1112人阅读
这两天看了Hadoop权威指南，发现其中大部分使用了JUNIT的断言，而且还有assertThat 、is 等方法，看来新版本的junit4没真正用起来！~~
若用这两个方法，可以使用eclipse中的junit 4 library包，包导入方式如下
import static org.junit.Assert.*;
import static org.hamcrest.core.Is.*;
具体assertThat, assertEquals, assertTrue 区别如下
以下载自 横刀天笑 的&
1: assertThat(userDAO.findAll(), hasItem(expected));
1: assertTrue(userDAO.findAll().contains(expected));
1: assertThat(userDAO.findAll(), not(hasItem(expected));
1: assertFalse(userDAO.findAll().contains(expected));
1: assertEquals(userDAO.findBy(id), expected);
1: assertThat(userDAO.findBy(id), is(expected));
参考知识库
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(3)(1)(1)(2)(1)(1)(1)(10)(7)(2)(2)(5)(16)(8)(2)(4)(6)(11)君，已阅读到文档的结尾了呢~~
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3秒自动关闭窗口Assert (JUnit API)
Class Assert
java.lang.Object
org.junit.Assert
public class Assertextends java.lang.Object
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:
import static org.junit.Assert.*;
assertEquals(...);
See Also:AssertionError
&&&&&&&&&&Protect constructor since it is a static only class
static&void
(byte[]&expecteds,
byte[]&actuals)
&&&&&&&&&&Asserts that two byte arrays are equal.
static&void
(char[]&expecteds,
char[]&actuals)
&&&&&&&&&&Asserts that two char arrays are equal.
static&void
(int[]&expecteds,
int[]&actuals)
&&&&&&&&&&Asserts that two int arrays are equal.
static&void
(long[]&expecteds,
long[]&actuals)
&&&&&&&&&&Asserts that two long arrays are equal.
static&void
(java.lang.Object[]&expecteds,
java.lang.Object[]&actuals)
&&&&&&&&&&Asserts that two object arrays are equal.
static&void
(short[]&expecteds,
short[]&actuals)
&&&&&&&&&&Asserts that two short arrays are equal.
static&void
(java.lang.String&message,
byte[]&expecteds,
byte[]&actuals)
&&&&&&&&&&Asserts that two byte arrays are equal.
static&void
(java.lang.String&message,
char[]&expecteds,
char[]&actuals)
&&&&&&&&&&Asserts that two char arrays are equal.
static&void
(java.lang.String&message,
int[]&expecteds,
int[]&actuals)
&&&&&&&&&&Asserts that two int arrays are equal.
static&void
(java.lang.String&message,
long[]&expecteds,
long[]&actuals)
&&&&&&&&&&Asserts that two long arrays are equal.
static&void
(java.lang.String&message,
java.lang.Object[]&expecteds,
java.lang.Object[]&actuals)
&&&&&&&&&&Asserts that two object arrays are equal.
static&void
(java.lang.String&message,
short[]&expecteds,
short[]&actuals)
&&&&&&&&&&Asserts that two short arrays are equal.
static&void
(double&expected,
double&actual)
&&&&&&&&&&Deprecated.&Use
assertEquals(double expected, double actual, double epsilon)
static&void
(double&expected,
double&actual,
double&delta)
&&&&&&&&&&Asserts that two doubles or floats are equal to within a positive delta.
static&void
(long&expected,
long&actual)
&&&&&&&&&&Asserts that two longs are equal.
static&void
(java.lang.Object[]&expecteds,
java.lang.Object[]&actuals)
&&&&&&&&&&Deprecated.&use assertArrayEquals
static&void
(java.lang.Object&expected,
java.lang.Object&actual)
&&&&&&&&&&Asserts that two objects are equal.
static&void
(java.lang.String&message,
double&expected,
double&actual)
&&&&&&&&&&Deprecated.&Use
assertEquals(String message, double expected, double actual, double epsilon)
static&void
(java.lang.String&message,
double&expected,
double&actual,
double&delta)
&&&&&&&&&&Asserts that two doubles or floats are equal to within a positive delta.
static&void
(java.lang.String&message,
long&expected,
long&actual)
&&&&&&&&&&Asserts that two longs are equal.
