Question

我正在编写Slick 3.1.1文档中的简单入门（http://slick.typesafe.com/doc/3.1.1/gettingstarted.html）示例。

我写了以下测试来断言咖啡的数量：

@Test def countCoffees() = {

    // Read all coffees and print them to the console
    val rf = db.run(coffees.result)
    // Equivalent SQL code:
    // select COF_NAME, SUP_ID, PRICE, SALES, TOTAL from COFFEES

    val r = Await.result(rf, Duration.Inf)

    assert(r.size == 5)
  }

有时候测试通过，有时候结果如下：

[info] - countCoffees *** FAILED ***
[info]   org.scalatest.junit.JUnitTestFailedError: Vector() had size 0 instead of expected size 5 (Test.scala:40)

TestSuite的定义如下：

class SlickScalaEjemplo extends FunSuite with SchemaEjemplo

SchemaEjemplo如下

trait SchemaEjemplo extends FunSuite with SlickBase with BeforeAndAfter {

  val setup = DBIO.seq(
    // Create the tables, including primary and foreign keys
    (suppliers.schema ++ coffees.schema).create,

    // Insert some suppliers
    suppliers += (101, "Acme, Inc.", "99 Market Street", "Groundsville", "CA", "95199"),
    suppliers += (49, "Superior Coffee", "1 Party Place", "Mendocino", "CA", "95460"),
    suppliers += (150, "The High Ground", "100 Coffee Lane", "Meadows", "CA", "93966"),
    // Equivalent SQL code:
    // insert into SUPPLIERS(SUP_ID, SUP_NAME, STREET, CITY, STATE, ZIP) values (?,?,?,?,?,?)

    // Insert some coffees (using JDBC's batch insert feature, if supported by the DB)
    coffees ++= Seq(
      ("Colombian", 101, 7.99, 0, 0),
      ("French_Roast", 49, 8.99, 0, 0),
      ("Espresso", 150, 9.99, 0, 0),
      ("Colombian_Decaf", 101, 8.99, 0, 0),
      ("French_Roast_Decaf", 49, 9.99, 0, 0)
    )
  // Equivalent SQL code:
  // insert into COFFEES(COF_NAME, SUP_ID, PRICE, SALES, TOTAL) values (?,?,?,?,?)
  )

  val setupFuture = db.run(setup)

  after {
    db.close()
  }

}

为什么此次测试的等待无法正常工作？

Answer 1

问题在于我没有等待以下

val setupFuture = db.run(setup)

执行所以测试正在运行，而不期望创建或完成架构。

我按如下方式更改了测试：

  test("countCoffees") {

    setupFuture.map(x => {
      // Read all coffees and print them to the console
      val rf = db.run(coffees.result)
      // Equivalent SQL code:
      // select COF_NAME, SUP_ID, PRICE, SALES, TOTAL from COFFEES

      val r = Await.result(rf, Duration.Inf)

      assert(r.size == 5)
    })

  }

因此，在完整模式上执行不同Action和db.run的执行，现在测试都是绿色的。

为什么这个Slick测试不一致失败？

1 个答案: