ExUnitJSON.Formatter (ex_unit_json v0.4.2)

ExUnit formatter that outputs test results as JSON.

This GenServer receives events from ExUnit during test execution and accumulates results. When the test suite finishes, it outputs a complete JSON document with all test results and summary statistics.

Usage

Configure ExUnit to use this formatter:

ExUnit.configure(formatters: [ExUnitJSON.Formatter])

Or use the mix test.json task which configures this automatically.

Events Handled

{:suite_started, opts} - Captures seed and start time
{:test_finished, test} - Accumulates individual test results
{:module_finished, module} - Tracks module-level failures (setup_all)
{:suite_finished, times_us} - Outputs final JSON

Summary

Types

t()

Formatter state accumulating test results during a test run

Functions

child_spec(init_arg)

Returns a specification to start this module under a supervisor.

Types

t()

@type t() :: %ExUnitJSON.Formatter{
  modules: [map()],
  opts: keyword(),
  seed: non_neg_integer() | nil,
  start_time: integer() | nil,
  tests: [map()]
}

Formatter state accumulating test results during a test run

Functions

child_spec(init_arg)

Returns a specification to start this module under a supervisor.

See Supervisor.