Qu-Test brings together 13 service providers for a federated network of testbeds and 11 industrial users from the European quantum community. The network brings together competences and infrastructures across Europe to offer testing and validation services. A first goal of this cooperation is to support the creation of a trusted supply chain through the validation of quantum devices, chips, components and systems by the testbed network as an independent third party. A second goal is to discuss and agree on unified sets of parameters to characterize quantum devices. Methodologies and procedures will be harmonized among the partners of the testbed network in a step towards establishing standards for quantum technologies. Qu-Test is aligned along three testbeds: quantum computing, quantum communication, quantum sensing. In more detail, the Quantum Computing Testbed will measure, characterise and validate cryogenic quantum devices, cryogenic qubits such as superconducting and semiconducting qubits, photonics qubits and ion traps. The Quantum Communication Testbed will characterize devices for Quantum Key Distribution (QKD) and Quantum Random Number Generation (QRNG) and provide design and prototyping services to support innovation in the supply chain of quantum communication technologies. Finally, the Quantum Sensing Testbed will benchmark sensing and metrology instruments provided by industry and use a large suite of quantum sensors (clocks, gravimeters, magnetometers, imagers) to validate industrial use cases aiming at generating new business cases for quantum sensing and metrology devices. With additional services of IPR support, business coaching and innovation management, Qu-Test supports the European quantum industry with a holistic one-stop-shop to move the full ecosystem forward.