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How to Generate Go Tests - Step by Step Guide

Note: This tool generates table-driven test templates for Go functions. It works best with standard types and may require manual customization for complex interfaces, channels, or custom types.

Step 1

Paste Your Go Code

Copy and paste your Go functions into the input editor. The tool will automatically detect functions following Go testing best practices:

•
Exported and unexported functions: Generates tests for all function types
•
Parameters and return types: Automatically creates table-driven test structures
•
Method receivers: Handles both pointer and value receivers automatically

Example: Input Go Function

Here's a simple Go function you want to test:

package calculator

// Add returns the sum of two integers
func Add(a, b int) int {
    return a + b
}
Step 2

Review Generated Tests

The generator creates comprehensive test templates automatically:

•
Table-driven tests: Go best practice with multiple test cases in structs
•
Error handling: Automatic error tests for functions returning error types
•
Multiple returns: Tests for functions with (value, bool) or (value, error) patterns
•
TODO comments: Placeholders for values you need to customize

Example: Generated Test Code

The tool automatically generates this table-driven test:

package calculator

import "testing"

func TestAdd(t *testing.T) {
    tests := []struct {
        name string
        a    int
        b    int
        want int
    }{
        {name: "positive numbers", a: 2, b: 3, want: 5},
        // TODO: Add more test cases
    }
    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            if got := Add(tt.a, tt.b); got != tt.want {
                t.Errorf("Add() = %v, want %v", got, tt.want)
            }
        })
    }
}

Notice the table-driven structure with test cases and TODO comments for customization!

Step 3

Copy or Download Tests

Get your test code ready to use in your Go module:

•
Copy to clipboard: One-click copying to paste into your _test.go file
•
Download as file: Save as package_test.go for your project
•
Customize values: Replace TODO comments and add more test cases

Example: Running Your Tests

Save as calculator_test.go and run in terminal:

$ go test -v
=== RUN   TestAdd
=== RUN   TestAdd/positive_numbers
--- PASS: TestAdd (0.00s)
    --- PASS: TestAdd/positive_numbers (0.00s)
PASS
ok      calculator      0.002s

Your tests are ready to run with go test!

Frequently Asked Questions

What types of tests does this generator create?

The generator creates table-driven tests (Go best practice), error case tests for functions returning errors, tests for functions with multiple return values, and method tests for struct receivers. Each test includes a template structure with TODO comments for customization.

Do I need to modify the generated tests?

Yes, the generated tests are templates that need customization. You should add more test cases to the table, fill in expected values, and provide appropriate test data. The generator provides a solid starting point following Go testing conventions to save you time.

Does this work with all Go types?

The generator handles common primitive types (int, float64, bool, string), slices, maps, pointers, and error types. For custom types, interfaces, and channels, it provides TODO placeholders that you can fill in with appropriate test values.

Can I test methods with receivers?

Yes! The generator detects methods with both pointer and value receivers and creates appropriate test code that initializes the receiver struct. You'll need to customize the receiver initialization with appropriate field values for your tests.

How do I run the generated tests?

Save the generated code to a _test.go file in the same package as your code (e.g., calculator_test.go for calculator.go). Then run `go test` or `go test -v` in your terminal. The tests will be discovered and executed automatically by Go's testing framework.

Is this tool free to use?

Yes! The Go Test Generator is completely free to use. You can generate tests for as many functions as you need, with no registration or payment required. All processing is done in your browser for privacy and speed.

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