Basic assertions and verification methods in the Kotlin Test JS framework

Kotlin Test is a framework for testing the Kotlin application. It provides many basic assertions and verification methods to ensure the correctness of the code.This article will introduce the basic assertions and verification methods in KOTLIN TEST, and provide Java code examples. 1. Basic assertion method In Kotlin Test, the following basic assertions can be used to verify the behavior and output of the code: 1. Assertequals (Expected, Actual): Verify whether the two objects are equal.If the expected value is not equal to the actual value, the assertion will fail. assertEquals(5, calculateSum(2, 3)); 2. Asserttrue (Condition): The verification condition is true.If the conditions are not met, the assertion will fail. assertTrue(isValidUser(user)); 3. AssertFalse (Condition): Whether the verification conditions are fake.If the conditions are not met, the assertion will fail. assertFalse(isEmptyList(list)); 4. Assertnull (obj): The verification object is empty.If the object is not empty, the assertion will fail. assertNull(getUserById(userId)); 5. Assertnotnull (OBJ): Verify whether the object is empty.If the object is empty, the assertion will fail. assertNotNull(calculateResult()); 6. Assertsame (Expected, Actual): Verify whether the two objects quote the same instance.If the expectations are different from the actual object instance, the assertion will fail. assertSame(expectedUser, currentUser); 7. Assertnotsame (Expected, Actual): Verify whether the two objects quote different instances.If the expectations are the same as the actual object examples, the assertion will fail. assertNotSame(oldUser, updatedUser); 2. Verification method In addition to the basic assertion method, Kotlin Test also provides some verification methods to verify whether specific behavior or output meet the expectations: 1. AssertFails (BLOCK): Verify whether the code block is thrown abnormal.If the code block is not abnormal, the assertion will fail. assertFails { divideNumbers(10, 0) } 2. AssertnotFails (Block): Verify whether the code block is not abnormal.If the code block is thrown abnormal, assertion will fail. assertNotFails { calculateSum(2, 3) } 3. Asserttimeout (timeout, block): Verify whether the code block is executed within the specified time.If the code block exceeds the specified time, it is not completed, and the assertion will fail. assertTimeout(Duration.ofSeconds(5)) { performLongRunningTask() } 4. AssertdoesNottimeout (timeout, block): Verify whether the code block is executed within the specified time.If the code block is not executed within the specified time, the assertion will fail. assertDoesNotTimeout(Duration.ofMillis(500)) { performQuickTask() } 5. AssertContains (Expected, Actual): Verify whether the set or string contains a specified element or sub -string.If the set or string does not contain a specified element or sub -string, assertion will fail. assertContains("apple", fruitsList); assertContains("hello", greeting); Summarize: The basic assertions and verification methods in the Kotlin Test framework can be used to test the correctness of the Kotlin application.By using these methods, the code can ensure that the risk of potential errors can be reduced according to expected. I hope this article will help you understand the basic assertions and verification methods in Kotlin Test.