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package org.junit;
import org.hamcrest.Matcher;
import org.hamcrest.MatcherAssert;
import org.junit.function.ThrowingRunnable;
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
*/
public static 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
*/
public static 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
*/
public static 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
*/
public static 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
*/
public static void fail(String message) {
if (message == null) {
throw new AssertionError();
}
throw new AssertionError(message);
}
/**
* Fails a test with no message.
*/
public static 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
*/
public static void assertEquals(String message, Object expected,
Object actual) {
if (equalsRegardingNull(expected, actual)) {
return;
}
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
*/
public static 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
* unexpected and actual are null,
* they are considered equal.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param unexpected unexpected value to check
* @param actual the value to check against unexpected
*/
public static void assertNotEquals(String message, Object unexpected,
Object actual) {
if (equalsRegardingNull(unexpected, actual)) {
failEquals(message, actual);
}
}
/**
* Asserts that two objects are not equals. If they are, an
* {@link AssertionError} without a message is thrown. If
* unexpected and actual are null,
* they are considered equal.
*
* @param unexpected unexpected value to check
* @param actual the value to check against unexpected
*/
public static void assertNotEquals(Object unexpected, Object actual) {
assertNotEquals(null, unexpected, actual);
}
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 unexpected unexpected value to check
* @param actual the value to check against unexpected
*/
public static void assertNotEquals(String message, long unexpected, long actual) {
if (unexpected == actual) {
failEquals(message, Long.valueOf(actual));
}
}
/**
* Asserts that two longs are not equals. If they are, an
* {@link AssertionError} without a message is thrown.
*
* @param unexpected unexpected value to check
* @param actual the value to check against unexpected
*/
public static void assertNotEquals(long unexpected, long actual) {
assertNotEquals(null, unexpected, actual);
}
/**
* Asserts that two doubles are not equal to within a positive delta.
* If they are, an {@link AssertionError} is thrown with the given
* message. If the unexpected 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 unexpected unexpected value
* @param actual the value to check against unexpected
* @param delta the maximum delta between unexpected and
* actual for which both numbers are still
* considered equal.
*/
public static void assertNotEquals(String message, double unexpected,
double actual, double delta) {
if (!doubleIsDifferent(unexpected, actual, delta)) {
failEquals(message, Double.valueOf(actual));
}
}
/**
* Asserts that two doubles are not equal to within a positive delta.
* If they are, an {@link AssertionError} is thrown. If the unexpected
* value is infinity then the delta value is ignored.NaNs are considered
* equal: assertNotEquals(Double.NaN, Double.NaN, *) fails
*
* @param unexpected unexpected value
* @param actual the value to check against unexpected
* @param delta the maximum delta between unexpected and
* actual for which both numbers are still
* considered equal.
*/
public static void assertNotEquals(double unexpected, double actual, double delta) {
assertNotEquals(null, unexpected, actual, delta);
}
/**
* Asserts that two floats are not equal to within a positive delta.
* If they are, an {@link AssertionError} is thrown. If the unexpected
* value is infinity then the delta value is ignored.NaNs are considered
* equal: assertNotEquals(Float.NaN, Float.NaN, *) fails
*
* @param unexpected unexpected value
* @param actual the value to check against unexpected
* @param delta the maximum delta between unexpected and
* actual for which both numbers are still
* considered equal.
*/
public static void assertNotEquals(float unexpected, float actual, float delta) {
assertNotEquals(null, unexpected, actual, 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 boolean 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 boolean array with expected values.
* @param actuals boolean array with expected values.
*/
public static void assertArrayEquals(String message, boolean[] expecteds,
boolean[] actuals) throws ArrayComparisonFailure {
internalArrayEquals(message, expecteds, actuals);
}
/**
* Asserts that two boolean arrays are equal. If they are not, an
* {@link AssertionError} is thrown. If expected and
* actual are null, they are considered
* equal.
*
* @param expecteds boolean array with expected values.
* @param actuals boolean array with expected values.
*/
public static void assertArrayEquals(boolean[] expecteds, boolean[] 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
* @param delta the maximum delta between expecteds[i] and
* actuals[i] for which both numbers are still
* considered equal.
*/
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
* @param delta the maximum delta between expecteds[i] and
* actuals[i] for which both numbers are still
* considered equal.
*/
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
* @param delta the maximum delta between expecteds[i] and
* actuals[i] for which both numbers are still
* considered equal.
*/
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
* @param delta the maximum delta between expecteds[i] and
* actuals[i] for which both numbers are still
* considered equal.
*/
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.
*/
public static void assertEquals(String message, double expected,
double actual, double delta) {
if (doubleIsDifferent(expected, actual, delta)) {
failNotEquals(message, Double.valueOf(expected), Double.valueOf(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.
*/
public static void assertEquals(String message, float expected,
float actual, float delta) {
if (floatIsDifferent(expected, actual, delta)) {
failNotEquals(message, Float.valueOf(expected), Float.valueOf(actual));
}
}
/**
* Asserts that two floats are not equal to within a positive delta.
* If they are, an {@link AssertionError} is thrown with the given
* message. If the unexpected value is infinity then the delta value is
* ignored. NaNs are considered equal:
* assertNotEquals(Float.NaN, Float.NaN, *) fails
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param unexpected unexpected value
* @param actual the value to check against unexpected
* @param delta the maximum delta between unexpected and
* actual for which both numbers are still
* considered equal.
