org.junit.rules
Class RuleChain

java.lang.Object
  org.junit.rules.RuleChain

All Implemented Interfaces:

TestRule

public class RuleChain
extends Object
implements TestRule

The RuleChain rule allows ordering of TestRules. You create a RuleChain with outerRule(TestRule) and subsequent calls of around(TestRule):

 public static class UseRuleChain {
        @Rule
        public TestRule chain= RuleChain
                               .outerRule(new LoggingRule("outer rule")
                               .around(new LoggingRule("middle rule")
                               .around(new LoggingRule("inner rule");
 
        @Test
        public void example() {
                assertTrue(true);
        }
 }
 

writes the log

 starting outer rule
 starting middle rule
 starting inner rule
 finished inner rule
 finished middle rule
 finished outer rule
 

Method Summary

Statement	apply(Statement base, Description description) Modifies the method-running Statement to implement this test-running rule.
RuleChain	around(TestRule enclosedRule) Create a new RuleChain, which encloses the nextRule with the rules of the current RuleChain.
static RuleChain	emptyRuleChain() Returns a RuleChain without a TestRule.
static RuleChain	outerRule(TestRule outerRule) Returns a RuleChain with a single TestRule.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

emptyRuleChain

public static RuleChain emptyRuleChain()

Returns a RuleChain without a TestRule. This method may be the starting point of a RuleChain.

Returns:

a RuleChain without a TestRule.

outerRule

public static RuleChain outerRule(TestRule outerRule)

Returns a RuleChain with a single TestRule. This method is the usual starting point of a RuleChain.

Parameters:

outerRule - the outer rule of the RuleChain.

Returns:

a RuleChain with a single TestRule.

around

public RuleChain around(TestRule enclosedRule)

Create a new RuleChain, which encloses the nextRule with the rules of the current RuleChain.

Parameters:

enclosedRule - the rule to enclose.

Returns:

a new RuleChain.

apply

public Statement apply(Statement base,
                       Description description)

Modifies the method-running Statement to implement this test-running rule.

Specified by:

apply in interface TestRule

Parameters:

base - The Statement to be modified

description - A Description of the test implemented in base

Returns:

a new statement, which may be the same as base, a wrapper around base, or a completely new Statement.