Membrane.Testing.Pipeline.message_child

You're seeing just the function message_child, go back to Membrane.Testing.Pipeline module for more information.
Link to this function

message_child(pipeline, child, message)

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Specs

message_child(pid(), Membrane.Element.name_t(), any()) :: :ok

Sends message to a child by Element name.

Example

Knowing that pipeline has child named sink, message can be sent as follows:

message_child(pipeline, :sink, {:message, "to handle"})