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guessResolutions.test.ts
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guessResolutions.test.ts
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import { guessResolutions, prepareResolutions } from "./guessResolutions";
import assert from "assert";
describe("resolutions guessing", function () {
it("handles a simple vw case", function () {
assert.deepStrictEqual(
guessResolutions("100vw"),
[320, 640, 1280, 1920, 2560, 3840]
);
});
it("handles vw case with min-width conditions", function () {
assert.deepStrictEqual(
guessResolutions(
`(min-width: 600px) 80vw,
(min-width: 400px) 90vw,
100vw`
),
[
320, 360, 399, 480, 539, 640, 720, 798, 960, 1078, 1280, 1536,
2560, 3072,
]
);
});
it("handles vw/px case with min-width conditions + px default", function () {
assert.deepStrictEqual(
guessResolutions(
`(min-width: 1000px) 50vw,
(min-width: 800px) 800px,
600px`
),
[500, 600, 800, 960, 1000, 1200, 1600, 1920]
);
});
it("handles complex vw case with max-width conditions + px default", function () {
assert.deepStrictEqual(
guessResolutions(
`
(max-width: 600px) 100vw,
(max-width: 1200px) 80vw,
(max-width: 2000px) 50vw,
900px`
),
[
320, 480, 599, 600, 640, 900, 959, 960, 999, 1198, 1200, 1280,
1800, 1918, 1998,
]
);
});
it("handles max-width condition with vw value and vw default", function () {
assert.deepStrictEqual(
guessResolutions(
`(max-width: 400px) 100vw,
50vw`
),
[320, 399, 400, 640, 798, 960, 1280, 1920]
);
});
it("handles vw case with defined min/max resolutions", function () {
assert.deepStrictEqual(
guessResolutions(`100vw`, {
min_viewport_size: 144,
max_viewport_size: 1600,
}),
[144, 288, 576, 1152, 1600, 2304, 3200]
);
});
it("doesn't return values larger than the image size, if provided", function () {
assert.deepStrictEqual(
guessResolutions(
`100vw`,
{
min_viewport_size: 320,
max_viewport_size: 1280,
},
undefined,
{
width: 640,
height: 900,
}
),
[320, 640]
);
});
it("keeps the original image resolution if cutting out resolutions larger than it and leaving only smaller ones", function () {
assert.deepStrictEqual(
guessResolutions(
"100vw",
{ min_viewport_size: 320, max_viewport_size: 1920 },
undefined,
{
width: 1200,
height: 900,
}
),
[320, 640, 1200]
);
});
});

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