Assertions and Grid In Selenium

Introduction

Assertions are a means for tester or developers or users to determines the state of the application whether the state is the same as what we are expecting or not. It is used to validate any kind of test. It always provides a result on the basis of actually expected result comparison. Failed assertions indicate the failed test cases and stopped executions. Whenever the result of assertions show no exception it means test is considered passed. Therefore we can say that assertions paly one of the most important roles in identifying the flow of application being tested.

Types of Assertions:

1. Soft  Assertion.

2. Hard Assertion.

Hard Assertion: It throws AssertException when the test cases are failed. Error in these cases is handled by using catch block. 
Following method are available in hard Assertions:

1. Assert Equals

2. AssertNotEquals

3. AssertTrue

4. AssertFalse

5. AssertNull

6. AssertNotNull

Soft Assertion: To overcome problems like when someone wants to execute the whole script if the assertion failed then we use soft assertions in testing.

Selenium Grid: It is a feature in selenium using this user can run test cases in different machines across different platforms. In local machine control triggering of test cases are available and when the user triggered the test cases then test cases are automatically executed by the remote machine. Initially, test cases are written in local machines and executed on the same. Users can run test cases in parallel in multiple machines on the selenium grid.

Architecture of Selenium Grid

Hub: It’s a central point or local machine which receives all the test case requests and it distributes them to the right nodes.
Basically hub is the machine that triggers the test cases. And it should be only one in the selenium grid.

Node: These are the selenium instances that will execute the test cases that you loaded on the hub. With different platforms and browsers  nodes can be launched on multiple machines.

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