testcontainer/formula

Types

Formula

opaque </>

A Formula combines a ContainerSpec with a typed extraction function.

When testcontainer.with_formula/2 starts the container it calls extract on the running Container to produce a service-specific output type (e.g. PostgresContainer, RedisContainer).

Formulas are defined in the companion package testcontainer_formulas, not in this core package. The core only defines the type and the lifecycle entry point.

use pg <- testcontainer.with_formula(postgres.formula(config)) // pg has type PostgresContainer with .connection_url, .host, .port, …

pub opaque type Formula(output)

Values

new

</>

pub fn new(
  spec: container.ContainerSpec,
  extract: fn(container.Container) -> Result(output, error.Error),
) -> Formula(output)

Create a Formula from a ContainerSpec and an extraction function. Called by formula modules (e.g. testcontainer_formulas/postgres).