doubleoperationtest.groovy

大名鼎鼎的java动态脚本语言。已经通过了sun的认证

class DoubleOperationTest extends GroovyTestCase {

    def x
    def y
    
    void testPlus() {
        x = 2.1 + 2.1
        assert x == 4.2
        
        x = 3 + 2.2
        assert x == 5.2
        
        x = 2.2 + 4
        assert x == 6.2
        
        y = x + 1
        assert y == 7.2       
        	
        def z = y + x + 1 + 2
        assert z == 16.4
    }
    
    void testMinus() {
        x = 6 - 2.2
        assert x == 3.8
        
        x = 5.8 - 2
        assert x == 3.8
        
        y = x - 1
		assert y == 2.8        
    }
    
    void testMultiply() {
        x = 3 * 2.0
        assert x == 6.0
        
        x = 3.0 * 2
        assert x == 6.0
        
        x = 3.0 * 2.0
        assert x == 6.0
        y = x * 2
        assert y == 12.0        
    }
    
    void testDivide() {
        x = 80.0 / 4
        assert x == 20.0 , "x = " + x
        
        x = 80 / 4.0
        assert x == 20.0 , "x = " + x
        
        y = x / 2
        assert y == 10.0 , "y = " + y     
    }

    void testMethodNotFound() {
    	try {
    		println( Math.sin("foo", 7) );
	    	fail("Should catch a MissingMethodException");
    	} catch (MissingMethodException mme) {
    	}
    }
        
    void testCoerce() {
    	def xyz = Math.sin(1.1);
    	assert xyz instanceof Double;
    	assert xyz == Math.sin(1.1D);
    	
        //Note that (7.3F).doubleValue() != 7.3D
    	x = Math.sin(7.3F);
    	assert x instanceof Double;
    	assert x == Math.sin((7.3F).doubleValue());

    	x = Math.sin(7);
    	assert x instanceof Double;
    	assert x == Math.sin(7.0D);
    }
}