1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/samples/instanceof/test/impl/InstanceProviderTest.java	Sat Jun 14 09:53:33 2008 +0200
     1.3 @@ -0,0 +1,99 @@
     1.4 +package impl;
     1.5 +
     1.6 +import api.BetterInstanceProvider;
     1.7 +import api.InstanceProvider;
     1.8 +import org.junit.After;
     1.9 +import org.junit.AfterClass;
    1.10 +import org.junit.Before;
    1.11 +import org.junit.BeforeClass;
    1.12 +import org.junit.Test;
    1.13 +import static org.junit.Assert.*;
    1.14 +
    1.15 +public class InstanceProviderTest {
    1.16 +
    1.17 +    public InstanceProviderTest() {
    1.18 +    }
    1.19 +
    1.20 +    @BeforeClass
    1.21 +    public static void setUpClass() throws Exception {
    1.22 +    }
    1.23 +
    1.24 +    @AfterClass
    1.25 +    public static void tearDownClass() throws Exception {
    1.26 +    }
    1.27 +
    1.28 +    @Before
    1.29 +    public void setUp() {
    1.30 +    }
    1.31 +
    1.32 +    @After
    1.33 +    public void tearDown() {
    1.34 +    }
    1.35 +
    1.36 +    @Test
    1.37 +    public void verifyBehaviourOnOldInterface() {
    1.38 +        class IP implements InstanceProvider {
    1.39 +            int instanceClass;
    1.40 +            int instanceCreate;
    1.41 +            
    1.42 +            public Class<?> instanceClass() {
    1.43 +                instanceClass++;
    1.44 +                return String.class;
    1.45 +            }
    1.46 +
    1.47 +            public Object instanceCreate() {
    1.48 +                instanceCreate++;
    1.49 +                return "API Design!";
    1.50 +            }
    1.51 +        }
    1.52 +        IP instance = new IP();
    1.53 +        
    1.54 +        boolean isString = checkIsString(instance);
    1.55 +        assertTrue("Provides string", isString);
    1.56 +        assertEquals("Class was tested", 1, instance.instanceClass);
    1.57 +        assertEquals("No instance created", 0, instance.instanceCreate);
    1.58 +    }
    1.59 +    
    1.60 +    @Test
    1.61 +    public void verifyBehaviourOnNewInterface() {
    1.62 +        class IP implements BetterInstanceProvider {
    1.63 +            int isInstanceOf;
    1.64 +            int instanceClass;
    1.65 +            int instanceCreate;
    1.66 +            
    1.67 +            public Class<?> instanceClass() {
    1.68 +                instanceClass++;
    1.69 +                return String.class;
    1.70 +            }
    1.71 +
    1.72 +            public Object instanceCreate() {
    1.73 +                instanceCreate++;
    1.74 +                return "API Design!";
    1.75 +            }
    1.76 +
    1.77 +            public boolean isInstanceOf(Class<?> c) {
    1.78 +                isInstanceOf++;
    1.79 +                return c.isAssignableFrom(String.class);
    1.80 +            }
    1.81 +        }
    1.82 +        IP instance = new IP();
    1.83 +        
    1.84 +        boolean isString = checkIsString(instance);
    1.85 +        assertTrue("Provides string", isString);
    1.86 +        assertEquals("Class was not tested", 0, instance.instanceClass);
    1.87 +        assertEquals("No instance created", 0, instance.instanceCreate);
    1.88 +        assertEquals("isInstanceOf called", 1, instance.isInstanceOf);
    1.89 +    }
    1.90 +
    1.91 +    private static boolean checkIsString(InstanceProvider instance) {
    1.92 +        // BEGIN: instanceof.Use
    1.93 +        if (instance instanceof BetterInstanceProvider) {
    1.94 +            BetterInstanceProvider bip = (BetterInstanceProvider)instance;
    1.95 +            return bip.isInstanceOf(String.class);
    1.96 +        } else {
    1.97 +            return String.class.isAssignableFrom(instance.instanceClass());
    1.98 +        }
    1.99 +        // END: instanceof.Use
   1.100 +    }
   1.101 +
   1.102 +}
   1.103 \ No newline at end of file