Testing Guidelines

June 1, 2026 · View on GitHub

When making changes in the project, please make sure that the corresponding tests are not failing.

Quality Gates

These rules are non-negotiable and apply to every change that touches production code.

Definition of Done for any code change

A change is NOT done until ALL of the following are true:

Tests exist for every newly added or modified code path.
- New public function/class → new unit test covering happy path + at least one edge case.
- Bug fix → a regression test that fails WITHOUT the fix and passes WITH it.
- Behavior change → existing tests updated to reflect the new contract.
Tests actually run and pass locally via ./gradlew jvmTest (and jsTest if the module has a JS target). Do NOT report a task as complete based on "it compiles". Compilation ≠ tests pass.
./gradlew build succeeds for the affected modules before the change is handed back to the user.
No suppressed warnings, no @Ignore, no @Disabled, no commented-out assertions were introduced to make tests pass.
Public API changes (new/removed/renamed public symbols) are documented with KDoc.

If any gate fails, fix the underlying issue. Do NOT weaken the test, disable it, or mark the task complete with a caveat. If the gate genuinely cannot be satisfied, stop and ask the user.

Test planning checklist (use before writing any test)

Before writing a test, make sure these points are clear:

What behavior is under test? (not "what function" — what observable behavior)
What are the inputs / preconditions? Include the boundary and error cases.
What is the expected observable outcome? Return value, thrown exception, state change, emitted event.
What is the minimal test double setup? Prefer the framework's getMockExecutor / mockTool over hand-rolled mocks.
Which source set does the test belong in? (commonTest when platform-agnostic, else jvmTest / jsTest.)

If any of these is unclear, the implementation itself is probably under-specified — pause and clarify.

Verification checklist

Before considering the change complete, confirm:

Which tests were added or modified (file paths + test names).
The exact Gradle command that was run and its result (pass/fail count).
Whether any Quality Gate was skipped, and why.

If this checklist cannot be filled in truthfully, the task is not done.

Running unit tests

This project uses Kotlin Multiplatform with JVM tests located in the jvmTest source sets.

Running all JVM tests

To run all JVM tests in the project:

./gradlew jvmTest

Running tests from a specific module

To run JVM tests from a specific module:

./gradlew :<module>:jvmTest

For example, to run JVM tests from the agents-test module:

./gradlew :agents:agents-test:jvmTest

Running a specific test class

To run a specific test class:

./gradlew :<module>:jvmTest --tests "fully.qualified.TestClassName"

For example:

./gradlew :agents:agents-test:jvmTest --tests "ai.koog.agents.test.SimpleAgentMockedTest"

Running integration tests

Integration tests are located in the integration-tests module and are used to test interactions with external LLM services.

Running all integration tests

To run all integration tests in the project:

./gradlew jvmIntegrationTest

Running integration tests from a specific module

To run integration tests from a specific module:

./gradlew :<module>:jvmIntegrationTest

For example, to run integration tests from the integration-tests module:

./gradlew :integration-tests:jvmIntegrationTest

Running a specific integration test

Integration test methods are prefixed with integration_ to distinguish them from unit tests. To run a specific integration test:

./gradlew :<module>:jvmIntegrationTest --tests "fully.qualified.TestClassName.integration_testMethodName"

For example:

./gradlew :integration-tests:jvmIntegrationTest --tests "ai.koog.integration.tests.SingleLLMPromptExecutorIntegrationTest.integration_testExecute"

Required API tokens for integration tests

Integration tests that interact with LLM services require API tokens to be set as environment variables:

ANTHROPIC_API_TEST_KEY - Required for tests using Anthropic's Claude models
DEEPSEEK_API_TEST_KEY - Required for tests using DeepSeek
GEMINI_API_TEST_KEY - Required for tests using Google's Gemini models
MISTRAL_AI_API_TEST_KEY - Required for tests using MistralAI
OPEN_AI_API_TEST_KEY - Required for tests using OpenAI's models
OPEN_ROUTER_API_TEST_KEY - Required for tests using OpenRouter

You need to set these environment variables before running the integration tests that use the corresponding LLM clients. To simplify development, you can also create env.properties file (already gitignored) using env.template.propertes as a template. Then properties specified there would be automatically applied as environment variables when you run any test task.

Skipping tests for specific LLM providers

If you don't have API keys for certain LLM providers, you can skip the tests for those providers using the skip.llm.providers system property. This is useful when you want to run integration tests but only have API keys for some of the providers.

To skip tests for specific providers, use the -Dskip.llm.providers flag with a comma-separated list of provider IDs:

./gradlew :integration-tests:jvmIntegrationTest -Dskip.llm.providers=openai,google

This will skip all tests that use OpenAI and Google models, but still run tests for other providers like Anthropic.

Available provider IDs:

openai - Skip tests using OpenAI models
anthropic - Skip tests using Anthropic models
google - Skip tests using Google models
deepseek - Skip tests using DeepSeek models
openrouter - Skip tests using OpenRouter models

You can also run a specific test class with provider skipping:

./gradlew :integration-tests:jvmIntegrationTest --tests "ai.koog.integration.tests.AIAgentIntegrationTest" -Dskip.llm.providers=anthropic,gemini

When tests are skipped due to provider filtering, they will be reported as "skipped" in the test results rather than "failed".

Running Ollama tests

Ollama tests are integration tests that use the Ollama LLM client. These tests are located in the integration-tests module and are prefixed with ollama_ to distinguish them from other integration tests.

Running Ollama tests with jvmOllamaTest

To run all Ollama tests in the project:

./gradlew jvmOllamaTest

To run Ollama tests from a specific module:

./gradlew :integration-tests:jvmOllamaTest

Running a specific Ollama test

To run a specific Ollama test:

./gradlew :integration-tests:jvmOllamaTest --tests "fully.qualified.TestClassName.ollama_testMethodName"

For example:

./gradlew :integration-tests:jvmOllamaTest --tests "ai.koog.integration.tests.OllamaClientIntegrationTest.ollama_test execute simple prompt"

Requirements for running Ollama tests

Option 1: Using Docker (default)

By default, Ollama tests use a Docker container to run the Ollama server. You need to:

Have Docker installed and running on your machine
Set the OLLAMA_IMAGE_URL environment variable to the URL of the Ollama image to use

For example:

export OLLAMA_IMAGE_URL="ollama/ollama:latest"

Option 2: Using a local Ollama client

Alternatively, you can use a local Ollama client:

Install Ollama from https://ollama.com/download
Pull the required model (e.g., llama3)
Comment out the @field:InjectOllamaTestFixture annotation in the test class
Manually specify the executor and model in the test

Example of modifying a test to use a local Ollama client:

// @ExtendWith(OllamaTestFixtureExtension::class)
class OllamaClientIntegrationTest {
    companion object {
        // @field:InjectOllamaTestFixture  // Comment out this line
        private lateinit var fixture: OllamaTestFixture

        // Manually initialize executor and model
        private val executor = SingleLLMPromptExecutor(OllamaClient("http://localhost:11434"))
        private val model = OllamaModels.Meta.LLAMA_3_2
    }

    // Test methods...
}

Note that when using a local Ollama client, you need to ensure that the model specified in the test is pulled and available in your local Ollama installation.