Asserts are very important in TestNG. They help us to verify the output of the test case. Without asserts, we will not know if the test case has passed or failed.
There are many types of asserts available in TestNG. Some of the most commonly used assertion methods are: assertTrue(), assertFalse(), and assertEquals().
TestNG Asserts help us verify the expected results with the actual results of a test case. If the assert condition is true, then the test case will pass, else it will fail. TestNG provides different types of asserts like hard assertions, soft assertions, timeouts etc.
Let’s understand each type of assertion in detail.
- Hard Assertions: Hard assertions immediately throw an AssertException if an assert fails and they do not continue with execution of subsequent tests. So if you have multiple test cases and one fails, rest of them won’t get executed. This is generally used when you want your test to fail fast if any verification fails.
- Soft Assertions: Soft assertions allow execution to continue even after an assert failure occurs. All soft assertion failures are reported at once after all tests have finished running.
This is useful when you have multiple tests and you want complete information about all failures before making a decision on whether or not to fix them. Timeouts: Timeouts cause a test to fail if it does not complete within a certain amount of time (specified in milliseconds).
Testng Assertions List
TestNG Assertions are the most important part of any test case. They help us verify the expected results with the actual results obtained from the application under test. In this blog post, we will discuss all the different types of assertions available in TestNG.
Before we get into the details of each assertion, let’s understand what an assertion is and why do we need them.An assertion is a statement that verifies the expected results with the actual results obtained from the application under test. We use assertions to validate if our tests are working as expected or not. If an assertion fails, it means that something is wrong with our test and we need to fix it.
There are 4 types of assertions available in TestNG:
- hard assert
- Soft assert
- time stamp
- no-op Hard Assertion
A hard assertion immediately throws an exception when it fails and halts the execution of subsequent tests. In other words, if a hard assert fails, then rest of the test cases after that point will not be executed. For example, if we have 5 test cases and 1st test case has a hard assert which fails, then only first test case will be executed and rest 4 cases will not be executed. This is generally used when you want your entire test suite to fail if even oneassertion fails .
- Soft Assertion :- A soft assertion does not throw an exception when it fails but recordsthe failure . This means that even if a soft assert fails , execution of subsequenttest cases will continue till end . At end , you can call softAssert . getAllMessages ( )to know which all asserts failed. For example , lets say we have 5test cases and 1sttest case has a soft assert which fail s , then all 5testcases will beexecuted but at end only firstassertwillfail .
- Time Stamp :- This is used to take timestamps at certain locations in your code soyou can later analyze how long each block took to execute
- No – Op : – As name suggests , this does nothing .
Testng Assertions Examples
In software testing, an assertion is a statement that specifies a logical condition that must be true at the end of the execution of a given test. If the condition is not true, then the test has failed. Assertions are used to detect errors and to verify the correctness of program behavior.
There are many different types of assertions, but they can generally be classified into two categories: those that check for a specific property or state, and those that check for a general relationship between two values. Specific assertions include checking for equality or inequality between two values, checking for nullity or non-nullity, and checking for membership in or absence from a given set. General assertions include checks for ordering (greater than/less than), existence (at least one/none), subset (is included in/is not included in), and so on.
TestNG provides built-in support for a wide range of assertion types. In this blog post, we’ll take a look at some examples of how to use TestNG assertions in your tests. Equality Assertions
One common type of assertion is the equality assertion, which checks that two values are equal. In TestNG, this is done with the assertEquals() method. This method takes two arguments: the first is the expected value, and the second is the actual value.
If these values are not equal, then the assertEquals() method will throw an AssertionError . For example, let’s say we have a function that calculates the sum of two numbers: public int add(int x, int y) { return x + y; } We can write a test case for this function using an equality assertion:
@Test public void testAdd() { int expected = 3; int actual = add(1, 2); assertEquals(expected , actual); } If we run this test case, it will pass because 1 + 2 does indeed equal 3 .
Hard And Soft Assertions in Testng
Assertions are an important part of any testing framework and provide a way to verify the expected behavior of your code. TestNG provides two types of assertions – hard and soft.
Hard assertions immediately fail the test when they encounter an unexpected behavior.
This means that no further tests will be executed and the test will be marked as a failure. Soft assertions, on the other hand, allow the execution to continue even after encountering an assertion failure. This type of assertion is useful when you want to verify multiple behaviors in a single test and do not want one failure to fail the entire test.
Both types of assertions can be used in conjunction with each other. For example, you could use a hard assertion to check for obvious failures and then use soft assertions to check for more subtle issues.
Which assertion you use depends on your particular needs but keep in mind that using too many soft assertions can make it difficult to identify which behavior caused the failure.
Softassert in Testng
What is a soft assert?
A soft assert is an assertion that doesn’t throw an exception when it fails. This means that if a soft assert fails, the test will continue to run.
This is useful for testing purposes because it allows you to test multiple assertions in one go, and report all failures at the end.
How do I use a soft assert?
Using a soft assert is easy.
In TestNG, you simply need to add the SoftAssert class as a listener:
@Listeners(SoftAssert.class)
public class MyTestClass { }
And then use thesoftAssert object in your tests:
@Test() // this test will continue even if verification1 or verification2 fail public void myTest() { SoftAssert softAssert = new SoftAssert(); // some code here softAssert.assertTrue(verification1()); softAssert.assertTrue(verification2()); // more code here // finally we call “assertAll” to trigger the verifications (if any failed) softAssert.assertAll(); } }
This is particularly useful when testing UI components, where you might want to check multiple properties of an element before considering the test failed (for example, checking both the text and color of a button).
