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25 
26 /* @test
27  * @run testng/othervm -ea -esa test.java.lang.invoke.ArrayLengthTest
28  */
29 package test.java.lang.invoke;
30 
31 import java.lang.invoke.MethodHandle;
32 import java.lang.invoke.MethodHandles;
33 
34 import static org.testng.AssertJUnit.*;
35 
36 import org.testng.annotations.*;
37 
38 public class ArrayLengthTest {
39 
40     @DataProvider
arrayClasses()41     Object[][] arrayClasses() {
42         return new Object[][] {
43                 {int[].class},
44                 {long[].class},
45                 {float[].class},
46                 {double[].class},
47                 {boolean[].class},
48                 {byte[].class},
49                 {short[].class},
50                 {char[].class},
51                 {Object[].class},
52                 {StringBuffer[].class}
53         };
54     }
55 
56     @Test(dataProvider = "arrayClasses")
testArrayLength(Class<?> arrayClass)57     public void testArrayLength(Class<?> arrayClass) throws Throwable {
58         MethodHandle arrayLength = MethodHandles.arrayLength(arrayClass);
59         assertEquals(int.class, arrayLength.type().returnType());
60         assertEquals(arrayClass, arrayLength.type().parameterType(0));
61         Object array = MethodHandles.arrayConstructor(arrayClass).invoke(10);
62         assertEquals(10, arrayLength.invoke(array));
63     }
64 
65     @Test(dataProvider = "arrayClasses", expectedExceptions = NullPointerException.class)
testArrayLengthInvokeNPE(Class<?> arrayClass)66     public void testArrayLengthInvokeNPE(Class<?> arrayClass) throws Throwable {
67         MethodHandle arrayLength = MethodHandles.arrayLength(arrayClass);
68         arrayLength.invoke(null);
69     }
70 
71     @Test(expectedExceptions = IllegalArgumentException.class)
testArrayLengthNoArray()72     public void testArrayLengthNoArray() {
73         MethodHandles.arrayLength(String.class);
74     }
75 
76     @Test(expectedExceptions = NullPointerException.class)
testArrayLengthNPE()77     public void testArrayLengthNPE() {
78         MethodHandles.arrayLength(null);
79     }
80 
81     @Test(expectedExceptions = NullPointerException.class)
testNullReference()82     public void testNullReference() throws Throwable {
83         MethodHandle arrayLength = MethodHandles.arrayLength(String[].class);
84         int len = (int)arrayLength.invokeExact((String[])null);
85     }
86 }
87