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Java junit assert exception

Содержание
  1. Ожидаемое исключение JUnit 5
  2. 1. Assertions API assertThrows ()
  3. 1.1. Синтаксис
  4. 1.2. Вывод теста
  5. 2. Ожидаемое исключение генерируемое в тесте
  6. 3. Сгенерировано исключение другого типа, или не сгенерировано исключение
  7. Java junit assert exception
  8. Assert
  9. assertTrue
  10. assertTrue
  11. assertFalse
  12. assertFalse
  13. assertEquals
  14. assertEquals
  15. assertNotEquals
  16. assertNotEquals
  17. assertNotEquals
  18. assertNotEquals
  19. assertNotEquals
  20. assertNotEquals
  21. assertNotEquals
  22. assertArrayEquals
  23. assertArrayEquals
  24. assertArrayEquals
  25. assertArrayEquals
  26. assertArrayEquals
  27. assertArrayEquals
  28. assertArrayEquals
  29. assertArrayEquals
  30. assertArrayEquals
  31. assertArrayEquals
  32. assertArrayEquals
  33. assertArrayEquals
  34. assertArrayEquals
  35. assertArrayEquals
  36. assertArrayEquals
  37. assertArrayEquals
  38. assertArrayEquals
  39. assertArrayEquals
  40. assertEquals
  41. assertEquals
  42. assertNotEquals
  43. assertEquals
  44. assertEquals
  45. assertEquals
  46. assertEquals
  47. assertEquals
  48. assertEquals
  49. assertNotNull
  50. assertNotNull
  51. assertNull
  52. assertNull
  53. assertSame
  54. assertSame
  55. assertNotSame
  56. assertNotSame
  57. assertEquals
  58. assertEquals
  59. assertThat
  60. assertThat
  61. assertThrows

Ожидаемое исключение JUnit 5

Это продолжение туториала по JUnit 5. Введение опубликовано здесь.

В JUnit 5, чтобы написать тестовый код, который, как ожидается, вызовет исключение, мы должны использовать Assertions.assertThrows().

В данном примере ожидается, что тестовый код в комментированном блоке вызовет исключение типа ApplicationException .

Использование Assertions.assertThrows()

Оглавление

Assertions API assertThrows ().

Ожидаемое исключение генерируется в тесте.

Сгенерировано исключение другого типа, или не сгенерировано исключение

1. Assertions API assertThrows ()

1.1. Синтаксис

Метод assertThrows() утверждает, что выполнение прилагаемого исполняемого блока или лямбда — выражения вызывает исключение типа expectedType . Это перегруженный метод, который принимает следующие параметры.

expectedType — ожидается, что тестовый код вызовет исключение этого типа.

message — если исполняемый код не вызывает никаких исключений, это сообщение будет напечатано вместе с результатом FAIL.

messageSupplier — сообщение будет извлечено из него в случае неудачи теста.

1.2. Вывод теста

Если в блоке не было генерировано исключение, executable , то assertThrows() вернет FAIL .

Если выбрасывается исключение другого типа, assertThrows() будет FAIL .

Если блок кода вызывает исключение класса, который является подтипом исключения expectedType , только тогда assertThrows() вернет PASS .

Например, если мы ожидаем, IllegalArgumentException и тест выдает ошибку NumberFormatException, тогда и вывод теста будет PASS потому что NumberFormatException расширяет класс IllegalArgumentException.

Кроме того, если мы передадим Exception.class в качестве ожидаемого типа исключения, любое исключение, выброшенное из исполняемого блока, сделает результат assertion равным PASS , поскольку Exception является супертипом для всех исключений.

2. Ожидаемое исключение генерируемое в тесте

Ниже приведен очень простой тест, который ожидает, что исключение NumberFormatException будет сгенерировано при выполнении предоставленного блока кода.

Оба теста выдают PASS

В тесте testExpectedException , исполняемый код Integer.parseInt(«One») генерирует исключение NumberFormatException, если аргумент метода не является допустимым текстовым представлением числа. Метод assertThrows() ожидает это исключение, так что результат теста PASS .

В тесте testExpectedExceptionWithParentType , мы выполняем тот же код, но на этот раз мы принимаем исключение IllegalArgumentException , родительское для NumberFormatException . Этот тест тоже проходит.

3. Сгенерировано исключение другого типа, или не сгенерировано исключение

Если исполняемый код вызывает исключение любого другого типа, то результат теста будет FAIL .

И даже если исполняемый код не вызывает никаких исключений, результат теста тоже будет FAIL .

