test: add basic tests for run & main.R

[kelly-sovacool]

Changes

adds basic tests for use in CI

Issues

NA

PR Checklist

(Strikethrough any points that are not applicable.)

• This comment contains a description of changes with justifications, with any relevant issues linked.
• Run the capsule in Code Ocean and ensure it completes successfully with no errors.
• [ ] Update CHANGELOG.md with a short description of any user-facing changes and reference the PR number. Follow the style described in https://style.tidyverse.org/news.html
• The tests workflow succeeds on the latest commit.

[Copilot]

Pull request overview

Adds a basic CI test harness to validate that the capsule entrypoints (code/main.R and code/run) execute successfully and generate the expected expression heatmap output.

Changes:

• Add testthat tests that run Rscript main.R and bash run ... in an isolated temp workspace and assert the heatmap PNG is produced.
• Add CLI/test helpers to stage fixture data + patch main.R to load the in-repo MOSuite checkout during tests.
• Add a GitHub Actions workflow that runs tests inside the capsule’s Docker base image and expose status via a README badge.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/testthat/test-main.R	End-to-end tests invoking main.R and run, asserting plot output exists.
tests/testthat/helper-cli.R	Helper utilities to set up a temp workspace, copy fixtures, and validate plot output.
tests/testthat.R	Test runner script for CI (Rscript tests/testthat.R).
tests/test-setup.R	Standalone diagnostic script for verifying paths/fixtures.
README.md	Adds GitHub Actions “tests” status badge.
.github/workflows/tests.yml	CI workflow to run the test runner inside the capsule Docker image.

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