switchtest.groovy

来自「Groovy动态语言 运行在JVM中的动态语言 可以方便的处理业务逻辑变化大的业」· GROOVY 代码 · 共 106 行

class SwitchTest extends GroovyTestCase {

    void testSwitch() {
        callSwitch("foo", "foo")
        callSwitch("bar", "barfoo")
        callSwitch("barbar", "barfoo")
        callSwitch("dummy", "d*")
        callSwitch("xyz", "xyzDefault")
        callSwitch("zzz", "Default")
        callSwitch(4, "List")
        callSwitch(5, "List")
        callSwitch(6, "List")
        callSwitch("inList", "List")
        callSwitch(1, "Integer")
        callSwitch(1.2, "Number")
        callSwitch(null, "null")
    }

    def callSwitch(x, expected) {
        println("Calling switch with ${x}")

        def result = ""

        switch (x) {
        	case null:
        		result = "null"
                break

        	case ~/d.*/:
        		result = "d*"
                break

            case "barbar":
            case "bar":
                result = result + "bar"

            case "foo":
                result = result + "foo"
                break

            case [4, 5, 6, 'inList']:
                result = "List"
                break

            case Integer:
                result = "Integer"
                break

            case Number:
                result = "Number"
                break

            case "xyz":
                result = result + "xyz"

            default:
                result = result + "Default"

                // unnecessary just testing compiler
                break;
        }
        println("Found result ${result}")

        assert result == expected , "when calling switch with ${x}"
    }
    
    // test the continue in switch, which should jump to the the while start
    void testSwitchScope() {
        def i = 0
        def j = 0
        while (true) {
            ++i;
            switch(i) {
                case 4:
                    continue
                case 5:
                    break;
                default:
                    j += i;
                    break;
            }
            if (i == 5) break;
        }
        assert j == 6
    }

    void testSwitchWithClosure(){
        switch(0){
            case {true}: break
            default: assert false
        }
        switch(0){
            case {false}: assert false
        }
        switch(0){
            case {it == 0}: break
            default: assert false
        }
        switch(0){
            case { candidate -> candidate == 0}: break
            default: assert false
        }
    }
    
}