Derive the test surface for every feature and module. — svt_test

The test surface answers "what is there to test in this feature": the inputs a test must set (stimuli), the outputs and returned reactives it can assert on (observables), the intermediates between them, the trusted terminals, and the app-defined helpers it calls. Everything is derived from the subgraph — the app is never run.

Usage

svt_test_surface(features, inventory = NULL)

Arguments

features: An svt_features object.
inventory: An svt_inventory object, or NULL. Supplies the called-function set from which helpers are derived.

Value

An svt_test_surface object — a named list of per-subgraph surface records.

Details

The package targets testthat only: every feature and module surface is driven through shiny::testServer(), and each helper gets a plain testthat unit stub. Observables whose render function produces a value that cannot usefully be compared (renderPlot, renderUI, downloadHandler, ...) are annotated opaque and flagged SVT-W312, which points the assertion at the helper that computed the data.

Coverage in this layer means exercised, never correct.