock.Object;

关于Moq的更多操作可参见：Moq4 Quickstart

修改GetSqliteDbContextAsync()，新增一个ID为2的数据记录

private async Task<SqliteDbContext> GetSqliteDbContextAsync()

{

    var options = new DbContextOptionsBuilder<SqliteDbContext>()

        .UseInMemoryDatabase(Guid.NewGuid().ToString())

        .Options;

    var sqliteDbContext = new SqliteDbContext(options);

    sqliteDbContext.SampleEntity.Add(new Infrastructure.Entities.SampleEntity

    {

        Id = 1,

        BoolValue = false,

        DateTimeValue = DateTime.Now,

        StringValue = "sample"

    });

    sqliteDbContext.SampleEntity.Add(new Infrastructure.Entities.SampleEntity

    {

        Id = 2,

        BoolValue = false,

        DateTimeValue = DateTime.Now,

        StringValue = "ping"

    });

    await sqliteDbContext.SaveChangesAsync();

    return sqliteDbContext;

}

测试Ping==True

[TestMethod]

public async Task Get_ReturnOK_WithPingTrue()

{

    // Arrange

    var dbContext = await GetSqliteDbContextAsync();

    var loggerMock = new Mock<ILogger<SampleController>>();

    var logger = loggerMock.Object;

    var fooMock = new Mock<IFoo>();

    fooMock.Setup(foo => foo.Ping("localhost")).Returns(true);

    var foo = fooMock.Object;

    var controller = new SampleController(dbContext, logger, foo);

    // Act

    var response = await controller.Get(2);

    var responseModel = ((OkObjectResult)response).Value as SampleEntity;

    // Assert

    Assert.IsInstanceOfType(response, typeof(OkObjectResult));

    Assert.IsTrue(responseModel.Id == 2);

    Assert.IsFalse(responseModel.BoolValue);

    Assert.IsTrue(responseModel.StringValue == "ping");

}

测试Ping==False

[TestMethod]

public async Task Get_ReturnOK_WithPingFalse()

{

    // Arrange

    var dbContext = await GetSqliteDbContextAsync();

    var loggerMock = new Mock<ILogger<SampleController>>();

    var logger = loggerMock.Object;

    var fooMock = new Mock<IFoo>();

    fooMock.Setup(foo => foo.Ping("localhost")).Returns(false);

    var foo = fooMock.Object;

    var controller = new SampleController(dbContext, logger, foo);

    // Act

    var response = await controller.Get(2);

    // Assert

    Assert.IsInstanceOfType(response, typeof(NotFoundResult));

}

测试结果

巴特西

.NET Core之单元测试（三）：Mock框架Moq的使用

编写一个API

测试用例

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