package org.junit;
import java.lang.reflect.Array;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.StringDescription;
import org.junit.internal.ArrayComparisonFailure;
/**
* A set of assertion methods useful for writing tests. Only failed assertions are recorded.
* These methods can be used directly: <code>Assert.assertEquals(...)</code>, however, they
* read better if they are referenced through static import:<br/>
* <pre>
* import static org.junit.Assert.*;
* ...
* assertEquals(...);
* </pre>
*
* @see AssertionError
*/
public class Assert {
/**
* Protect constructor since it is a static only class
*/
protected Assert() {
}
/**
* Asserts that a condition is true. If it isn't it throws an
* {@link AssertionError} with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param condition condition to be checked
*/
static public void assertTrue(String message, boolean condition) {
if (!condition)
fail(message);
}
/**
* Asserts that a condition is true. If it isn't it throws an
* {@link AssertionError} without a message.
* @param condition condition to be checked
*/
static public void assertTrue(boolean condition) {
assertTrue(null, condition);
}
/**
* Asserts that a condition is false. If it isn't it throws an
* {@link AssertionError} with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param condition condition to be checked
*/
static public void assertFalse(String message, boolean condition) {
assertTrue(message, !condition);
}
/**
* Asserts that a condition is false. If it isn't it throws an
* {@link AssertionError} without a message.
* @param condition condition to be checked
*/
static public void assertFalse(boolean condition) {
assertFalse(null, condition);
}
/**
* Fails a test with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @see AssertionError
*/
static public void fail(String message) {
throw new AssertionError(message == null ? "" : message);
}
/**
* Fails a test with no message.
*/
static public void fail() {
fail(null);
}
/**
* Asserts that two objects are equal. If they are not, an {@link AssertionError}
* is thrown with the given message. If <code>expected</code> and <code>actual</code>
* are <code>null</code>, they are considered equal.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expected expected value
* @param actual actual value
*/
static public void assertEquals(String message, Object expected, Object actual) {
if (expected == null && actual == null)
return;
if (expected != null && isEquals(expected, actual))
return;
else if (expected instanceof String && actual instanceof String) {
String cleanMessage= message == null ? "" : message;
throw new ComparisonFailure(cleanMessage, (String)expected, (String)actual);
}
else
failNotEquals(message, expected, actual);
}
private static boolean isEquals(Object expected, Object actual) {
return expected.equals(actual);
}
/**
* Asserts that two objects are equal. If they are not, an {@link AssertionError}
* without a message is thrown. If <code>expected</code> and <code>actual</code>
* are <code>null</code>, they are considered equal.
* @param expected expected value
* @param actual the value to check against <code>expected</code>
*/
static public void assertEquals(Object expected, Object actual) {
assertEquals(null, expected, actual);
}
/**
* Asserts that two object arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message. If <code>expecteds</code> and
* <code>actuals</code> are <code>null</code>, they are considered equal.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expecteds Object array or array of arrays (multi-dimensional array) with expected values.
* @param actuals Object array or array of arrays (multi-dimensional array) with actual values
*/
public static void assertArrayEquals(String message, Object[] expecteds,
Object[] actuals) throws ArrayComparisonFailure {
internalArrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two object arrays are equal. If they are not, an {@link AssertionError}
* is thrown. If <code>expected</code> and <code>actual</code> are <code>null</code>,
* they are considered equal.
* @param expecteds Object array or array of arrays (multi-dimensional array) with expected values
* @param actuals Object array or array of arrays (multi-dimensional array) with actual values
*/
public static void assertArrayEquals(Object[] expecteds, Object[] actuals) {
assertArrayEquals(null, expecteds, actuals);
}
/**
* Asserts that two byte arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expecteds byte array with expected values.
* @param actuals byte array with actual values
*/
public static void assertArrayEquals(String message, byte[] expecteds,
byte[] actuals) throws ArrayComparisonFailure {
internalArrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two byte arrays are equal. If they are not, an
* {@link AssertionError} is thrown.
* @param expecteds byte array with expected values.
* @param actuals byte array with actual values
*/
public static void assertArrayEquals(byte[] expecteds, byte[] actuals) {
assertArrayEquals(null, expecteds, actuals);
}
/**
* Asserts that two char arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expecteds char array with expected values.
* @param actuals char array with actual values
*/
public static void assertArrayEquals(String message, char[] expecteds,
char[] actuals) throws ArrayComparisonFailure {
internalArrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two char arrays are equal. If they are not, an
* {@link AssertionError} is thrown.
* @param expecteds char array with expected values.
* @param actuals char array with actual values
*/
public static void assertArrayEquals(char[] expecteds, char[] actuals) {
assertArrayEquals(null, expecteds, actuals);
}
/**
* Asserts that two short arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expecteds short array with expected values.