static&void
(java.lang.String&message,
java.lang.Object[]&expecteds,
java.lang.Object[]&actuals)
&&&&&&&&&&Deprecated.&use assertArrayEquals
static&void
(java.lang.String&message,
java.lang.Object&expected,
java.lang.Object&actual)
&&&&&&&&&&Asserts that two objects are equal.
static&void
(boolean&condition)
&&&&&&&&&&Asserts that a condition is false.
static&void
(java.lang.String&message,
boolean&condition)
&&&&&&&&&&Asserts that a condition is false.
static&void
(java.lang.Object&object)
&&&&&&&&&&Asserts that an object isn't null.
static&void
(java.lang.String&message,
java.lang.Object&object)
&&&&&&&&&&Asserts that an object isn't null.
static&void
(java.lang.Object&unexpected,
java.lang.Object&actual)
&&&&&&&&&&Asserts that two objects do not refer to the same object.
static&void
(java.lang.String&message,
java.lang.Object&unexpected,
java.lang.Object&actual)
&&&&&&&&&&Asserts that two objects do not refer to the same object.
static&void
(java.lang.Object&object)
&&&&&&&&&&Asserts that an object is null.
static&void
(java.lang.String&message,
java.lang.Object&object)
&&&&&&&&&&Asserts that an object is null.
static&void
(java.lang.Object&expected,
java.lang.Object&actual)
&&&&&&&&&&Asserts that two objects refer to the same object.
static&void
(java.lang.String&message,
java.lang.Object&expected,
java.lang.Object&actual)
&&&&&&&&&&Asserts that two objects refer to the same object.
(java.lang.String&reason,
org.hamcrest.Matcher&T&&matcher)
&&&&&&&&&&Asserts that actual satisfies the condition specified by
(T&actual,
org.hamcrest.Matcher&T&&matcher)
&&&&&&&&&&Asserts that actual satisfies the condition specified by
static&void
(boolean&condition)
&&&&&&&&&&Asserts that a condition is true.
static&void
(java.lang.String&message,
boolean&condition)
&&&&&&&&&&Asserts that a condition is true.
static&void
&&&&&&&&&&Fails a test with no message.
static&void
(java.lang.String&message)
&&&&&&&&&&Fails a test with the given message.
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
protected Assert()
Protect constructor since it is a static only class
assertTrue
public static void assertTrue(java.lang.String&message,
boolean&condition)
Asserts that a condition is true. If it isn't it throws an
AssertionError with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)condition - condition to be checked
assertTrue
public static void assertTrue(boolean&condition)
Asserts that a condition is true. If it isn't it throws an
AssertionError without a message.
Parameters:condition - condition to be checked
assertFalse
public static void assertFalse(java.lang.String&message,
boolean&condition)
Asserts that a condition is false. If it isn't it throws an
AssertionError with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)condition - condition to be checked
assertFalse
public static void assertFalse(boolean&condition)
Asserts that a condition is false. If it isn't it throws an
AssertionError without a message.
Parameters:condition - condition to be checked
public static void fail(java.lang.String&message)
Fails a test with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)See Also:AssertionError
public static void fail()
Fails a test with no message.
assertEquals
public static void assertEquals(java.lang.String&message,
java.lang.Object&expected,
java.lang.Object&actual)
Asserts that two objects are equal. If they are not, an
AssertionError is thrown with the given message. If
expected and actual are null,
they are considered equal.
Parameters:message - the identifying message for the AssertionError (null
okay)expected - expected valueactual - actual value
assertEquals
public static void assertEquals(java.lang.Object&expected,
java.lang.Object&actual)
Asserts that two objects are equal. If they are not, an
AssertionError without a message is thrown. If
expected and actual are null,
they are considered equal.
