test: sample fixture course

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

fixtures/courses/sample/MENTOR.md

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+You are the mentor for the sample course. Give hints, never full solutions.

fixtures/courses/sample/code/S01 - First steps/hello.sh

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+echo "hello from the sample course"

fixtures/courses/sample/exercises/add/solution.js

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+export function add(a, b) {
+  return a + b;
+}

fixtures/courses/sample/exercises/add/starter.js

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+export function add(a, b) {
+  return a - b;
+}

fixtures/courses/sample/exercises/add/tests.js

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+export const tests = [
+  { name: "adds 2 and 3", run: (mod, assert) => assert.equal(mod.add(2, 3), 5) },
+  { name: "adds -1 and 1", run: (mod, assert) => assert.equal(mod.add(-1, 1), 0) },
+];

fixtures/courses/sample/lessons/01-intro.md

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+# Introduction
+
+Welcome to the sample course. It exists so tests have something small to load.

fixtures/courses/sample/lessons/02-video.md

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+# Transcript
+
+A two-second test pattern plays. Nothing is said.

fixtures/courses/sample/lessons/03-code.md

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+# Code along
+
+Run the script in the section files:
+
+```sh
+sh hello.sh
+```

fixtures/courses/sample/lessons/04-exercise.md

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+# Adding numbers
+
+Functions take values and return values.
+
+## Exercises
+
+### Exercise 2.1 — `add`
+
+Implement `add(a, b)` so that it returns the sum of its arguments.
+
+## Hints
+
+<details><summary>Exercise 2.1 (add) — nudge</summary>
+
+Which operator combines two numbers?
+
+</details>
+
+<details><summary>Exercise 2.1 (add) — near-solution</summary>
+
+Return `a + b`.
+
+</details>

fixtures/courses/sample/stcourse.yaml

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+schema: 1
+id: sample
+title: Sample course
+pitch: A tiny self-contained course used by the test suite.
+visibility: public
+tracks:
+  - { id: js, label: JavaScript }
+mentor: MENTOR.md
+source: { kind: authored }
+decks:
+  - { id: d1, file: media/deck.pdf, attachTo: m1-video }
+modules:
+  - id: m1
+    title: First steps
+    code: { dir: "code/S01 - First steps", command: "sh hello.sh" }
+    lessons:
+      - { id: m1-intro, title: Introduction, type: text, file: lessons/01-intro.md }
+      - { id: m1-video, title: Watch the clip, type: video, file: media/clip.mp4, duration: 2, transcript: lessons/02-video.md }
+      - { id: m1-code, title: Code along, type: text, file: lessons/03-code.md }
+  - id: m2
+    title: Exercises
+    lessons:
+      - { id: m2-text, title: Adding numbers, type: text, file: lessons/04-exercise.md }
+      - id: m2-ex-add
+        title: "Exercise 2.1: add"
+        type: exercise
+        file: lessons/04-exercise.md
+        anchor: exercise-21--add
+        hints: { file: lessons/04-exercise.md, match: "Exercise 2.1 (add)" }
+        browser:
+          language: js
+          starter: exercises/add/starter.js
+          tests: exercises/add/tests.js
+          solution: exercises/add/solution.js
+        localCommand: "node --test"

scripts/make-fixtures.sh

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+#!/bin/sh
+# Regenerates the binary fixtures under fixtures/courses/sample/media.
+set -eu
+cd "$(dirname "$0")/../fixtures/courses/sample/media"
+/usr/bin/ffmpeg -y -loglevel error -f lavfi -i "testsrc=duration=2:size=160x90:rate=10" \
+  -pix_fmt yuv420p -c:v libx264 -crf 35 -preset veryslow -movflags +faststart clip.mp4
+/home/user/.venvs/pdf/bin/python -I - <<'PY'
+import pymupdf
+doc = pymupdf.open()
+for i, text in enumerate(["Sample deck: title", "Sample deck: middle", "Sample deck: end"], 1):
+    page = doc.new_page(width=480, height=270)
+    page.insert_text((40, 135), text, fontsize=24)
+doc.save("deck.pdf", garbage=4, deflate=True)
+PY