public class Null
extends java.lang.Object
null value.
The Null class is used when an
Expectation is set to expect nothing.
Example usage:
public class MockX {
private Expectation... anExpectation = new Expectation...(...);
public MockX() {
anExpectation.setExpectNothing();
}
public void setAnExpectation(Object value) {
anExpectation.setExpected(value);
}
public void setActual(Object value) {
anExpectation.setActual(value);
}
}
The act of calling Expectation.setExpectNothing()
tells the expectation that it should expect no values to change. Since
all Null objects are equal to themselves,
most expectations set their expected value to an instance of
Null, and at the same time, set their actual
value to another instance of Null.
This way, when org.jmock.expectation.Verifiable#verify() checks
expectations, they will compare two Null
objects together, which is guaranteed to succeed.| Modifier and Type | Field and Description |
|---|---|
static java.lang.String |
DEFAULT_DESCRIPTION
The default description for all
Null
objects. |
static Null |
NULL
A default
Null object. |
| Constructor and Description |
|---|
Null()
Instantiates a new
Null object with
the default description. |
Null(java.lang.String description)
Instantiates a new
Null object and
sets it's description. |
public static final java.lang.String DEFAULT_DESCRIPTION
Null
objects.
This String is equal to "Null".public static final Null NULL
public Null()
Null object with
the default description.DEFAULT_DESCRIPTIONpublic Null(java.lang.String description)
Null object and
sets it's description.description - public boolean equals(java.lang.Object other)
Null objects are only equal to
another instance of themselves.equals in class java.lang.Objectother - public int hashCode()
hashCode in class java.lang.Objectpublic java.lang.String toString()
Null
object.
This merely returns the string passed to the constructor initially.toString in class java.lang.Object