
AtomicJar was the commercial company behind Testcontainers, the popular open-source integration testing library. Founded in 2021 by the original creators and maintainers of Testcontainers, AtomicJar built Testcontainers Cloud — a cloud-based test infrastructure service that allowed teams to run container-based integration tests without local Docker requirements. The company raised $25M in January 2023 before being acquired by Docker, Inc. in December 2023.
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