Parameters:expected - expected valueactual - the value to check against expected
assertArrayEquals
public static void assertArrayEquals(java.lang.String&message,
java.lang.Object[]&expecteds,
java.lang.Object[]&actuals)
throws org.junit.internal.ArrayComparisonFailure
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
org.junit.internal.ArrayComparisonFailure
assertArrayEquals
public static void assertArrayEquals(java.lang.Object[]&expecteds,
java.lang.Object[]&actuals)
Asserts that two object arrays are equal. If they are not, an
AssertionError is thrown. If expected and
actual are null, they are considered
Parameters:expecteds - Object array or array of arrays (multi-dimensional array) with
expected valuesactuals - Object array or array of arrays (multi-dimensional array) with
actual values
assertArrayEquals
public static void assertArrayEquals(java.lang.String&message,
byte[]&expecteds,
byte[]&actuals)
throws org.junit.internal.ArrayComparisonFailure
Asserts that two byte arrays are equal. If they are not, an
AssertionError is thrown with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)expecteds - byte array with expected values.actuals - byte array with actual values
org.junit.internal.ArrayComparisonFailure
assertArrayEquals
public static void assertArrayEquals(byte[]&expecteds,
byte[]&actuals)
Asserts that two byte arrays are equal. If they are not, an
AssertionError is thrown.
Parameters:expecteds - byte array with expected values.actuals - byte array with actual values
assertArrayEquals
public static void assertArrayEquals(java.lang.String&message,
char[]&expecteds,
char[]&actuals)
throws org.junit.internal.ArrayComparisonFailure
Asserts that two char arrays are equal. If they are not, an
AssertionError is thrown with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)expecteds - char array with expected values.actuals - char array with actual values
org.junit.internal.ArrayComparisonFailure
assertArrayEquals
public static void assertArrayEquals(char[]&expecteds,
char[]&actuals)
Asserts that two char arrays are equal. If they are not, an
AssertionError is thrown.
Parameters:expecteds - char array with expected values.actuals - char array with actual values
assertArrayEquals
public static void assertArrayEquals(java.lang.String&message,
short[]&expecteds,
short[]&actuals)
throws org.junit.internal.ArrayComparisonFailure
Asserts that two short arrays are equal. If they are not, an
AssertionError is thrown with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)expecteds - short array with expected values.actuals - short array with actual values
org.junit.internal.ArrayComparisonFailure
assertArrayEquals
public static void assertArrayEquals(short[]&expecteds,
short[]&actuals)
Asserts that two short arrays are equal. If they are not, an
AssertionError is thrown.
Parameters:expecteds - short array with expected values.actuals - short array with actual values
assertArrayEquals
public static void assertArrayEquals(java.lang.String&message,
int[]&expecteds,
int[]&actuals)
throws org.junit.internal.ArrayComparisonFailure
Asserts that two int arrays are equal. If they are not, an
AssertionError is thrown with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)expecteds - int array with expected values.actuals - int array with actual values
org.junit.internal.ArrayComparisonFailure
assertArrayEquals
public static void assertArrayEquals(int[]&expecteds,
int[]&actuals)
Asserts that two int arrays are equal. If they are not, an
AssertionError is thrown.
Parameters:expecteds - int array with expected values.actuals - int array with actual values
assertArrayEquals
public static void assertArrayEquals(java.lang.String&message,
long[]&expecteds,
long[]&actuals)
throws org.junit.internal.ArrayComparisonFailure
Asserts that two long arrays are equal. If they are not, an
AssertionError is thrown with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)expecteds - long array with expected values.actuals - long array with actual values
org.junit.internal.ArrayComparisonFailure
assertArrayEquals
public static void assertArrayEquals(long[]&expecteds,
long[]&actuals)
Asserts that two long arrays are equal. If they are not, an
AssertionError is thrown.
Parameters:expecteds - long array with expected values.actuals - long array with actual values
assertEquals
public static void assertEquals(java.lang.String&message,
double&expected,
double&actual,
double&delta)
Asserts that two doubles or floats are equal to within a positive delta.
If they are not, an 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
Parameters:message - the identifying message for the AssertionError (null
okay)expected - expected valueactual - the value to check against expecteddelta - the maximum delta between expected and
actual for which both numbers are still
considered equal.
assertEquals
public static void assertEquals(long&expected,
long&actual)
Asserts that two longs are equal. If they are not, an
AssertionError is thrown.