*/
public static void assertNotEquals(String message, float unexpected,
float actual, float delta) {
if (!floatIsDifferent(unexpected, actual, delta)) {
failEquals(message, actual);
}
}
private static 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;
}
private static boolean floatIsDifferent(float f1, float f2, float delta) {
if (Float.compare(f1, f2) == 0) {
return false;
}
if ((Math.abs(f1 - f2) <= 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
*/
public static 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
*/
public static void assertEquals(String message, long expected, long actual) {
if (expected != actual) {
failNotEquals(message, Long.valueOf(expected), Long.valueOf(actual));
}
}
/**
* @deprecated Use
* assertEquals(double expected, double actual, double delta)
* instead
*/
@Deprecated
public static void assertEquals(double expected, double actual) {
assertEquals(null, expected, actual);
}
/**
* @deprecated Use
* assertEquals(String message, double expected, double actual, double delta)
* instead
*/
@Deprecated
public static 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.
*/
public static 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.
*/
public static 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
*/
public static 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
*/
public static 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
*/
public static 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
*/
public static void assertNull(Object object) {
assertNull(null, object);
}
private static 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
*/
public static 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
*/
public static 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
*/
public static 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
*/
public static void assertNotSame(Object unexpected, Object actual) {
assertNotSame(null, unexpected, actual);
}
private static void failSame(String message) {
String formatted = "";
if (message != null) {
formatted = message + " ";
}
fail(formatted + "expected not same");
}
private static void failNotSame(String message, Object expected,
Object actual) {
String formatted = "";
if (message != null) {
formatted = message + " ";
}
fail(formatted + "expected same:<" + expected + "> was not:<" + actual
+ ">");
}
private static 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 && !"".equals(message)) {
formatted = message + " ";
}
String expectedString = String.valueOf(expected);
String actualString = String.valueOf(actual);
if (equalsRegardingNull(expectedString, actualString)) {
return formatted + "expected: "
+ formatClassAndValue(expected, expectedString)
+ " but was: " + formatClassAndValue(actual, actualString);
} else {
return formatted + "expected:<" + expectedString + "> but was:<"
+ actualString + ">";
}
}
private static String formatClass(Class value) {
String className = value.getCanonicalName();
return className == null ? value.getName() : className;
}
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
* @deprecated use {@code org.hamcrest.junit.MatcherAssert.assertThat()}
*/
@Deprecated
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
* @deprecated use {@code org.hamcrest.junit.MatcherAssert.assertThat()}
*/
@Deprecated
public static void assertThat(String reason, T actual,
Matcher matcher) {
MatcherAssert.assertThat(reason, actual, matcher);
}
/**
* Asserts that {@code runnable} throws an exception of type {@code expectedThrowable} when
* executed. If it does, the exception object is returned. If it does not throw an exception, an
* {@link AssertionError} is thrown. If it throws the wrong type of exception, an {@code
* AssertionError} is thrown describing the mismatch; the exception that was actually thrown can
* be obtained by calling {@link AssertionError#getCause}.
*
* @param expectedThrowable the expected type of the exception
* @param runnable a function that is expected to throw an exception when executed
* @return the exception thrown by {@code runnable}
* @since 4.13
*/
public static T assertThrows(Class expectedThrowable,
ThrowingRunnable runnable) {
return assertThrows(null, expectedThrowable, runnable);
}
/**
* Asserts that {@code runnable} throws an exception of type {@code expectedThrowable} when
* executed. If it does, the exception object is returned. If it does not throw an exception, an
* {@link AssertionError} is thrown. If it throws the wrong type of exception, an {@code
* AssertionError} is thrown describing the mismatch; the exception that was actually thrown can
* be obtained by calling {@link AssertionError#getCause}.
*
* @param message the identifying message for the {@link AssertionError} (null
* okay)
* @param expectedThrowable the expected type of the exception
* @param runnable a function that is expected to throw an exception when executed
* @return the exception thrown by {@code runnable}
* @since 4.13
*/
public static T assertThrows(String message, Class expectedThrowable,
ThrowingRunnable runnable) {
try {
runnable.run();
} catch (Throwable actualThrown) {
if (expectedThrowable.isInstance(actualThrown)) {
@SuppressWarnings("unchecked") T retVal = (T) actualThrown;
return retVal;
} else {
String expected = formatClass(expectedThrowable);
Class actualThrowable = actualThrown.getClass();
String actual = formatClass(actualThrowable);
if (expected.equals(actual)) {
// There must be multiple class loaders. Add the identity hash code so the message
// doesn't say "expected: java.lang.String ..."
expected += "@" + Integer.toHexString(System.identityHashCode(expectedThrowable));
actual += "@" + Integer.toHexString(System.identityHashCode(actualThrowable));
}
String mismatchMessage = buildPrefix(message)
+ format("unexpected exception type thrown;", expected, actual);
// The AssertionError(String, Throwable) ctor is only available on JDK7.
AssertionError assertionError = new AssertionError(mismatchMessage);
assertionError.initCause(actualThrown);
throw assertionError;
}
}
String notThrownMessage = buildPrefix(message) + String
.format("expected %s to be thrown, but nothing was thrown",
formatClass(expectedThrowable));
throw new AssertionError(notThrownMessage);
}
private static String buildPrefix(String message) {
return message != null && message.length() != 0 ? message + ": " : "";
}
}
