org.apache.commons.collections

Class AbstractTestObject

public abstract class AbstractTestObject extends BulkTest

Abstract test class for {@link java.lang.Object} methods and contracts.

To use, simply extend this class, and implement the {@link #makeObject()} method.

If your {@link Object} fails one of these tests by design, you may still use this base set of cases. Simply override the test case (method) your {@link Object} fails.

Field Summary
static int	COLLECTIONS_MAJOR_VERSION Current major release for Collections

Constructor Summary
	AbstractTestObject(String testName) JUnit constructor.

Method Summary
protected String	getCanonicalEmptyCollectionName(Object object)
protected String	getCanonicalFullCollectionName(Object object)
String	getCompatibilityVersion() Get the version of Collections that this object tries to maintain serialization compatibility with.
boolean	isEqualsCheckable() Returns true to indicate that the collection supports equals() comparisons.
boolean	isTestSerialization() Is serialization testing supported.
abstract Object	makeObject() Implement this method to return the object to test.
protected Object	readExternalFormFromBytes(byte[] b) Read a Serialized or Externalized Object from bytes.
protected Object	readExternalFormFromDisk(String path) Reads a Serialized or Externalized Object from disk.
protected boolean	skipSerializedCanonicalTests()
boolean	supportsEmptyCollections() Override this method if a subclass is testing an object that cannot serialize an "empty" Collection. (e.g.
boolean	supportsFullCollections() Override this method if a subclass is testing an object that cannot serialize a "full" Collection. (e.g.
void	testCanonicalEmptyCollectionExists() Tests serialization by comparing against a previously stored version in CVS.
void	testCanonicalFullCollectionExists() Tests serialization by comparing against a previously stored version in CVS.
void	testEqualsNull()
void	testObjectEqualsSelf()
void	testObjectHashCodeEqualsContract()
void	testObjectHashCodeEqualsSelfHashCode()
void	testSerializeDeserializeThenCompare()
void	testSimpleSerialization() Sanity check method, makes sure that any Serializable class can be serialized and de-serialized in memory, using the handy makeObject() method
protected byte[]	writeExternalFormToBytes(Serializable o) Converts a Serializable or Externalizable object to bytes.
protected void	writeExternalFormToDisk(Serializable o, String path) Write a Serializable or Externalizable object as a file at the given path.

Field Detail

COLLECTIONS_MAJOR_VERSION

public static final int COLLECTIONS_MAJOR_VERSION

Current major release for Collections

Constructor Detail

AbstractTestObject

public AbstractTestObject(String testName)

JUnit constructor.

Parameters: testName the test class name

Method Detail

getCanonicalEmptyCollectionName

protected String getCanonicalEmptyCollectionName(Object object)

getCanonicalFullCollectionName

protected String getCanonicalFullCollectionName(Object object)

Get the version of Collections that this object tries to maintain serialization compatibility with. Defaults to 1, the earliest Collections version. (Note: some collections did not even exist in this version). This constant makes it possible for TestMap (and other subclasses, if necessary) to automatically check CVS for a versionX copy of a Serialized object, so we can make sure that compatibility is maintained. See, for example, TestMap.getCanonicalFullMapName(Map map). Subclasses can override this variable, indicating compatibility with earlier Collections versions.

Returns: The version, or null if this object shouldn't be tested for compatibility with previous versions.

isEqualsCheckable

public boolean isEqualsCheckable()

Returns true to indicate that the collection supports equals() comparisons. This implementation returns true;

isTestSerialization

public boolean isTestSerialization()

Is serialization testing supported. Default is true.

makeObject

public abstract Object makeObject()

Implement this method to return the object to test.

Returns: the object to test

readExternalFormFromBytes

protected Object readExternalFormFromBytes(byte[] b)

Read a Serialized or Externalized Object from bytes. Useful for verifying serialization in memory.

Parameters: b byte array containing a serialized Object

Returns: Object contained in the bytes

Throws: IOException ClassNotFoundException

readExternalFormFromDisk

protected Object readExternalFormFromDisk(String path)

Reads a Serialized or Externalized Object from disk. Useful for creating compatibility tests between different CVS versions of the same class

Parameters: path path to the serialized Object

Returns: the Object at the given path

Throws: IOException ClassNotFoundException

skipSerializedCanonicalTests

protected boolean skipSerializedCanonicalTests()

supportsEmptyCollections

public boolean supportsEmptyCollections()

Override this method if a subclass is testing an object that cannot serialize an "empty" Collection. (e.g. Comparators have no contents)

Returns: true

supportsFullCollections

public boolean supportsFullCollections()

Override this method if a subclass is testing an object that cannot serialize a "full" Collection. (e.g. Comparators have no contents)

Returns: true

testCanonicalEmptyCollectionExists

public void testCanonicalEmptyCollectionExists()

Tests serialization by comparing against a previously stored version in CVS. If the test object is serializable, confirm that a canonical form exists.

testCanonicalFullCollectionExists

public void testCanonicalFullCollectionExists()

Tests serialization by comparing against a previously stored version in CVS. If the test object is serializable, confirm that a canonical form exists.

testEqualsNull

public void testEqualsNull()

testObjectEqualsSelf

public void testObjectEqualsSelf()

testObjectHashCodeEqualsContract

public void testObjectHashCodeEqualsContract()

testObjectHashCodeEqualsSelfHashCode

public void testObjectHashCodeEqualsSelfHashCode()

testSerializeDeserializeThenCompare

public void testSerializeDeserializeThenCompare()

testSimpleSerialization

public void testSimpleSerialization()

Sanity check method, makes sure that any Serializable class can be serialized and de-serialized in memory, using the handy makeObject() method

Throws: IOException ClassNotFoundException

writeExternalFormToBytes

protected byte[] writeExternalFormToBytes(Serializable o)

Converts a Serializable or Externalizable object to bytes. Useful for in-memory tests of serialization

Parameters: o Object to convert to bytes

Returns: serialized form of the Object

Throws: IOException

writeExternalFormToDisk

protected void writeExternalFormToDisk(Serializable o, String path)

Write a Serializable or Externalizable object as a file at the given path. NOT USEFUL as part of a unit test; this is just a utility method for creating disk-based objects in CVS that can become the basis for compatibility tests using readExternalFormFromDisk(String path)

Parameters: o Object to serialize path path to write the serialized Object

Throws: IOException