Например, в приведенном ниже примере «1» это допустимое число, поэтому исключение не возникает. Этот тест завершится ошибкой с сообщением в консоли.

В этом посте мы узнали, как написать тест, ожидающий возникновение исключений. Эти тесты полезны при тестировании кода, написанного в блоках catch.

Источник

Java junit assert exception

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:

Constructor Summary
protected Assert ()
Protect constructor since it is a static only class
Method Summary
static void assertArrayEquals (boolean[] expecteds, boolean[] actuals)
Asserts that two boolean arrays are equal.
static void assertArrayEquals (byte[] expecteds, byte[] actuals)
Asserts that two byte arrays are equal.
static void assertArrayEquals (char[] expecteds, char[] actuals)
Asserts that two char arrays are equal.
static void assertArrayEquals (double[] expecteds, double[] actuals, double delta)
Asserts that two double arrays are equal.
static void assertArrayEquals (float[] expecteds, float[] actuals, float delta)
Asserts that two float arrays are equal.
static void assertArrayEquals (int[] expecteds, int[] actuals)
Asserts that two int arrays are equal.
static void assertArrayEquals (long[] expecteds, long[] actuals)
Asserts that two long arrays are equal.
static void assertArrayEquals (Object[] expecteds, Object[] actuals)
Asserts that two object arrays are equal.
static void assertArrayEquals (short[] expecteds, short[] actuals)
Asserts that two short arrays are equal.
static void assertArrayEquals (String message, boolean[] expecteds, boolean[] actuals)
Asserts that two boolean arrays are equal.
static void assertArrayEquals (String message, byte[] expecteds, byte[] actuals)
Asserts that two byte arrays are equal.
static void assertArrayEquals (String message, char[] expecteds, char[] actuals)
Asserts that two char arrays are equal.
static void assertArrayEquals (String message, double[] expecteds, double[] actuals, double delta)
Asserts that two double arrays are equal.
static void assertArrayEquals (String message, float[] expecteds, float[] actuals, float delta)
Asserts that two float arrays are equal.
static void assertArrayEquals (String message, int[] expecteds, int[] actuals)
Asserts that two int arrays are equal.
static void assertArrayEquals (String message, long[] expecteds, long[] actuals)
Asserts that two long arrays are equal.
static void assertArrayEquals (String message, Object[] expecteds, Object[] actuals)
Asserts that two object arrays are equal.
static void assertArrayEquals (String message, short[] expecteds, short[] actuals)
Asserts that two short arrays are equal.
static void assertEquals (double expected, double actual)
Deprecated. Use assertEquals(double expected, double actual, double delta) instead
static void assertEquals (double expected, double actual, double delta)
Asserts that two doubles are equal to within a positive delta.
static void assertEquals (float expected, float actual, float delta)
Asserts that two floats are equal to within a positive delta.
static void assertEquals (long expected, long actual)
Asserts that two longs are equal.
static void assertEquals (Object[] expecteds, Object[] actuals)
Deprecated. use assertArrayEquals
static void assertEquals (Object expected, Object actual)
Asserts that two objects are equal.
static void assertEquals (String message, double expected, double actual)
Deprecated. Use assertEquals(String message, double expected, double actual, double delta) instead
static void assertEquals (String message, double expected, double actual, double delta)
Asserts that two doubles are equal to within a positive delta.
static void assertEquals (String message, float expected, float actual, float delta)
Asserts that two floats are equal to within a positive delta.
static void assertEquals (String message, long expected, long actual)
Asserts that two longs are equal.
static void assertEquals (String message, Object[] expecteds, Object[] actuals)
Deprecated. use assertArrayEquals
static void assertEquals (String message, Object expected, Object actual)
Asserts that two objects are equal.
static void assertFalse (boolean condition)
Asserts that a condition is false.
static void assertFalse (String message, boolean condition)
Asserts that a condition is false.
static void assertNotEquals (double unexpected, double actual, double delta)
Asserts that two doubles are not equal to within a positive delta.
static void assertNotEquals (float unexpected, float actual, float delta)
Asserts that two floats are not equal to within a positive delta.
static void assertNotEquals (long unexpected, long actual)
Asserts that two longs are not equals.
static void assertNotEquals (Object unexpected, Object actual)
Asserts that two objects are not equals.
static void assertNotEquals (String message, double unexpected, double actual, double delta)
Asserts that two doubles are not equal to within a positive delta.
static void assertNotEquals (String message, float unexpected, float actual, float delta)
Asserts that two floats are not equal to within a positive delta.
static void assertNotEquals (String message, long unexpected, long actual)
Asserts that two longs are not equals.
static void assertNotEquals (String message, Object unexpected, Object actual)
Asserts that two objects are not equals.
static void assertNotNull (Object object)
Asserts that an object isn’t null.
static void assertNotNull (String message, Object object)
Asserts that an object isn’t null.
static void assertNotSame (Object unexpected, Object actual)
Asserts that two objects do not refer to the same object.
static void assertNotSame (String message, Object unexpected, Object actual)
Asserts that two objects do not refer to the same object.
static void assertNull (Object object)
Asserts that an object is null.
static void assertNull (String message, Object object)
Asserts that an object is null.
static void assertSame (Object expected, Object actual)
Asserts that two objects refer to the same object.
static void assertSame (String message, Object expected, Object actual)
Asserts that two objects refer to the same object.
static
void
assertThat (String reason, T actual, Matcher matcher)
Deprecated. use org.hamcrest.MatcherAssert.assertThat()
static
void
assertThat (T actual, Matcher matcher)
Deprecated. use org.hamcrest.MatcherAssert.assertThat()
static

