| package groovy |
| |
| /** |
| * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> |
| * @version $Revision$ |
| */ |
| class ClosureUsingOuterVariablesTest extends GroovyTestCase { |
| |
| void testUseOfOuterVariable() { |
| |
| def x = 123 |
| def y = "hello" |
| |
| def closure = { i -> |
| println("x ${x}") |
| println("y ${y}") |
| println("i ${i}") |
| |
| assert x == 123 |
| assert y == 'hello' |
| } |
| closure.call(321) |
| } |
| |
| /* |
| TODO: is this a valid test case? |
| void testInnerVariablesVisibleInOuterScope() { |
| |
| closure = { z = 456 } |
| closure.call(321) |
| |
| assert z == 456 |
| } |
| */ |
| |
| void testModifyingOuterVariable() { |
| |
| def m = 123 |
| |
| def closure = { m = 456 } |
| closure.call(321) |
| |
| assert m == 456 |
| } |
| |
| void testCounting() { |
| def sum = 0 |
| |
| [1, 2, 3, 4].each { sum = sum + it } |
| |
| assert sum == 10 |
| } |
| |
| void testExampleUseOfClosureScopes() { |
| def a = 123 |
| def b |
| def c = { b = a + it } |
| c(5) |
| |
| println(b) |
| assert b == a + 5 |
| } |
| |
| void testExampleUseOfClosureScopesUsingEach() { |
| def a = 123 |
| def b |
| [5].each { b = a + it } |
| |
| assert b == a + 5 |
| } |
| } |