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Overview

Parsaa can generate unit tests for your Swift code using the XCTest framework. It analyzes your code to identify testable behaviors, edge cases, and error conditions, then produces test cases you can add directly to your test target.
Parsaa generates tests using Apple’s XCTest framework — the standard testing framework for Swift and Xcode projects.

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What It Generates

Test Cases

XCTestCase subclasses with well-structured test methods covering the behavior of your code.

Setup & Teardown

setUp() and tearDown() methods that initialize and clean up test dependencies.

Edge Case Tests

Tests for boundary conditions, empty inputs, nil values, and other edge cases your code should handle.

Mocks & Stubs

Mock objects and stubs for dependencies, so your tests are isolated and repeatable.

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How to Use

1

Select code or a file

Highlight a function, class, or file in Xcode that you want to test.
2

Ask Parsaa to generate tests

In the chat, ask Parsaa to write tests — for example, “Generate unit tests for this class” or “Write tests for this function.”
3

Review the generated tests

Parsaa produces a complete test file. Review the test cases to make sure they cover meaningful behavior and edge cases.
4

Add to your test target

Add the generated test file to your Xcode project’s test target. Run the tests to verify they pass.

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Example

Input — a function to test: 
struct PriceCalculator {
    func calculateTotal(items: [Item], taxRate: Double) -> Double {
        let subtotal = items.reduce(0.0) { $0 + $1.price }
        let tax = subtotal * taxRate
        return subtotal + tax
    }
}
Generated tests: 
import XCTest
@testable import MyApp

final class PriceCalculatorTests: XCTestCase {

    var calculator: PriceCalculator!

    override func setUp() {
        super.setUp()
        calculator = PriceCalculator()
    }

    func testCalculateTotal_withMultipleItems() {
        let items = [
            Item(name: "A", price: 10.0),
            Item(name: "B", price: 20.0)
        ]
        let total = calculator.calculateTotal(items: items, taxRate: 0.1)
        XCTAssertEqual(total, 33.0, accuracy: 0.01)
    }

    func testCalculateTotal_withEmptyItems() {
        let total = calculator.calculateTotal(items: [], taxRate: 0.1)
        XCTAssertEqual(total, 0.0, accuracy: 0.01)
    }

    func testCalculateTotal_withZeroTaxRate() {
        let items = [Item(name: "A", price: 25.0)]
        let total = calculator.calculateTotal(items: items, taxRate: 0.0)
        XCTAssertEqual(total, 25.0, accuracy: 0.01)
    }
}

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Best Practices

Always review generated tests. AI-generated tests are a starting point. Verify they test meaningful behavior, not just implementation details. Check that assertions are correct and edge cases are realistic.
Good tests verify what your code does, not how it does it. If Parsaa generates a test that relies on internal implementation details, refactor it to test the public interface instead.
Double-check that expected values in assertions are correct. AI can miscalculate expected outputs, especially for complex logic.
Parsaa covers common edge cases, but you know your domain best. Add tests for scenarios specific to your business logic.
Each test should be independent. If Parsaa generates tests that share mutable state, refactor them to use fresh setup in each test method.
Use test generation as a starting point, then iterate. Generated tests get you to 70-80% coverage quickly — you fill in the domain-specific gaps.