Added a tutorial section in the docs for an API test using nodeJS and catalyst

docs/src/guides/write-my-first-test.md

@@ -0,0 +1,123 @@
+# Tutorial: Your First API Test
+
+This tutorial will guide you through writing with **Node.js** and running your first API tests with **Catalyst**
+against a simple local web server.
+
+## Step 1: Create a Sample Project (example with nodeJS)
+
+First, let's create a new directory for our project and set up a very simple Rust web server to
+test against.
+
+### Folder Structure
+
+```code
+my-api-tests/
+    ├── server.js    # nodejs server
+    └── tests.toml   #
+    └── ...
+```
+
+### 1. Create a new project directory:
+
+    1. mkdir my-api-tests
+    2. cd my-api-tests
+
+### 2. Create a new file named server.js
+
+Add the following code. This will be our server.
+
+```javascript
+// server.js
+import express from "express";
+import cors from "cors";
+const PORT = process.env.PORT || 8000;
+
+const app = express();
+
+app.use(cors({ origin: "*" }));
+
+app.get("/hello/:usename", (req, res) => {
+  const { username } = req.params;
+  res.status(200).send(`Hello ${username}`);
+});
+
+app.set("json spaces", 2);
+app.listen(PORT, () => console.log("Server connected on Port : ", PORT));
+```
+
+## Step 2: Write Your Catalyst Tests
+
+Now, let's write the tests for our API.
+
+### Create a new test file and add the following:
+
+```toml
+    1     [config]
+    2     base_url = "http://localhost:8080"
+    3     default_headers = { "Content-Type" = "application/json" }
+    4
+    5     # test get a hello follow by the name
+    6     [[tests]]
+    7     name = "Greet"
+    8     method = "GET"
+    9     endpoint = "/hello/Ismael"
+   10
+   11     expected_status = 200
+   12
+```
+
+**NB:** The file name can be any name. In our example we use `test.toml`
+
+## Step 3: Run Your Tests
+
+### 1. First, start your sample API server in a separate terminal:
+
+```bash
+   node server.js
+```
+
+### 2. In your project directory, run Catalyst:
+
+```bash
+    catalyst  run --file tests.toml
+```
+
+- More running tests commands here : [Running Tests](../getting_started/running_tests.md)
+
+### 3. Expected Output:
+
+**Output for success result**
+
+```bash
+✔ Loaded tests from tests.toml
+✔ Base URL set to http://localhost:8000
+✔ Default headers: { "Content-Type": "application/json" }
+
+→ Running test: Greet
+  GET http://localhost:8000/hello/ismael
+  [PASS] Greet                        (200 Success)
+
+
+Test Summary:
+Total: 1, Passed: 1, Failed: 2
+```
+
+**Output for a failed result**
+
+```bash
+$ catalyst run --file tests.toml
+
+✔ Loaded tests from tests.toml
+✔ Base URL set to http://localhost:8080
+✔ Default headers: { "Content-Type": "application/json" }
+
+  Running API tests...
+  GET http://localhost:8080/hello/
+  [FAIL] Greet                        (404 Not Found) (expected 200)
+
+Failed tests:
+  - Greet
+
+Test Summary:
+Total: 1, Passed: 0, Failed: 1
+```