Create standalone browser port of LTX Athena with authenticated native API transport

frontend/lib/keyframe-controls.test.ts

@@ -0,0 +1,53 @@
+import assert from 'node:assert/strict'
+import { describe, it } from 'node:test'
+import { applyTimecode, nudgeKeyframe } from './keyframe-controls.ts'
+
+const keyframes = [
+  { id: 'opening', frameIndex: 10 },
+  { id: 'middle', frameIndex: 11 },
+  { id: 'closing', frameIndex: 20 },
+]
+
+describe('nudgeKeyframe', () => {
+  it('moves a keyframe one frame in the requested direction', () => {
+    assert.equal(nudgeKeyframe(keyframes, 'closing', -1, 30), 19)
+  })
+
+  it('never lands on another keyframe', () => {
+    const frameIndex = nudgeKeyframe(keyframes, 'opening', 1, 30)
+
+    assert.equal(frameIndex, 12)
+    assert.equal(
+      keyframes.some((keyframe) => (
+        keyframe.id !== 'opening' && keyframe.frameIndex === frameIndex
+      )),
+      false,
+    )
+  })
+
+  it('returns null for an unknown keyframe', () => {
+    assert.equal(nudgeKeyframe(keyframes, 'missing', 1, 30), null)
+  })
+})
+
+describe('applyTimecode', () => {
+  it('converts a valid timecode to a frame index', () => {
+    assert.equal(applyTimecode(keyframes, 'opening', '00:00.13', 25, 30), 13)
+  })
+
+  it('moves a colliding timecode to the nearest free frame', () => {
+    const frameIndex = applyTimecode(keyframes, 'opening', '00:00.11', 25, 30)
+
+    assert.equal(frameIndex, 12)
+    assert.equal(
+      keyframes.some((keyframe) => (
+        keyframe.id !== 'opening' && keyframe.frameIndex === frameIndex
+      )),
+      false,
+    )
+  })
+
+  it('returns null for invalid timecode', () => {
+    assert.equal(applyTimecode(keyframes, 'opening', 'invalid', 25, 30), null)
+  })
+})