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import { describe, expect, test } from "bun:test";
import type { ElementAnimations } from "@/types/animation";
import {
clampAnimationsToDuration,
getElementKeyframes,
getKeyframeAtTime,
hasKeyframesForPath,
getChannelValueAtTime,
getElementLocalTime,
resolveTransformAtTime,
splitAnimationsAtTime,
} from "@/lib/animation";
describe("transform keyframe evaluation", () => {
test("uses fallback value when channel is missing", () => {
const value = getChannelValueAtTime({
channel: undefined,
time: 1,
fallbackValue: 42,
});
expect(value).toBe(42);
});
test("returns boundary value when time is within epsilon of first/last keyframe", () => {
const channel = {
valueKind: "number" as const,
keyframes: [
{ id: "a", time: 0, value: 10, interpolation: "linear" as const },
{ id: "b", time: 2, value: 30, interpolation: "linear" as const },
],
};
expect(
getChannelValueAtTime({
channel,
time: 0.0008,
fallbackValue: 0,
}),
).toBe(10);
expect(
getChannelValueAtTime({
channel,
time: 1.9992,
fallbackValue: 0,
}),
).toBe(30);
});
test("interpolates linear channels", () => {
const value = getChannelValueAtTime({
channel: {
valueKind: "number",
keyframes: [
{ id: "a", time: 0, value: 10, interpolation: "linear" },
{ id: "b", time: 2, value: 30, interpolation: "linear" },
],
},
time: 1,
fallbackValue: 0,
});
expect(value).toBe(20);
});
test("clamps local time to [0, duration]", () => {
expect(
getElementLocalTime({
timelineTime: 2,
elementStartTime: 5,
elementDuration: 4,
}),
).toBe(0);
expect(
getElementLocalTime({
timelineTime: 12,
elementStartTime: 5,
elementDuration: 4,
}),
).toBe(4);
expect(
getElementLocalTime({
timelineTime: 7,
elementStartTime: 5,
elementDuration: 4,
}),
).toBe(2);
});
test("uses hold interpolation from the left keyframe", () => {
const value = getChannelValueAtTime({
channel: {
valueKind: "number",
keyframes: [
{ id: "a", time: 0, value: 10, interpolation: "hold" },
{ id: "b", time: 2, value: 30, interpolation: "linear" },
],
},
time: 1,
fallbackValue: 0,
});
expect(value).toBe(10);
});
test("resolves transform by mixing animated and fallback properties", () => {
const animations: ElementAnimations = {
channels: {
"transform.position.x": {
valueKind: "number",
keyframes: [
{ id: "a", time: 0, value: 0, interpolation: "linear" },
{ id: "b", time: 4, value: 80, interpolation: "linear" },
],
},
"transform.scale": {
valueKind: "number",
keyframes: [{ id: "c", time: 0, value: 2, interpolation: "hold" }],
},
},
};
const resolvedTransform = resolveTransformAtTime({
baseTransform: {
position: { x: 10, y: 20 },
scale: 1,
rotate: 15,
},
animations,
localTime: 2,
});
expect(resolvedTransform).toEqual({
position: { x: 40, y: 20 },
scale: 2,
rotate: 15,
});
});
});
describe("transform keyframe mutation utilities", () => {
test("splits channels and rebases right side times", () => {
const animations: ElementAnimations = {
channels: {
"transform.scale": {
valueKind: "number",
keyframes: [
{ id: "a", time: 0, value: 1, interpolation: "linear" },
{ id: "b", time: 2, value: 2, interpolation: "linear" },
{ id: "c", time: 6, value: 4, interpolation: "linear" },
],
},
},
};
const { leftAnimations, rightAnimations } = splitAnimationsAtTime({
animations,
splitTime: 4,
});
expect(
leftAnimations?.channels["transform.scale"]?.keyframes.map(
(keyframe) => keyframe.time,
),
).toEqual([0, 2, 4]);
expect(
rightAnimations?.channels["transform.scale"]?.keyframes.map(
(keyframe) => keyframe.time,
),
).toEqual([0, 2]);
expect(
rightAnimations?.channels["transform.scale"]?.keyframes[0]?.value,