Parameters:expected - expected long value.actual - actual long value
assertEquals
public static void assertEquals(java.lang.String&message,
long&expected,
long&actual)
Asserts that two longs are equal. If they are not, an
AssertionError is thrown with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)expected - long expected value.actual - long actual value
assertEquals
@Deprecated
public static void assertEquals(double&expected,
double&actual)
Deprecated.&Use
assertEquals(double expected, double actual, double epsilon)
assertEquals
@Deprecated
public static void assertEquals(java.lang.String&message,
double&expected,
double&actual)
Deprecated.&Use
assertEquals(String message, double expected, double actual, double epsilon)
assertEquals
public static void assertEquals(double&expected,
double&actual,
double&delta)
Asserts that two doubles or floats are equal to within a positive delta.
If they are not, an 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
Parameters:expected - expected valueactual - the value to check against expecteddelta - the maximum delta between expected and
actual for which both numbers are still
considered equal.
assertNotNull
public static void assertNotNull(java.lang.String&message,
java.lang.Object&object)
Asserts that an object isn't null. If it is an AssertionError is
thrown with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)object - Object to check or null
assertNotNull
public static void assertNotNull(java.lang.Object&object)
Asserts that an object isn't null. If it is an AssertionError is
Parameters:object - Object to check or null
assertNull
public static void assertNull(java.lang.String&message,
java.lang.Object&object)
Asserts that an object is null. If it is not, an AssertionError
is thrown with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)object - Object to check or null
assertNull
public static void assertNull(java.lang.Object&object)
Asserts that an object is null. If it isn't an AssertionError is
Parameters:object - Object to check or null
assertSame
public static void assertSame(java.lang.String&message,
java.lang.Object&expected,
java.lang.Object&actual)
Asserts that two objects refer to the same object. If they are not, an
AssertionError is thrown with the given message.
Parameters:message - the identifying message for the AssertionError (null
okay)expected - the expected objectactual - the object to compare to expected
assertSame
public static void assertSame(java.lang.Object&expected,
java.lang.Object&actual)
Asserts that two objects refer to the same object. If they are not the
same, an AssertionError without a message is thrown.
Parameters:expected - the expected objectactual - the object to compare to expected
assertNotSame
public static void assertNotSame(java.lang.String&message,
java.lang.Object&unexpected,
java.lang.Object&actual)
Asserts that two objects do not refer to the same object. If they do
refer to the same object, an AssertionError is thrown with the
given message.
Parameters:message - the identifying message for the AssertionError (null
okay)unexpected - the object you don't expectactual - the object to compare to unexpected
assertNotSame
public static void assertNotSame(java.lang.Object&unexpected,
java.lang.Object&actual)
Asserts that two objects do not refer to the same object. If they do
refer to the same object, an AssertionError without a message is
Parameters:unexpected - the object you don't expectactual - the object to compare to unexpected
assertEquals
@Deprecated
public static void assertEquals(java.lang.String&message,
java.lang.Object[]&expecteds,
java.lang.Object[]&actuals)
Deprecated.&use assertArrayEquals
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
@Deprecated
public static void assertEquals(java.lang.Object[]&expecteds,
java.lang.Object[]&actuals)
Deprecated.&use assertArrayEquals
Asserts that two object arrays are equal. If they are not, an
AssertionError is thrown. If expected and
actual are null, they are considered
Parameters:expecteds - Object array or array of arrays (multi-dimensional array) with
expected valuesactuals - Object array or array of arrays (multi-dimensional array) with
actual values
assertThat
public static &T& void assertThat(T&actual,
org.hamcrest.Matcher&T&&matcher)
Asserts that actual satisfies the condition specified by
matcher. If not, an AssertionError is thrown with
information about the matcher and failing value. Example:
assertThat(0, is(1)); // fails:
// failure message:
// expected: is &1&
// got value: &0&
assertThat(0, is(not(1))) // passes
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 comparedmatcher - an expression, built of Matchers, specifying allowed
valuesSee Also:CoreMatchers,
assertThat
public static &T& void assertThat(java.lang.String&reason,
org.hamcrest.Matcher&T&&matcher)
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:
assertThat(&Help! Integers don't work&, 0, is(1)); // fails:
// failure message:
// Help! Integers don't work
// expected: is &1&
// got value: &0&
assertThat(&Zero is one&, 0, is(not(1))) // passes
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 erroractual - the computed value being comparedmatcher - an expression, built of Matchers, specifying allowed
valuesSee Also:CoreMatchers,