An execution environment configured for testing. May consist of specific hardware, OS, network topology, configuration of the product under test, other application or system software, etc. The Test Plan for a project should enumerated the test beds(s) to be used.

Simply says Test bed means is ready Environment for testing is called as Test bed.

Test bed is the combination of Test Environment(h/w environment)and Supported s/w and Test engineer already prepared test scenarions,cases and data .
Test
H/w Environment+Test scenarios,Cases and test data = Test bed

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