ability to generate the HTML data and .last_run.json files only

[cppgent0]

This is an enhancement request, not a bug/issue

I currently have different types of test runs (eg. unit tests and automated system tests).

Note these are separate processes (not run in parallel).

It would be ideal if I could:

• run each of these separately
• gather the contents of .last_run.json and save if off separately
• have no report data printed. (see output_message in simplecov-html)

And then at the end of all the runs:

• run a script to generate all of the HTML
• generate a report of all the totals from the contents I've gathered from .last_run.json

[sferik]

This should all be possible in the next release of SimpleCov now that we've simplified the architecture and added a CLI. Every run writes a structured coverage.json alongside the existing .resultset.json and the HTML report is rendered client-side from that JSON, so you can drive each piece of your workflow independently.

For your unit and system suites, set a distinct command_name and use the JSON formatter in silent mode, so nothing prints but the data files will still land in coverage/:

SimpleCov.command_name ENV.fetch("SUITE")
SimpleCov.formatters = [SimpleCov::Formatter::JSONFormatter.new(silent: true)]
SimpleCov.start

Then, once both suites have run, stitch them together with simplecov merge:

simplecov merge coverage/unit/.resultset.json coverage/system/.resultset.json

From there, simplecov report prints the combined totals, and HTMLFormatter#format_from_json (or just re-running with the HTML formatter against the merged resultset) regenerates the full HTML report without re-running the tests.

I’m going to close this issue but please feel free to reopen it (or open a new one) if it doesn’t actually solve your problem.