Explain in detail about black box testing, Software Engineering

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Explain in detail about Black box testing.

Black box or behavioural testing focuses on the functional needs of the software.
It is applied during the last phase of testing.
Syntax driven testing is suitable for the specification which are explained by a certain grammar.
Decision table based testing is executed when the original software requirement have been formulated in the format of " if-then" statements.
Liquid level control is the study of a simple control problem which is intended to check the liquid level. It has 2 sensors.

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