).toBe(3);
});
test("clamps channels to updated element duration", () => {
const animations: ElementAnimations = {
channels: {
"transform.rotate": {
valueKind: "number",
keyframes: [
{ id: "a", time: 0, value: 0, interpolation: "linear" },
{ id: "b", time: 2, value: 20, interpolation: "linear" },
{ id: "c", time: 5, value: 50, interpolation: "linear" },
],
},
},
};
const clampedAnimations = clampAnimationsToDuration({
animations,
duration: 2,
});
expect(
clampedAnimations?.channels["transform.rotate"]?.keyframes.map(
(keyframe) => keyframe.time,
),
).toEqual([0, 2]);
});
});
describe("typed channel interpolation", () => {
test("interpolates color channels from hex keyframes", () => {
const value = getChannelValueAtTime({
channel: {
valueKind: "color",
keyframes: [
{ id: "a", time: 0, value: "#000000", interpolation: "linear" },
{ id: "b", time: 1, value: "#ffffff", interpolation: "linear" },
],
},
time: 0.5,
fallbackValue: "#000000",
});
expect(typeof value).toBe("string");
expect(value).toContain("rgba(");
});
test("uses hold behavior for discrete channels", () => {
const value = getChannelValueAtTime({
channel: {
valueKind: "discrete",
keyframes: [
{ id: "a", time: 0, value: "normal", interpolation: "hold" },
{ id: "b", time: 2, value: "multiply", interpolation: "hold" },
],
},
time: 1.2,
fallbackValue: "normal",
});
expect(value).toBe("normal");
});
});
describe("keyframe query helpers", () => {
test("getElementKeyframes returns flat list of all keyframes across channels", () => {
const animations: ElementAnimations = {
channels: {
"transform.position.x": {
valueKind: "number",
keyframes: [{ id: "x-1", time: 1, value: 64, interpolation: "linear" }],
},
opacity: {
valueKind: "number",
keyframes: [{ id: "o-1", time: 0, value: 1, interpolation: "linear" }],
},
},
};
const keyframes = getElementKeyframes({ animations });
expect(keyframes).toHaveLength(2);
expect(keyframes.map((keyframe) => keyframe.propertyPath).sort()).toEqual([
"opacity",
"transform.position.x",
]);
});
test("getElementKeyframes returns empty array when animations are missing or channels are empty", () => {
expect(getElementKeyframes({ animations: undefined })).toEqual([]);
expect(
getElementKeyframes({
animations: {
channels: { opacity: { valueKind: "number", keyframes: [] } },
},
}),
).toEqual([]);
});
test("hasKeyframesForPath returns true only for paths with keyframes", () => {
const animations: ElementAnimations = {
channels: {
"transform.position.x": {
valueKind: "number",
keyframes: [{ id: "x-1", time: 1, value: 64, interpolation: "linear" }],
},
"transform.position.y": {
valueKind: "number",
keyframes: [],
},
},
};
expect(
hasKeyframesForPath({ animations, propertyPath: "transform.position.x" }),
).toBe(true);
expect(
hasKeyframesForPath({ animations, propertyPath: "transform.position.y" }),
).toBe(false);
});
test("getKeyframeAtTime finds keyframe within epsilon and returns full object", () => {
const animations: ElementAnimations = {
channels: {
"transform.rotate": {
valueKind: "number",
keyframes: [
{ id: "r-1", time: 1, value: 15, interpolation: "linear" },
{ id: "r-2", time: 2, value: 30, interpolation: "linear" },
],
},
},
};
const found = getKeyframeAtTime({
animations,
propertyPath: "transform.rotate",
time: 1.0008,
});
expect(found?.id).toBe("r-1");
expect(found?.value).toBe(15);
expect(found?.propertyPath).toBe("transform.rotate");
expect(
getKeyframeAtTime({
animations,
propertyPath: "transform.rotate",
time: 1.01,
}),
).toBeNull();
});
});
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