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test.js
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test.js
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import test from 'ava';
import defaults from './index.js';
test('options is an object', t => {
const options = defaults(false, {a: true});
t.true(options.a);
});
test('ensure defaults override non-existent keys', t => {
const result = defaults({}, {a: false, b: true});
t.true(result.b, 'b merges over undefined');
t.false(result.a, 'a merges over undefined');
});
test('undefined options', t => {
t.deepEqual(defaults(undefined, {a: false}), {a: false});
});
test('undefined default options', t => {
t.deepEqual(defaults({a: false}, undefined), {a: false});
});
test('undefined options and default options', t => {
t.deepEqual(defaults(), {});
});
test('ensure defined keys are not overwritten', t => {
const result = defaults({b: false}, {a: false, b: true});
t.false(result.b, 'b not merged');
t.false(result.a, 'a merges over undefined');
});
test('ensure deep merging of plain objects', t => {
const options = {a: {b: 1}};
const defaultOptions = {a: {c: 2}};
const result = defaults(options, defaultOptions);
t.deepEqual(result, {a: {b: 1, c: 2}});
});
test('ensure arrays are not merged', t => {
const options = {a: [1, 2, 3]};
const defaultOptions = {a: [4, 5]};
const result = defaults(options, defaultOptions);
t.deepEqual(result, {a: [1, 2, 3]});
});
test('ensure correct handling of null and undefined values', t => {
const options = {a: null, b: undefined};
const defaultOptions = {a: {c: 1}, b: {d: 2}};
const result = defaults(options, defaultOptions);
t.deepEqual(result, {a: null, b: {d: 2}});
});
test('ensure the given `defaultOptions` is not modified', t => {
const fixture = {
a: {
b: 'c',
},
};
const defaultOptions = structuredClone(fixture);
defaults({a: {b: 'd'}}, defaultOptions);
t.deepEqual(defaultOptions, fixture);
});
test('ensure the given `options` is not modified', t => {
const fixture = {
a: {
b: 'c',
},
};
const options = structuredClone(fixture);
defaults(options, {a: {b: 'd'}});
t.deepEqual(options, fixture);
});