Jmeter assertions from scratch part 3

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okay, let's dive into the exciting world of jmeter assertions, building upon our previous tutorials. this comprehensive guide will explore various assertion types, their functionalities, how to use them effectively, and even a touch of scripting for dynamic validation.

**recap of part 1 & 2**

* **part 1:** we covered the fundamentals of jmeter, creating basic test plans, understanding thread groups, samplers (like http request), and listeners (like view results tree).
* **part 2:** we explained assertions in detail and covered response assertion and duration assertion.

**part 3: more jmeter assertions and scripting (beanshell & jsr223)**

this part will cover:

1. **size assertion:** verifying response size.
2. **html assertion:** validating html structure.
3. **xml assertion:** validating xml responses against schema.
4. **json assertion:** validating json responses (using json path).
5. **beanshell assertion:** custom assertion logic using beanshell scripting.
6. **jsr223 assertion:** custom assertion logic using more modern scripting languages (e.g., groovy).
7. **advanced assertion strategies:** conditional assertions, error handling.

**prerequisites:**

* jmeter installed (latest version recommended).
* basic understanding of jmeter interface and test plan creation.
* familiarity with regular expressions (for response assertion).
* basic knowledge of html, xml, and json formats.
* (optional) basic knowledge of groovy is an added advantage.

**1. size assertion**

the size assertion checks whether the response size (in bytes) meets specified criteria. it's useful for verifying if a file download is complete, or if a response is within expected size limits.

* **use cases:**
* checking the size of a downloaded image or document.
* ensuring a response doesn't exceed a certain size to prevent performance issues.
* validating that a minimum amount of data is returned.

* **configuration:**

1. **add size assertio ...

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performance testing
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error checking
throughput
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API testing
user experience
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metrics analysis

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