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BAEL-637 Pre conditions (#1054) 

* BAL-36 File size api in java and apache commons IO

* BAEL-282 grep in java - fixes after code review

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor

* BAEL-519 Moved all supporting classes to main source

* BAEL-519 Moved all supporting classes to main source

* BAEL-519 Moved asserts and test classes in test folder.

* BAEL-519 moved test related producer and consumer to src.

* BAEL-586 Guide to Guava BiMap.

* BAEL-587 formatted code.

* BAEL-519 LMAX Disruptor

* BAEL-587 resolved merge

* BAEL-587 Resolved merge

* BAEL-519 Removed disruptor link.

* BAEL-519 Reverted Guava changes

* RFQ-587 Added disruptor as a separate module.

* BAEL-519 Disruptor changes.

* BAEL-519 Removed disruptor from core-java module.

* BAEL-637 Guide to PreConditions
This commit is contained in:
Muhammed Almas 2017-01-28 03:55:42 +05:30 committed by Zeger Hendrikse
parent 6f9e6e0f20
commit ed6e3f56a5
1 changed files with 141 additions and 0 deletions
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141
guava/src/test/java/org/baeldung/guava/GuavaPreConditionsTest.java Normal file
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package org.baeldung.guava;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.util.Arrays;
import org.junit.Test;
import static com.google.common.base.Preconditions.*;
public class GuavaPreConditionsTest {
@Test(expected = IllegalArgumentException.class)
public void whenCheckArgumentEvaluatesFalse_throwsException() {
int age = -18;
checkArgument(age > 0);
}
@Test
public void givenErrorMessage_whenCheckArgumentEvaluatesFalse_throwsException() {
final int age = -18;
final String message = "Age can't be zero or less than zero";
try {
checkArgument(age > 0, message);
} catch (IllegalArgumentException illegalArgumentException) {
assertEquals(message, illegalArgumentException.getMessage());
}
}
@Test
public void givenTemplatedErrorMessage_whenCheckArgumentEvaluatesFalse_throwsException() {
final int age = -18;
final String message = "Age can't be zero or less than zero, you supplied %s.";
try {
checkArgument(age > 0, message, age);
} catch (IllegalArgumentException illegalArgumentException) {
final String formattedMessage = String.format(message, age);
assertEquals(formattedMessage, illegalArgumentException.getMessage());
}
}
@Test(expected = IndexOutOfBoundsException.class)
public void givenArrayOfIntegers_whenCheckElementIndexEvaluatesFalse_throwsException() {
final int[] numbers = { 1, 2, 3, 4, 5 };
checkElementIndex(6, numbers.length - 1);
}
@Test
public void givenArrayOfIntegersAndMessage_whenCheckElementIndexEvaluatesFalse_throwsException() {
final int[] numbers = { 1, 2, 3, 4, 5 };
final String message = "Please check the bound of an array and retry";
try {
checkElementIndex(6, numbers.length - 1, message);
} catch (IndexOutOfBoundsException indexOutOfBoundsException) {
assertTrue(indexOutOfBoundsException.getMessage().startsWith(message));
}
}
@Test(expected = NullPointerException.class)
public void givenNullString_whenCheckNotNullCalled_throwsException() {
final String nullObject = null;
checkNotNull(nullObject);
}
@Test
public void givenNullString_whenCheckNotNullCalledWithMessage_throwsException() {
final String nullObject = null;
final String message = "Please check the Object supplied, its null!";
try {
checkNotNull(nullObject, message);
} catch (NullPointerException nullPointerException) {
assertEquals(message, nullPointerException.getMessage());
}
}
@Test
public void givenNullString_whenCheckNotNullCalledWithTemplatedMessage_throwsException() {
final String nullObject = null;
final String message = "Please check the Object supplied, its %s!";
try {
checkNotNull(nullObject, message, nullObject);
} catch (NullPointerException nullPointerException) {
final String formattedMessage = String.format(message, nullObject);
assertEquals(formattedMessage, nullPointerException.getMessage());
}
}
@Test(expected = IndexOutOfBoundsException.class)
public void givenArrayOfIntegers_whenCheckPositionIndexEvaluatesFalse_throwsException() {
final int[] numbers = { 1, 2, 3, 4, 5 };
checkPositionIndex(6, numbers.length - 1);
}
@Test
public void givenArrayOfIntegersAndMessage_whenCheckPositionIndexEvaluatesFalse_throwsException() {
final int[] numbers = { 1, 2, 3, 4, 5 };
final String message = "Please check the bound of an array and retry";
try {
checkPositionIndex(6, numbers.length - 1, message);
} catch (IndexOutOfBoundsException indexOutOfBoundsException) {
assertTrue(indexOutOfBoundsException.getMessage().startsWith(message));
}
}
@Test(expected = IndexOutOfBoundsException.class)
public void givenArrayOfIntegers_whenCheckPositionIndexesEvaluatesFalse_throwsException() {
final int[] numbers = { 1, 2, 3, 4, 5 };
checkPositionIndexes(6, 0, numbers.length - 1);
}
@Test(expected = IllegalStateException.class)
public void givenValidStates_whenCheckStateEvaluatesFalse_throwsException() {
final int[] validStates = { -1, 0, 1 };
final int givenState = 10;
checkState(Arrays.binarySearch(validStates, givenState) > 0);
}
@Test
public void givenValidStatesAndMessage_whenCheckStateEvaluatesFalse_throwsException() {
final int[] validStates = { -1, 0, 1 };
final int givenState = 10;
final String message = "You have entered an invalid state";
try {
checkState(Arrays.binarySearch(validStates, givenState) < 0, message);
} catch (IllegalStateException IllegalStateException) {
assertEquals(message, IllegalStateException.getMessage());
}
}
@Test
public void givenValidStatesAndTemplatedMessage_whenCheckStateEvaluatesFalse_throwsException() {
final int[] validStates = { -1, 0, 1 };
final int givenState = 10;
final String message = "State can't be %s, It can be one of %s.";
try {
checkState(Arrays.binarySearch(validStates, givenState) < 0, message, givenState, Arrays.toString(validStates));
} catch (IllegalStateException IllegalStateException) {
final String formattedMessage = String.format(message, givenState, Arrays.toString(validStates));
assertEquals(formattedMessage, IllegalStateException.getMessage());
}
}
}