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

frontend/lib/build-generate-video-body.test.ts

@@ -0,0 +1,72 @@
+import assert from 'node:assert/strict'
+import { describe, it } from 'node:test'
+import { DEFAULT_KEYFRAME_STRENGTH, type KeyframeItem } from './multi-keyframe.ts'
+import { buildGenerateVideoImageInputs } from './build-generate-video-body.ts'
+
+const keyframes: KeyframeItem[] = [
+  { id: 'opening', path: '/frames/opening.png', frameIndex: 0, strength: DEFAULT_KEYFRAME_STRENGTH },
+  { id: 'ending', path: '/frames/ending.png', frameIndex: 121, strength: DEFAULT_KEYFRAME_STRENGTH },
+]
+
+describe('buildGenerateVideoImageInputs', () => {
+  it('maps multi-keyframes to the backend request shape', () => {
+    assert.deepEqual(
+      buildGenerateVideoImageInputs({
+        mode: 'multi-keyframe',
+        imagePath: null,
+        lastImagePath: null,
+        keyframes,
+      }),
+      {
+        keyframes: [
+          { imagePath: '/frames/opening.png', frameIndex: 0, strength: DEFAULT_KEYFRAME_STRENGTH },
+          { imagePath: '/frames/ending.png', frameIndex: 121, strength: DEFAULT_KEYFRAME_STRENGTH },
+        ],
+      },
+    )
+  })
+
+  it('omits image inputs when multi-keyframes are present', () => {
+    const result = buildGenerateVideoImageInputs({
+      mode: 'multi-keyframe',
+      imagePath: '/frames/first.png',
+      lastImagePath: '/frames/last.png',
+      keyframes,
+    })
+
+    assert.equal('imagePath' in result, false)
+    assert.equal('lastImagePath' in result, false)
+    assert.equal('keyframes' in result, true)
+  })
+
+  it('forwards each still\'s owned strength on generate', () => {
+    assert.deepEqual(
+      buildGenerateVideoImageInputs({
+        mode: 'multi-keyframe',
+        imagePath: null,
+        lastImagePath: null,
+        keyframes: [
+          { id: 'opening', path: '/frames/opening.png', frameIndex: 0, strength: 0.7 },
+        ],
+      }),
+      {
+        keyframes: [{ imagePath: '/frames/opening.png', frameIndex: 0, strength: 0.7 }],
+      },
+    )
+  })
+
+  it('preserves image inputs outside multi-keyframe mode', () => {
+    assert.deepEqual(
+      buildGenerateVideoImageInputs({
+        mode: 'video',
+        imagePath: '/frames/first.png',
+        lastImagePath: '/frames/last.png',
+        keyframes,
+      }),
+      {
+        imagePath: '/frames/first.png',
+        lastImagePath: '/frames/last.png',
+      },
+    )
+  })
+})