Why Testing Your Code Matters

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When we write code, we want it to work. But sometimes, it doesn’t. That’s where testing comes in.

Testing helps us check if our code is doing what we want. It tells us if something is broken, so we can fix it early — before it becomes a big problem.

Why Should We Test?

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Let’s say you make a function that adds two numbers. You think it works. But what if it doesn’t? You don’t want to find out later, when everything depends on it.

Testing is like asking your code:
“Hey, are you really doing your job?”

Types of Testing (The Basics)

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Here are the basic ones you’ll encounter:

As a beginner, we’ll mostly be doing unit testing.

Tools We Use: pytest

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We’ll use pytest, which is a powerful and easy-to-use testing tool in Python.

🔧 Install pytest:

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If you don’t have it yet, run this command:

A Simple Way to Test: pytest

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In Python, there’s a tool called pytest. It helps you test your code easily.

For example:

You write a function:

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def — Define a Function

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• def is short for define.
• It’s used to create a function in Python.

assert — Check if Something is True

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• assert is used to check if a condition is true.
• If it is true, Python does nothing and continues.
• If it’s false, Python throws an AssertionError.

This code is checking:

• Does add(2, 3) give 5?
• Does add(0, 0) give 0?
• And so on.

Testing with pytest

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Put this in a file called test_add.py, then run this in your terminal:

If all is good, you’ll see a green message.
If something is wrong, pytest will show you what failed.

Why Use pytest?

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• It’s simple to use
• The code is easy to read
• You get clear messages when something fails

Final Thoughts

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Testing might feel boring at first.
But it saves you time and trouble later.

Start small — test just one function.
It’s a good habit to build.

Your code will thank you.
And so will your future self.