T
assertThrows (Class expectedThrowable, ThrowingRunnable runnable)
Asserts that runnable throws an exception of type expectedThrowable when executed.
static

T
assertThrows (String message, Class expectedThrowable, ThrowingRunnable runnable)
Asserts that runnable throws an exception of type expectedThrowable when executed.
static void assertTrue (boolean condition)
Asserts that a condition is true.
static void assertTrue (String message, boolean condition)
Asserts that a condition is true.
static void fail ()
Fails a test with no message.
static void fail (String message)
Fails a test with the given message.
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Assert

Method Detail

assertTrue

Parameters: message — the identifying message for the AssertionError ( null okay) condition — condition to be checked

assertTrue

Parameters: condition — condition to be checked

assertFalse

Parameters: message — the identifying message for the AssertionError ( null okay) condition — condition to be checked

assertFalse

Parameters: condition — condition to be checked

Parameters: message — the identifying message for the AssertionError ( null okay) See Also: AssertionError

assertEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expected — expected value actual — actual value

assertEquals

Parameters: expected — expected value actual — the value to check against expected

assertNotEquals

Parameters: message — the identifying message for the AssertionError ( null okay) unexpected — unexpected value to check actual — the value to check against unexpected

assertNotEquals

Parameters: unexpected — unexpected value to check actual — the value to check against unexpected

assertNotEquals

Parameters: message — the identifying message for the AssertionError ( null okay) unexpected — unexpected value to check actual — the value to check against unexpected

assertNotEquals

Parameters: unexpected — unexpected value to check actual — the value to check against unexpected

assertNotEquals

Parameters: message — the identifying message for the AssertionError ( null okay) unexpected — unexpected value actual — the value to check against unexpected delta — the maximum delta between unexpected and actual for which both numbers are still considered equal.

assertNotEquals

Parameters: unexpected — unexpected value actual — the value to check against unexpected delta — the maximum delta between unexpected and actual for which both numbers are still considered equal.

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assertNotEquals

Parameters: unexpected — unexpected value actual — the value to check against unexpected delta — the maximum delta between unexpected and actual for which both numbers are still considered equal.

assertArrayEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — Object array or array of arrays (multi-dimensional array) with expected values. actuals — Object array or array of arrays (multi-dimensional array) with actual values Throws: org.junit.internal.ArrayComparisonFailure

assertArrayEquals

Parameters: expecteds — Object array or array of arrays (multi-dimensional array) with expected values actuals — Object array or array of arrays (multi-dimensional array) with actual values

assertArrayEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — boolean array with expected values. actuals — boolean array with expected values. Throws: org.junit.internal.ArrayComparisonFailure

assertArrayEquals

Parameters: expecteds — boolean array with expected values. actuals — boolean array with expected values.

assertArrayEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — byte array with expected values. actuals — byte array with actual values Throws: org.junit.internal.ArrayComparisonFailure

assertArrayEquals

Parameters: expecteds — byte array with expected values. actuals — byte array with actual values

assertArrayEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — char array with expected values. actuals — char array with actual values Throws: org.junit.internal.ArrayComparisonFailure

assertArrayEquals

Parameters: expecteds — char array with expected values. actuals — char array with actual values

assertArrayEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — short array with expected values. actuals — short array with actual values Throws: org.junit.internal.ArrayComparisonFailure

assertArrayEquals

Parameters: expecteds — short array with expected values. actuals — short array with actual values

assertArrayEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — int array with expected values. actuals — int array with actual values Throws: org.junit.internal.ArrayComparisonFailure

assertArrayEquals

Parameters: expecteds — int array with expected values. actuals — int array with actual values

assertArrayEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — long array with expected values. actuals — long array with actual values Throws: org.junit.internal.ArrayComparisonFailure

assertArrayEquals

Parameters: expecteds — long array with expected values. actuals — long array with actual values

assertArrayEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — double array with expected values. actuals — double array with actual values delta — the maximum delta between expecteds[i] and actuals[i] for which both numbers are still considered equal. Throws: org.junit.internal.ArrayComparisonFailure

assertArrayEquals

Parameters: expecteds — double array with expected values. actuals — double array with actual values delta — the maximum delta between expecteds[i] and actuals[i] for which both numbers are still considered equal.

assertArrayEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — float array with expected values. actuals — float array with actual values delta — the maximum delta between expecteds[i] and actuals[i] for which both numbers are still considered equal. Throws: org.junit.internal.ArrayComparisonFailure

assertArrayEquals

Parameters: expecteds — float array with expected values. actuals — float array with actual values delta — the maximum delta between expecteds[i] and actuals[i] for which both numbers are still considered equal.

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assertEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expected — expected value actual — the value to check against expected delta — the maximum delta between expected and actual for which both numbers are still considered equal.

assertEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expected — expected value actual — the value to check against expected delta — the maximum delta between expected and actual for which both numbers are still considered equal.

assertNotEquals

Parameters: message — the identifying message for the AssertionError ( null okay) unexpected — unexpected value actual — the value to check against unexpected delta — the maximum delta between unexpected and actual for which both numbers are still considered equal.

assertEquals

Parameters: expected — expected long value. actual — actual long value

assertEquals

Parameters: message — the identifying message for the AssertionError ( null okay) expected — long expected value. actual — long actual value

assertEquals


assertEquals


assertEquals

Parameters: expected — expected value actual — the value to check against expected delta — the maximum delta between expected and actual for which both numbers are still considered equal.

assertEquals

Parameters: expected — expected value actual — the value to check against expected delta — the maximum delta between expected and actual for which both numbers are still considered equal.

assertNotNull

Parameters: message — the identifying message for the AssertionError ( null okay) object — Object to check or null

assertNotNull

Parameters: object — Object to check or null

assertNull

Parameters: message — the identifying message for the AssertionError ( null okay) object — Object to check or null

assertNull

Parameters: object — Object to check or null

assertSame

Parameters: message — the identifying message for the AssertionError ( null okay) expected — the expected object actual — the object to compare to expected

assertSame

Parameters: expected — the expected object actual — the object to compare to expected

assertNotSame

Parameters: message — the identifying message for the AssertionError ( null okay) unexpected — the object you don’t expect actual — the object to compare to unexpected

assertNotSame

Parameters: unexpected — the object you don’t expect actual — the object to compare to unexpected

assertEquals

Asserts that two object arrays are equal. If they are not, an AssertionError is thrown with the given message. If expecteds and actuals are null , they are considered equal.

Parameters: message — the identifying message for the AssertionError ( null okay) expecteds — Object array or array of arrays (multi-dimensional array) with expected values. actuals — Object array or array of arrays (multi-dimensional array) with actual values

assertEquals

Asserts that two object arrays are equal. If they are not, an AssertionError is thrown. If expected and actual are null , they are considered equal.

Parameters: expecteds — Object array or array of arrays (multi-dimensional array) with expected values actuals — Object array or array of arrays (multi-dimensional array) with actual values

assertThat

Asserts that actual satisfies the condition specified by matcher . If not, an 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 can be meaningfully applied only to values that could be assigned to a variable of type T .

Type Parameters: T — the static type accepted by the matcher (this can flag obvious compile-time problems such as assertThat(1, is(«a»)) Parameters: actual — the computed value being compared matcher — an expression, built of Matcher s, specifying allowed values See Also: CoreMatchers

assertThat

Asserts that actual satisfies the condition specified by matcher . If not, an 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 can be meaningfully applied only to values that could be assigned to a variable of type T .

Type Parameters: T — the static type accepted by the matcher (this can flag obvious compile-time problems such as assertThat(1, is(«a»)) Parameters: reason — additional information about the error actual — the computed value being compared matcher — an expression, built of Matcher s, specifying allowed values See Also: CoreMatchers

assertThrows

Parameters: expectedThrowable — the expected type of the exception runnable — a function that is expected to throw an exception when executed Returns: the exception thrown by runnable Since: 4.13

Источник

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