Zelte Docs - Zero-Config API Testing

Overview

Assertions validate that your API responses match expected conditions. Zelte supports a wide range of assertion types for comprehensive testing.

Status Code Assertions

Check HTTP response status codes:

collection.yaml

assertions:
  - status == 200
  - status != 404
  - status >= 200 && status < 300
  - status == 201

Body Assertions

Validate response body content:

collection.yaml

assertions:
  # Equality checks
  - body.id == 123
  - body.name == "John Doe"
  - body.active == true

  # Null checks
  - body.token !== null
  - body.error === undefined

  # String operations
  - body.message contains "success"
  - body.email contains "@"

  # Array checks
  - body.users.length > 0
  - Array.isArray(body.items)

Header Assertions

Validate response headers:

collection.yaml

assertions:
  - headers.content-type == "application/json"
  - headers.authorization exists
  - headers.x-rate-limit-remaining > 0

Response Time Assertions

Ensure your API meets performance requirements:

collection.yaml

assertions:
  - responseTime < 1000    # Under 1 second
  - responseTime > 100     # At least 100ms
  - responseTime < 5000    # Under 5 seconds