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package org.junit;
import org.hamcrest.Matcher;
import org.hamcrest.MatcherAssert;
import org.junit.internal.ArrayComparisonFailure;
import org.junit.internal.ExactComparisonCriteria;
import org.junit.internal.InexactComparisonCriteria;
/**
* A set of assertion methods useful for writing tests. Only failed assertions
* are recorded. These methods can be used directly:
* Assert.assertEquals(...), however, they read better if they
* are referenced through static import:
*
*
*
* @see AssertionError
* @since 4.0
*/
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 for the {@link AssertionError} (null
* okay)
* @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 for the {@link AssertionError} (null
* okay)
* @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 for the {@link AssertionError} (null
* okay)
* @see AssertionError
*/
static public void fail(String message) {
if (message == null) {
throw new AssertionError();
}
throw new AssertionError(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
* expected and actual are null,
* they are considered equal.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param expected expected value
* @param actual actual value
*/
static public void assertEquals(String message, Object expected,
Object actual) {
if (equalsRegardingNull(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 equalsRegardingNull(Object expected, Object actual) {
if (expected == null) {
return actual == null;
}
return isEquals(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
* expected and actual are null,
* they are considered equal.
*
* @param expected expected value
* @param actual the value to check against expected
*/
static public void assertEquals(Object expected, Object actual) {
assertEquals(null, expected, actual);
}
/**
* Asserts that two objects are not equals. If they are, an
* {@link AssertionError} is thrown with the given message. If
* first and second are null,
* they are considered equal.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param first first value to check
* @param second the value to check against first
*/
static public void assertNotEquals(String message, Object first,
Object second) {
if (equalsRegardingNull(first, second)) {
failEquals(message, first);
}
}
/**
* Asserts that two objects are not equals. If they are, an
* {@link AssertionError} without a message is thrown. If
* first and second are null,
* they are considered equal.
*
* @param first first value to check
* @param second the value to check against first
*/
static public void assertNotEquals(Object first, Object second) {
assertNotEquals(null, first, second);
}
private static void failEquals(String message, Object actual) {
String formatted = "Values should be different. ";
if (message != null) {
formatted = message + ". ";
}
formatted += "Actual: " + actual;
fail(formatted);
}
/**
* Asserts that two longs are not equals. If they are, an
* {@link AssertionError} is thrown with the given message.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param first first value to check
* @param second the value to check against first
*/
static public void assertNotEquals(String message, long first, long second) {
assertNotEquals(message, (Long) first, (Long) second);
}
/**
* Asserts that two longs are not equals. If they are, an
* {@link AssertionError} without a message is thrown.
*
* @param first first value to check
* @param second the value to check against first
*/
static public void assertNotEquals(long first, long second) {
assertNotEquals(null, first, second);
}
/**
* Asserts that two doubles or floats are not equal to within a positive delta.
* If they are, 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:
* assertNotEquals(Double.NaN, Double.NaN, *) fails
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param first first value to check
* @param second the value to check against first
* @param delta the maximum delta between expected and
* actual for which both numbers are still
* considered equal.
*/
static public void assertNotEquals(String message, double first,
double second, double delta) {
if (!doubleIsDifferent(first, second, delta)) {
failEquals(message, new Double(first));
}
}
/**
* Asserts that two doubles or floats are not equal to within a positive delta.
* If they are, an {@link AssertionError} is thrown. If the expected
* value is infinity then the delta value is ignored.NaNs are considered
* equal: assertNotEquals(Double.NaN, Double.NaN, *) fails
*
* @param first first value to check
* @param second the value to check against first
* @param delta the maximum delta between expected and
* actual for which both numbers are still
* considered equal.
*/
static public void assertNotEquals(double first, double second, double delta) {
assertNotEquals(null, first, second, delta);
}
/**
* Asserts that two object arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message. If
* expecteds and actuals are null,
* they are considered equal.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @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 expected and
* actual are null, 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 for the {@link AssertionError} (null
* okay)
* @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 for the {@link AssertionError} (null
* okay)
* @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 for the {@link AssertionError} (null
* okay)
* @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 for the {@link AssertionError} (null
* okay)
* @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 for the {@link AssertionError} (null
* okay)
* @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 double arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param expecteds double array with expected values.
* @param actuals double array with actual values
*/
public static void assertArrayEquals(String message, double[] expecteds,
double[] actuals, double delta) throws ArrayComparisonFailure {
new InexactComparisonCriteria(delta).arrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two double arrays are equal. If they are not, an
* {@link AssertionError} is thrown.
*
* @param expecteds double array with expected values.
* @param actuals double array with actual values
*/
public static void assertArrayEquals(double[] expecteds, double[] actuals, double delta) {
assertArrayEquals(null, expecteds, actuals, delta);
}
/**
* Asserts that two float arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param expecteds float array with expected values.
* @param actuals float array with actual values
*/
public static void assertArrayEquals(String message, float[] expecteds,
float[] actuals, float delta) throws ArrayComparisonFailure {
new InexactComparisonCriteria(delta).arrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two float arrays are equal. If they are not, an
* {@link AssertionError} is thrown.
*
* @param expecteds float array with expected values.
* @param actuals float array with actual values
*/
public static void assertArrayEquals(float[] expecteds, float[] actuals, float delta) {
assertArrayEquals(null, expecteds, actuals, delta);
}
/**
* Asserts that two object arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message. If
* expecteds and actuals are null,
* they are considered equal.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @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 {
new ExactComparisonCriteria().arrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two doubles 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:
* assertEquals(Double.NaN, Double.NaN, *) passes
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param expected expected value
* @param actual the value to check against expected
* @param delta the maximum delta between expected and
* actual for which both numbers are still
* considered equal.