Types of Assertions in Testng
As a software testing professional, it’s important to be familiar with the various types of assertions that are available in TestNG. Assertions are used to verify the expected results of a test case, and can be very useful in identifying bugs and errors in your code. There are four main types of assertions in TestNG: true, false, null and notNull.
- True Assertion: The true assertion verifies that the specified condition is true. If the condition is not true, then the assert fails and the test case is aborted.
- False Assertion: The false assertion verifies that the specified condition is false. If the condition is not false, then the assert fails and the test case is aborted.
- Null Assertion: The null assertion verifies that the specified object is null. If the object is not null, then the assert fails and the test case is aborted.
- Not Null Assertion: The not null assertion verifies that the specified object is not null.
Assertequals in Testng
Assert.equals in TestNG is a very useful tool that allows you to compare two values and see if they are equal. This can be extremely helpful when testing code, as it allows you to quickly and easily see if the code is behaving as expected. There are a few different ways to use Assert. equals, but the most common way is to simply pass in two values that you want to compare.
If the values are equal, then TestNG will return true, otherwise it will return false. One of the great things about Assert.equals is that it can be used with any data type, including strings, integers, floats, etc. This makes it a very versatile tool that can be used in a variety of situations.
Another great thing about Assert.equals is that it provides detailed information about why the comparison failed, if it does fail. This can be extremely helpful in debugging code, as it can help you pinpoint where the problem lies.
Testng Asserttrue
TestNG is a powerful testing framework for Java that helps streamline your testing process. One of its many features is the ability to assertions. Assertions allow you to verify the state of your application and ensure that it is behaving as expected.
There are two types of assertions in TestNG: hard and soft. Hard assertions immediately fail the test if they are not met, while soft assertions only record failures but don’t actually stop the test from continuing. This can be useful if you want to check for multiple conditions and only fail the test if all of them are not met.
To use an assertion, simply call the assertTrue() method and pass in a condition that should evaluate to true. For example, you might want to check that a certain object is not null before proceeding with further processing:
assertTrue(myObject != null);
If myObject is indeed null, this assertion will fail and the test will stop running. Otherwise, it will continue on normally.
You can also use an assertion to check that a certain condition evaluates to false using the assertFalse() method:
Credit: www.youtube.com
What are Asserts in Testng?
An assert is a statement in code that defines an expected condition that must be true in order for the program to continue running. If the condition is not met, the program will stop and an error message will be displayed. Asserts are typically used to verify the results of a test or calculation.
TestNG is a testing framework for Java programs that supports assertions. Assertions can be used to verify the expected outcome of a test case, and to abort the test if the outcome does not match the expected result. Assertions are written using TestNG’s org.testng.Assert class.
There are two types of assertions: hard and soft asserts. A hard assert immediately throws an AssertionError when it fails, aborting the current test case. A soft assert simply records a failure but allows execution of the test case to continue so that other failures can be reported as well.
By default, TestNG uses hard asserts, but this can be changed by setting the “assertionMode” attribute of the @Test annotation to “soft”.
How Do You Assert Values in Testng?
Assertions in TestNG are used to verify the expected results of a test case. By default, TestNG will throw an AssertionError if an assertion fails. To use assertions, you must first add the @Test annotation to your test method.
Then, add import org.testng.Assert; to your class file. Finally, call one of the assert methods provided by TestNG within your test method. For example:
@Test public void testMethod() { int num = 5; String str = “string”; Assert.assertEquals(num, 5); Assert.assertEquals(str, “string”);
What is Difference between Assert And Verify in Testng?
In TestNG, assertions are used to verify the expected results of a test case, while verifications are used to check if the test execution flow is as expected. Assertions will fail a test case if the expected result is not achieved, while verifications will not fail a test case even if the expected result is not achieved.
Both assertions and verifications can be used to check for conditions such as whether an element is present on a page or whether a text is displayed on a page.
However, assertions can only be used to check for conditions that are required for the successful completion of a test case, while verifications can be used to check for conditions that are not required for the successful completion of a test case.
What is Assert And Types?
An assertion is a statement in code that indicates that something must be true. Assertions are used to verify assumptions made by the programmer and to ensure that invariants are not violated. If an assertion fails, it usually means there is a bug in the code.
There are two types of assertions: preconditions and postconditions. Preconditions are assertions that must be true before some code is executed. Postconditions are assertions that must be true after some code has been executed.
Preconditions can be used to verify that data is valid before it is used. For example, if you have a function that takes an array of integers as an argument, you may want to assert that the array contains only valid integers before using the data. Postconditions can be used to verify that data is still valid after it has been used.
For example, if you have a function that modifies an array of integers, you may want to assert that the array still contains only valid integers after the function has been called.
TestNG Tutorial #4 – How to Use Assertion in Selenium TestNG
Conclusion
TestNG Asserts help us verify the expected output with the actual output of a test case. If the assertion fails, then the test case is considered as failed. We can use TestNG Asserts to check whether the actual value is equal to the expected value, whether the actual value is not equal to the expected value, whether the actual value is true, etc.