Programming language: Kotlin
License: MIT License
Tags: Tests    

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While TDD is a better approach for development, many projects don't practice it and end up with low test coverage.

This project is here to help you improve your test coverage by reducing the effort spent on writing boilerplate code, allowing you to focus on writing the actual tests.

Use TestIt to generate unit testing boilerplate from kotlin files.

Getting Started

While you can run ./gradlew run --args "filepath", it might be more convenient to set up a shortcut to the provided helper script:


  1. Get HomeBrew
  2. Run brew install coreutils
  3. Create a symbolic link: sudo ln -s /path/to/testit /usr/local/bin

Note: your project would need to include mockito 2 and mockito-kotlin or MockK.


Once installed, running TestIt is as simple as

testit path/to/file.kt

Or, to generate parameterized tests:

testit -p path/to/file.kt


TestIt generates a test file in the default expected path.

For example, when run against itself (testit app/src/main/java/com/mitteloupe/testit/TestIt.kt) - see source file - it generates the below file at app/src/test/java/com/mitteloupe/testit/TestItTest.kt:

package com.mitteloupe.testit

import com.mitteloupe.testit.config.PropertiesReader
import com.mitteloupe.testit.file.FileProvider
import com.mitteloupe.testit.generator.TestFilePathFormatter
import com.mitteloupe.testit.generator.TestsGeneratorFactory
import com.mitteloupe.testit.model.ClassTestCode
import com.mitteloupe.testit.parser.KotlinFileParser
import org.mockito.kotlin.mock
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.Mock
import org.mockito.junit.MockitoJUnitRunner

class TestItTest {
    private lateinit var cut: TestIt

    lateinit var propertiesReader: PropertiesReader

    lateinit var fileProvider: FileProvider

    lateinit var kotlinFileParser: KotlinFileParser

    lateinit var testFilePathFormatter: TestFilePathFormatter

    lateinit var testsGeneratorFactory: TestsGeneratorFactory

    fun setUp() {
        cut = TestIt(propertiesReader, fileProvider, kotlinFileParser, testFilePathFormatter, testsGeneratorFactory)

    fun `Given _ when getTestsForFile then _`() {
        // Given
        val fileName = "fileName"

        // When
        val actualValue = cut.getTestsForFile(fileName)

        // Then
        TODO("Define assertions")

    fun `Given _ when saveTestsToFile then _`() {
        // Given
        val sourceFileName = "sourceFileName"
        val classTestCode = mock<ClassTestCode>()

        // When
        cut.saveTestsToFile(sourceFileName, classTestCode)

        // Then
        TODO("Define assertions")

    fun `Given _ when showHelp then _`() {
        // Given

        // When

        // Then
        TODO("Define assertions")


  • Automatically compiles a list of required imports
  • Supports multiple classes in one Kotlin file
  • Supports overloaded functions
  • Supports both mockito 2 and MockK
  • Generates test code for abstract classes
  • Generates test code for extension functions
  • Generates test code for static functions
  • Generates parameterized tests code
  • Generates test code for exceptions
  • Configurable


This code uses a JAR from kotlin-grammar-tools to parse Kotlin code.

Created by

Eran Boudjnah


MIT © Eran Boudjnah

*Note that all licence references and agreements mentioned in the TestIt README section above are relevant to that project's source code only.