Compact diagnostics for mutants that ended as :harness_error.
The runner already captures the raw mix test output, but the final reports
need a short, stable summary rather than an entire suite log. This module is the
shared presentation layer for human, JSON, live, and abort messages.
This module formats the diagnostic. Mutare.Sandbox.Command.Output parses
Mix's output: salient_line/1 selects the line to show, and boot_failure?/1
identifies the known boot crash.
Summary
Functions
Return a site-prefixed diagnostic line suitable for multi-error summaries.
Return a one-line diagnostic for a harness-errored result.
Functions
@spec line(Mutare.Result.t()) :: String.t()
Return a site-prefixed diagnostic line suitable for multi-error summaries.
@spec summary(Mutare.Result.t()) :: String.t()
Return a one-line diagnostic for a harness-errored result.
Includes the exit status when known plus the output's salient line
(Mutare.Sandbox.Command.Output.salient_line/1), truncated. The known
self-erasing boot crash gets a cause-specific summary because its output is
explicitly not useful for recovering the original exception.