* @param actuals short array with actual values
*/
public static void assertArrayEquals(String message, short[] expecteds,
short[] actuals) throws ArrayComparisonFailure {
internalArrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two short arrays are equal. If they are not, an
* {@link AssertionError} is thrown.
* @param expecteds short array with expected values.
* @param actuals short array with actual values
*/
public static void assertArrayEquals(short[] expecteds, short[] actuals) {
assertArrayEquals(null, expecteds, actuals);
}
/**
* Asserts that two int arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expecteds int array with expected values.
* @param actuals int array with actual values
*/
public static void assertArrayEquals(String message, int[] expecteds,
int[] actuals) throws ArrayComparisonFailure {
internalArrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two int arrays are equal. If they are not, an
* {@link AssertionError} is thrown.
* @param expecteds int array with expected values.
* @param actuals int array with actual values
*/
public static void assertArrayEquals(int[] expecteds, int[] actuals) {
assertArrayEquals(null, expecteds, actuals);
}
/**
* Asserts that two long arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expecteds long array with expected values.
* @param actuals long array with actual values
*/
public static void assertArrayEquals(String message, long[] expecteds,
long[] actuals) throws ArrayComparisonFailure {
internalArrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two long arrays are equal. If they are not, an
* {@link AssertionError} is thrown.
* @param expecteds long array with expected values.
* @param actuals long array with actual values
*/
public static void assertArrayEquals(long[] expecteds, long[] actuals) {
assertArrayEquals(null, expecteds, actuals);
}
/**
* Asserts that two object arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message. If <code>expecteds</code> and
* <code>actuals</code> are <code>null</code>, they are considered equal.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expecteds Object array or array of arrays (multi-dimensional array) with expected values.
* @param actuals Object array or array of arrays (multi-dimensional array) with actual values
*/
private static void internalArrayEquals(String message, Object expecteds,
Object actuals) throws ArrayComparisonFailure {
if (expecteds == actuals)
return;
String header = message == null ? "" : message + ": ";
if (expecteds == null)
fail(header + "expected array was null");
if (actuals == null)
fail(header + "actual array was null");
int actualsLength= Array.getLength(actuals);
int expectedsLength= Array.getLength(expecteds);
if (actualsLength != expectedsLength)
fail(header + "array lengths differed, expected.length=" + expectedsLength + " actual.length=" + actualsLength);
for (int i= 0; i < expectedsLength; i++) {
Object expected= Array.get(expecteds, i);
Object actual= Array.get(actuals, i);
if (isArray(expected) && isArray(actual)) {
try {
internalArrayEquals(message, expected, actual);
} catch (ArrayComparisonFailure e) {
e.addDimension(i);
throw e;
}
} else
try {
assertEquals(expected, actual);
} catch (AssertionError e) {
throw new ArrayComparisonFailure(header, e, i);
}
}
}
private static boolean isArray(Object expected) {
return expected != null && expected.getClass().isArray();
}
/**
* Asserts that two doubles or floats are equal to within a positive delta. If they
* are not, an {@link AssertionError} is thrown with the given message. If the
* expected value is infinity then the delta value is ignored. NaNs are
* considered equal:
* <code>assertEquals(Double.NaN, Double.NaN, *)</code> passes
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expected expected value
* @param actual the value to check against <code>expected</code>
* @param delta the maximum delta between <code>expected</code> and <code>actual</code> for which
* both numbers are still considered equal.
*/
static public void assertEquals(String message, double expected, double actual, double delta) {
if (Double.compare(expected, actual) == 0)
return;
if (!(Math.abs(expected - actual) <= delta))
failNotEquals(message, new Double(expected), new Double(actual));
}
static public void assertEquals(long expected, long actual) {
assertEquals(null, expected, actual);
}
static public void assertEquals(String message, long expected, long actual) {
assertEquals(message, (Long)expected, (Long)actual);
}
static public void assertEquals(double expected, double actual) {
assertEquals(null, expected, actual);
}
static public void assertEquals(String message, double expected, double actual) {
fail("Use assertEquals(expected, actual, delta) to compare floating-point numbers");
}
/**
* Asserts that two doubles or floats are equal to within a positive delta. If they
* are not, an {@link AssertionError} is thrown. If the
* expected value is infinity then the delta value is ignored.NaNs are
* considered equal:
* <code>assertEquals(Double.NaN, Double.NaN, *)</code> passes
* @param expected expected value
* @param actual the value to check against <code>expected</code>
* @param delta the maximum delta between <code>expected</code> and <code>actual</code> for which
* both numbers are still considered equal.