*/
static public void assertEquals(String message, double expected,
double actual, double delta) {
if (doubleIsDifferent(expected, actual, delta)) {
failNotEquals(message, new Double(expected), new Double(actual));
}
}
/**
* Asserts that two 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:
* assertEquals(Float.NaN, Float.NaN, *) passes
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param expected expected value
* @param actual the value to check against expected
* @param delta the maximum delta between expected and
* actual for which both numbers are still
* considered equal.
*/
static public void assertEquals(String message, float expected,
float actual, float delta) {
if (Float.compare(expected, actual) == 0) {
return;
}
if (!(Math.abs(expected - actual) <= delta)) {
failNotEquals(message, new Float(expected), new Float(actual));
}
}
static private boolean doubleIsDifferent(double d1, double d2, double delta) {
if (Double.compare(d1, d2) == 0) {
return false;
}
if ((Math.abs(d1 - d2) <= delta)) {
return false;
}
return true;
}
/**
* Asserts that two longs are equal. If they are not, an
* {@link AssertionError} is thrown.
*
* @param expected expected long value.
* @param actual actual long value
*/
static public void assertEquals(long expected, long actual) {
assertEquals(null, expected, actual);
}
/**
* Asserts that two longs are equal. If they are not, an
* {@link AssertionError} is thrown with the given message.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param expected long expected value.
* @param actual long actual value
*/
static public void assertEquals(String message, long expected, long actual) {
assertEquals(message, (Long) expected, (Long) actual);
}
/**
* @deprecated Use
* assertEquals(double expected, double actual, double delta)
* instead
*/
@Deprecated
static public void assertEquals(double expected, double actual) {
assertEquals(null, expected, actual);
}
/**
* @deprecated Use
* assertEquals(String message, double expected, double actual, double delta)
* instead
*/
@Deprecated
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 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: assertEquals(Double.NaN, Double.NaN, *) passes
*
* @param expected expected value
* @param actual the value to check against expected
* @param delta the maximum delta between expected and
* actual 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 two 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: assertEquals(Float.NaN, Float.NaN, *) passes
*
* @param expected expected value
* @param actual the value to check against expected
* @param delta the maximum delta between expected and
* actual for which both numbers are still
* considered equal.
*/
static public void assertEquals(float expected, float actual, float 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 for the {@link AssertionError} (null
* okay)
* @param object Object to check or null
*/
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 null
*/
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 for the {@link AssertionError} (null
* okay)
* @param object Object to check or null
*/
static public void assertNull(String message, Object object) {
if (object == null) {
return;
}
failNotNull(message, object);
}
/**
* Asserts that an object is null. If it isn't an {@link AssertionError} is
* thrown.
*
* @param object Object to check or null
*/
static public void assertNull(Object object) {
assertNull(null, object);
}
static private void failNotNull(String message, Object actual) {
String formatted = "";
if (message != null) {
formatted = message + " ";
}
fail(formatted + "expected null, but was:<" + actual + ">");
}
/**
* 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 for the {@link AssertionError} (null
* okay)
* @param expected the expected object
* @param actual the object to compare to expected
*/
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 expected
*/
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 for the {@link AssertionError} (null
* okay)
* @param unexpected the object you don't expect
* @param actual the object to compare to unexpected
*/
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 unexpected
*/
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: "
+ formatClassAndValue(expected, expectedString)
+ " but was: " + formatClassAndValue(actual, actualString);
} else {
return formatted + "expected:<" + expectedString + "> but was:<"
+ actualString + ">";
}
}
private static String formatClassAndValue(Object value, String valueString) {
String className = value == null ? "null" : value.getClass().getName();
return className + "<" + valueString + ">";
}
/**
* Asserts that two object arrays are equal. If they are not, an
* {@link AssertionError} is thrown with the given message. If
* expecteds and actuals are null,
* they are considered equal.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @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 expected and
* actual are null, 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);
}
/**
* Asserts that actual satisfies the condition specified by
* matcher. If not, an {@link AssertionError} is thrown with
* information about the matcher and failing value. Example:
*
*
*
* org.hamcrest.Matcher does not currently document the meaning
* of its type parameter T. This method assumes that a matcher
* typed as Matcher<T> can be meaningfully applied only
* to values that could be assigned to a variable of type T.
*
* @param the static type accepted by the matcher (this can flag obvious
* compile-time problems such as {@code assertThat(1, is("a"))}
* @param actual the computed value being compared
* @param matcher an expression, built of {@link Matcher}s, specifying allowed
* values
* @see org.hamcrest.CoreMatchers
* @see org.hamcrest.MatcherAssert
*/
public static void assertThat(T actual, Matcher matcher) {
assertThat("", actual, matcher);
}
/**
* Asserts that actual satisfies the condition specified by
* matcher. If not, an {@link AssertionError} is thrown with
* the reason and information about the matcher and failing value. Example:
*
*
*
* org.hamcrest.Matcher does not currently document the meaning
* of its type parameter T. This method assumes that a matcher
* typed as Matcher<T> can be meaningfully applied only
* to values that could be assigned to a variable of type T.
*
* @param reason additional information about the error
* @param the static type accepted by the matcher (this can flag obvious
* compile-time problems such as {@code assertThat(1, is("a"))}
* @param actual the computed value being compared
* @param matcher an expression, built of {@link Matcher}s, specifying allowed
* values
* @see org.hamcrest.CoreMatchers
* @see org.hamcrest.MatcherAssert
*/
public static void assertThat(String reason, T actual,
Matcher matcher) {
MatcherAssert.assertThat(reason, actual, matcher);
}
}
