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/**
* Originally from http://www.cornetdesign.com/files/BeanTestCase.java.txt
*/
package org.connectbot.mock;
import junit.framework.TestCase;
import java.lang.reflect.Field;
public class BeanTestCase extends TestCase {
private static final String TEST_STRING_VAL1 = "Some Value";
private static final String TEST_STRING_VAL2 = "Some Other Value";
public static void assertMeetsEqualsContract(Class<?> classUnderTest,
String[] fieldNames) {
Object o1;
Object o2;
try {
// Get Instances
o1 = classUnderTest.newInstance();
o2 = classUnderTest.newInstance();
assertTrue(
"Instances with default constructor not equal (o1.equals(o2))",
o1.equals(o2));
assertTrue(
"Instances with default constructor not equal (o2.equals(o1))",
o2.equals(o1));
Field[] fields = getFieldsByNameOrAll(classUnderTest, fieldNames);
for (int i = 0; i < fields.length; i++) {
// Reset the instances
o1 = classUnderTest.newInstance();
o2 = classUnderTest.newInstance();
Field field = fields[i];
field.setAccessible(true);
if (field.getType() == String.class) {
field.set(o1, TEST_STRING_VAL1);
} else if (field.getType() == boolean.class) {
field.setBoolean(o1, true);
} else if (field.getType() == short.class) {
field.setShort(o1, (short) 1);
} else if (field.getType() == long.class) {
field.setLong(o1, (long) 1);
} else if (field.getType() == float.class) {
field.setFloat(o1, (float) 1);
} else if (field.getType() == int.class) {
field.setInt(o1, 1);
} else if (field.getType() == byte.class) {
field.setByte(o1, (byte) 1);
} else if (field.getType() == char.class) {
field.setChar(o1, (char) 1);
} else if (field.getType() == double.class) {
field.setDouble(o1, (double) 1);
} else if (field.getType().isEnum()) {
field.set(o1, field.getType().getEnumConstants()[0]);
} else if (Object.class.isAssignableFrom(field.getType())) {
field.set(o1, field.getType().newInstance());
} else {
fail("Don't know how to set a " + field.getType().getName());
}
assertFalse("Instances with o1 having " + field.getName()
+ " set and o2 having it not set are equal", o1
.equals(o2));
field.set(o2, field.get(o1));
assertTrue(
"After setting o2 with the value of the object in o1, the two objects in the field are not equal",
field.get(o1).equals(field.get(o2)));
assertTrue(
"Instances with o1 having "
+ field.getName()
+ " set and o2 having it set to the same object of type "
+ field.get(o2).getClass().getName()
+ " are not equal", o1.equals(o2));
if (field.getType() == String.class) {
field.set(o2, TEST_STRING_VAL2);
} else if (field.getType() == boolean.class) {
field.setBoolean(o2, false);
} else if (field.getType() == short.class) {
field.setShort(o2, (short) 0);
} else if (field.getType() == long.class) {
field.setLong(o2, (long) 0);
} else if (field.getType() == float.class) {
field.setFloat(o2, (float) 0);
} else if (field.getType() == int.class) {
field.setInt(o2, 0);
} else if (field.getType() == byte.class) {
field.setByte(o2, (byte) 0);
} else if (field.getType() == char.class) {
field.setChar(o2, (char) 0);
} else if (field.getType() == double.class) {
field.setDouble(o2, (double) 1);
} else if (field.getType().isEnum()) {
field.set(o2, field.getType().getEnumConstants()[1]);
} else if (Object.class.isAssignableFrom(field.getType())) {
field.set(o2, field.getType().newInstance());
} else {
fail("Don't know how to set a " + field.getType().getName());
}
if (field.get(o1).equals(field.get(o2))) {
// Even though we have different instances, they are equal.
// Let's walk one of them
// to see if we can find a field to set
Field[] paramFields = field.get(o1).getClass()
.getDeclaredFields();
for (int j = 0; j < paramFields.length; j++) {
paramFields[j].setAccessible(true);
if (paramFields[j].getType() == String.class) {
paramFields[j].set(field.get(o1), TEST_STRING_VAL1);
}
}
}
assertFalse(
"After setting o2 with a different object than what is in o1, the two objects in the field are equal. "
+ "This is after an attempt to walk the fields to make them different",
field.get(o1).equals(field.get(o2)));
assertFalse(
"Instances with o1 having "
+ field.getName()
+ " set and o2 having it set to a different object are equal",
o1.equals(o2));
}
} catch (InstantiationException e) {
e.printStackTrace();
throw new AssertionError(
"Unable to construct an instance of the class under test");
} catch (IllegalAccessException e) {
e.printStackTrace();
throw new AssertionError(
"Unable to construct an instance of the class under test");
} catch (SecurityException e) {
e.printStackTrace();
throw new AssertionError(
"Unable to read the field from the class under test");
} catch (NoSuchFieldException e) {
e.printStackTrace();
throw new AssertionError(
"Unable to find field in the class under test");
}
}
/**
* @param classUnderTest
* @param fieldNames
* @return
* @throws NoSuchFieldException
*/
private static Field[] getFieldsByNameOrAll(Class<?> classUnderTest,
String[] fieldNames) throws NoSuchFieldException {
Field fields[];
if (fieldNames == null) {
fields = classUnderTest.getDeclaredFields();
} else {
fields = new Field[fieldNames.length];
for (int i = 0; i < fieldNames.length; i++)
fields[i] = classUnderTest.getDeclaredField(fieldNames[i]);
}
return fields;
}
public static void assertMeetsHashCodeContract(Class<?> classUnderTest,
String[] fieldNames) {
try {
Field[] fields = getFieldsByNameOrAll(classUnderTest, fieldNames);
for (int i = 0; i < fields.length; i++) {
Object o1 = classUnderTest.newInstance();
int initialHashCode = o1.hashCode();
Field field = fields[i];
field.setAccessible(true);
if (field.getType() == String.class) {
field.set(o1, TEST_STRING_VAL1);
} else if (field.getType() == boolean.class) {
field.setBoolean(o1, true);
} else if (field.getType() == short.class) {
field.setShort(o1, (short) 1);
} else if (field.getType() == long.class) {
field.setLong(o1, (long) 1);
} else if (field.getType() == float.class) {
field.setFloat(o1, (float) 1);
} else if (field.getType() == int.class) {
field.setInt(o1, 1);
} else if (field.getType() == byte.class) {
field.setByte(o1, (byte) 1);
} else if (field.getType() == char.class) {
field.setChar(o1, (char) 1);
} else if (field.getType() == double.class) {
field.setDouble(o1, (double) 1);
} else if (field.getType().isEnum()) {
field.set(o1, field.getType().getEnumConstants()[0]);
} else if (Object.class.isAssignableFrom(field.getType())) {
field.set(o1, field.getType().newInstance());
} else {
fail("Don't know how to set a " + field.getType().getName());
}
int updatedHashCode = o1.hashCode();
assertFalse(
"The field "
+ field.getName()
+ " was not taken into account for the hashCode contract ",
initialHashCode == updatedHashCode);
}
} catch (InstantiationException e) {
e.printStackTrace();
throw new AssertionError(
"Unable to construct an instance of the class under test");
} catch (IllegalAccessException e) {
e.printStackTrace();
throw new AssertionError(
"Unable to construct an instance of the class under test");
} catch (NoSuchFieldException e) {
e.printStackTrace();
throw new AssertionError(
"Unable to find field in the class under test");
}
}
}
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