*/
static public void assertEquals(double expected, double actual, double delta) {
assertEquals(null, expected, actual, delta);
}
/**
* Asserts that an object isn't null. If it is an {@link AssertionError} is
* thrown with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param object Object to check or <code>null</code>
*/
static public void assertNotNull(String message, Object object) {
assertTrue(message, object != null);
}
/**
* Asserts that an object isn't null. If it is an {@link AssertionError} is
* thrown.
* @param object Object to check or <code>null</code>
*/
static public void assertNotNull(Object object) {
assertNotNull(null, object);
}
/**
* Asserts that an object is null. If it is not, an {@link AssertionError} is
* thrown with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param object Object to check or <code>null</code>
*/
static public void assertNull(String message, Object object) {
assertTrue(message, object == null);
}
/**
* Asserts that an object is null. If it isn't an {@link AssertionError} is
* thrown.
* @param object Object to check or <code>null</code>
*/
static public void assertNull(Object object) {
assertNull(null, object);
}
/**
* Asserts that two objects refer to the same object. If they are not, an
* {@link AssertionError} is thrown with the given message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expected the expected object
* @param actual the object to compare to <code>expected</code>
*/
static public void assertSame(String message, Object expected, Object actual) {
if (expected == actual)
return;
failNotSame(message, expected, actual);
}
/**
* Asserts that two objects refer to the same object. If they are not the
* same, an {@link AssertionError} without a message is thrown.
* @param expected the expected object
* @param actual the object to compare to <code>expected</code>
*/
static public void assertSame(Object expected, Object actual) {
assertSame(null, expected, actual);
}
/**
* Asserts that two objects do not refer to the same object. If they do
* refer to the same object, an {@link AssertionError} is thrown with the given
* message.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param unexpected the object you don't expect
* @param actual the object to compare to <code>unexpected</code>
*/
static public void assertNotSame(String message, Object unexpected, Object actual) {
if (unexpected == actual)
failSame(message);
}
/**
* Asserts that two objects do not refer to the same object. If they do
* refer to the same object, an {@link AssertionError} without a message is thrown.
* @param unexpected the object you don't expect
* @param actual the object to compare to <code>unexpected</code>
*/
static public void assertNotSame(Object unexpected, Object actual) {
assertNotSame(null, unexpected, actual);
}
static private void failSame(String message) {
String formatted= "";
if (message != null)
formatted= message + " ";
fail(formatted + "expected not same");
}
static private void failNotSame(String message, Object expected, Object actual) {
String formatted= "";
if (message != null)
formatted= message + " ";
fail(formatted + "expected same:<" + expected + "> was not:<" + actual + ">");
}
static private void failNotEquals(String message, Object expected, Object actual) {
fail(format(message, expected, actual));
}
static String format(String message, Object expected, Object actual) {
String formatted= "";
if (message != null && ! message.equals(""))
formatted= message + " ";
String expectedString= String.valueOf(expected);
String actualString= String.valueOf(actual);
if (expectedString.equals(actualString))
return formatted + "expected: " + expected.getClass().getName() + "<" + expectedString + "> but was: " + actual.getClass().getName() + "<" + actualString + ">";
else
return formatted + "expected:<" + expectedString + "> but was:<" + actualString + ">";
}
/**
* Asserts that two object arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message. If <code>expecteds</code> and
* <code>actuals</code> are <code>null</code>, they are considered equal.
* @param message the identifying message or <code>null</code> for the {@link AssertionError}
* @param expecteds Object array or array of arrays (multi-dimensional array) with expected values.
* @param actuals Object array or array of arrays (multi-dimensional array) with actual values
* @deprecated use assertArrayEquals
*/
@Deprecated
public static void assertEquals(String message, Object[] expecteds, Object[] actuals) {
assertArrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two object arrays are equal. If they are not, an {@link AssertionError}
* is thrown. If <code>expected</code> and <code>actual</code> are <code>null</code>,
* they are considered equal.
* @param expecteds Object array or array of arrays (multi-dimensional array) with expected values
* @param actuals Object array or array of arrays (multi-dimensional array) with actual values
* @deprecated use assertArrayEquals
*/
@Deprecated
public static void assertEquals(Object[] expecteds, Object[] actuals) {
assertArrayEquals(expecteds, actuals);
}
public static <T> void assertThat(T actual, Matcher<T> matcher) {
assertThat("", actual, matcher);
}
public static <T> void assertThat(String reason, T actual, Matcher<T> matcher) {
if (!matcher.matches(actual)) {
Description description = new StringDescription();
description.appendText(reason);
description.appendText("\nExpected: ");
matcher.describeTo(description);
description.appendText("\n got: ").appendValue(actual).appendText("\n");
throw new java.lang.AssertionError(description.toString());
}
}
}
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