测试类的参数化

Question

在我的测试中，我有这个：

given:
def dueDateCol = App.instance.fxmlController.treeTableView.columns.get( 1 )

when:
def editorCell = dueDateCol.cellFactory.call( dueDateCol )

then:
editorCell instanceof TreeTableCell<TaskItem, LocalDate>

我的应用代码目前是这样的：

class DueDateEditor extends TreeTableCell {
}

...但是测试通过了！我希望它在应用代码正确参数化之前失败：

class DueDateEditor extends TreeTableCell<TaskItem, LocalDate>{
}

Answer 1

再一次，就像在my other answer 中一样，一般性的评论：你为什么要测试这样的东西？如果您对其进行测试，我宁愿确保以某种方式将静态类型检查集成到编译（或编译后）过程中。理想情况下，如果违反这样的合同，编译器应该抛出错误。

无论如何，无论如何，您都可以这样做（应用程序和测试类都是我在另一个答案中的MCVE 的逻辑延续）：

package de.scrum_master.stackoverflow.q61032514;

public class TaskItem {}

package de.scrum_master.stackoverflow.q61032514;

public class TreeTableCell<A, B> {}

package de.scrum_master.stackoverflow.q61032514;

import java.time.LocalDate;

public class DueDateEditor extends TreeTableCell<TaskItem, LocalDate> {
  String text;

  public boolean isEmpty() {
    return text == null || text.trim() == "";
  }

  public void startEdit() {
    if (!isEmpty())
      callSuperStartEdit();
  }

  public void callSuperStartEdit() {}
}

现在以下测试通过了：

package de.scrum_master.stackoverflow.q61032514

import spock.lang.Specification

import java.lang.reflect.ParameterizedType
import java.time.LocalDate

class DueDateEditorTest extends Specification {
  def "test generic type arguments for DueDateEditor"() {
    given:
    def superclass = DueDateEditor.superclass
    def genericSuperclass = DueDateEditor.genericSuperclass

    expect:
    superclass == TreeTableCell
    genericSuperclass instanceof ParameterizedType
    genericSuperclass.actualTypeArguments == [TaskItem, LocalDate]
    // Or, if you want to avoid the underlined 'actualTypeArguments' in your IDE:
    // (genericSuperclass as ParameterizedType).actualTypeArguments == [TaskItem, LocalDate]
  }
}

如果将被测类更改为DueDateEditor extends TreeTableCell，则测试失败如下：

Condition not satisfied:

genericSuperclass instanceof ParameterizedType
|                 |          |
|                 false      interface java.lang.reflect.ParameterizedType
class de.scrum_master.stackoverflow.q61032514.TreeTableCell (java.lang.Class)

如果你更改为DueDateEditor extends TreeTableCell<String, LocalDate> 之类的东西，它会像这样失败：

genericSuperclass.actualTypeArguments == [TaskItem, LocalDate]
|                 |                   |   |         |
|                 |                   |   |         class java.time.LocalDate
|                 |                   |   class de.scrum_master.stackoverflow.q61032514.TaskItem
|                 |                   false
|                 [<java.lang.Class@192d43ce cachedConstructor=null newInstanceCallerCache=null name=java.lang.String reflectionData=java.lang.ref.SoftReference@54709809 classRedefinedCount=0 genericInfo=sun.reflect.generics.repository.ClassRepository@2a2da905 enumConstants=null enumConstantDirectory=null annotationData=java.lang.Class$AnnotationData@24f360b2 annotationType=null classValueMap=[java.lang.ClassValue$Identity@39c0f4a:java.lang.ClassValue$Entry@60cf80e7]>, <java.lang.Class@38e79ae3 cachedConstructor=null newInstanceCallerCache=null name=java.time.LocalDate reflectionData=java.lang.ref.SoftReference@302fec27 classRedefinedCount=0 genericInfo=sun.reflect.generics.repository.ClassRepository@770d0ea6 enumConstants=null enumConstantDirectory=null annotationData=null annotationType=null classValueMap=[java.lang.ClassValue$Identity@39c0f4a:java.lang.ClassValue$Entry@48c40605]>]
de.scrum_master.stackoverflow.q61032514.TreeTableCell<java.lang.String, java.time.LocalDate>

或者，如果您想更好地比较错误消息中的列表，您可以像这样使用toList()：

    genericSuperclass.actualTypeArguments.toList() == [TaskItem, LocalDate]
    // Or, if you want to avoid the underlined 'actualTypeArguments' in your IDE:
    //(genericSuperclass as ParameterizedType).actualTypeArguments.toList() == [TaskItem, LocalDate]

那么最后一条错误信息会变成：

Condition not satisfied:

genericSuperclass.actualTypeArguments.toList() == [TaskItem, LocalDate]
|                 |                   |        |   |         |
|                 |                   |        |   |         class java.time.LocalDate
|                 |                   |        |   class de.scrum_master.stackoverflow.q61032514.TaskItem
|                 |                   |        false
|                 |                   [class java.lang.String, class java.time.LocalDate]
|                 [<java.lang.Class@192d43ce cachedConstructor=null newInstanceCallerCache=null name=java.lang.String reflectionData=java.lang.ref.SoftReference@60cf80e7 classRedefinedCount=0 genericInfo=sun.reflect.generics.repository.ClassRepository@302fec27 enumConstants=null enumConstantDirectory=null annotationData=java.lang.Class$AnnotationData@770d0ea6 annotationType=null classValueMap=[java.lang.ClassValue$Identity@39c0f4a:java.lang.ClassValue$Entry@48c40605]>, <java.lang.Class@2d2ffcb7 cachedConstructor=null newInstanceCallerCache=null name=java.time.LocalDate reflectionData=java.lang.ref.SoftReference@54107f42 classRedefinedCount=0 genericInfo=sun.reflect.generics.repository.ClassRepository@1b11ef33 enumConstants=null enumConstantDirectory=null annotationData=null annotationType=null classValueMap=[java.lang.ClassValue$Identity@39c0f4a:java.lang.ClassValue$Entry@476aac9]>]
de.scrum_master.stackoverflow.q61032514.TreeTableCell<java.lang.String, java.time.LocalDate>