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plugin.test.js
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plugin.test.js
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const path = require('path');
const mockCompiler = jest.fn().mockImplementation((code) => ({js: {code}}));
const mockPreprocessor = jest.fn().mockImplementation((code) => code);
jest.mock('svelte/compiler', () => ({compile: mockCompiler, preprocess: mockPreprocessor})); // important: mock before import
const plugin = require('../plugin');
let DEFAULT_CONFIG;
const mockComponent = path.join(__dirname, 'Button.svelte');
describe('@snowpack/plugin-svelte (mocked)', () => {
beforeEach(() => {
DEFAULT_CONFIG = {
buildOptions: {sourcemap: false},
packageOptions: {
source: 'local',
packageLookupFields: [],
},
};
});
afterEach(() => {
mockCompiler.mockClear();
mockPreprocessor.mockClear();
});
it('logs error if config options set but finds no file', async () => {
expect(() => {
plugin(DEFAULT_CONFIG, {
configFilePath: './plugins/plugin-svelte/this-file-does-not-exist.js',
});
}).toThrow(/failed to find Svelte config file/);
});
it('logs error if compileOptions is used instead of compilerOptions', async () => {
expect(() => {
plugin(DEFAULT_CONFIG, {
compileOptions: {__test: 'ignore'},
});
}).toThrow(
`[plugin-svelte] Could not recognize "compileOptions". Did you mean "compilerOptions"?`,
);
});
it('logs error if old style config format is used', async () => {
const badOptionCheck = /Svelte\.compile options moved to new config value/;
expect(() =>
plugin(DEFAULT_CONFIG, {
css: false,
}),
).toThrow(badOptionCheck);
expect(() =>
plugin(DEFAULT_CONFIG, {
generate: 'dom',
}),
).toThrow(badOptionCheck);
});
it('logs error if resolve input is invalid', async () => {
expect(() => {
plugin(DEFAULT_CONFIG, {
input: '.svelte',
});
}).toThrow(`[plugin-svelte] Option "input" must be an array (e.g. ['.svelte', '.svx'])`);
expect(() => {
plugin(DEFAULT_CONFIG, {
input: [],
});
}).toThrow(`[plugin-svelte] Option "input" must specify at least one filetype`);
});
it('passes compilerOptions to compiler', async () => {
const compilerOptions = {
__test: 'compilerOptions',
};
const sveltePlugin = plugin(DEFAULT_CONFIG, {compilerOptions});
await sveltePlugin.load({filePath: mockComponent});
expect(mockCompiler.mock.calls[0][1]).toEqual({
__test: 'compilerOptions',
css: false,
dev: true,
filename: mockComponent,
generate: 'dom',
outputFilename: mockComponent,
});
});
it('passes preprocess options to compiler', async () => {
const preprocess = {__test: 'preprocess'};
const sveltePlugin = plugin(DEFAULT_CONFIG, {preprocess});
await sveltePlugin.load({filePath: mockComponent});
expect(mockPreprocessor.mock.calls[0][1]).toEqual(preprocess);
});
// For our users we load from the current working directory, but in jest that doesn't make sense
it.skip('load config from a default svelte config file', async () => {
const sveltePlugin = plugin(DEFAULT_CONFIG, {});
await sveltePlugin.load({filePath: mockComponent});
expect(mockCompiler.mock.calls[0][1]).toEqual({__test: 'svelte.config.js'});
expect(mockPreprocessor.mock.calls[0][1]).toEqual({__test: 'svelte.config.js::preprocess'});
});
it('load config from a custom svelte config file', async () => {
const sveltePlugin = plugin(DEFAULT_CONFIG, {
configFilePath: './plugins/plugin-svelte/test/custom-config.js',
});
await sveltePlugin.load({filePath: mockComponent});
expect(mockCompiler.mock.calls[0][1]).toEqual({
__test: 'custom-config.js',
css: false,
dev: true,
filename: mockComponent,
generate: 'dom',
outputFilename: mockComponent,
});
expect(mockPreprocessor.mock.calls[0][1]).toEqual({__test: 'custom-config.js::preprocess'});
});
it('resolves custom file extensions', async () => {
expect(
plugin(DEFAULT_CONFIG, {
input: ['.svelte', '.svx'],
}).resolve.input,
).toMatchInlineSnapshot(`
Array [
".svelte",
".svx",
]
`);
expect(
plugin(DEFAULT_CONFIG, {
input: ['.svx'],
}).resolve.input,
).toMatchInlineSnapshot(`
Array [
".svx",
]
`);
});
it('supports importing svelte components', async () => {
const config = {...DEFAULT_CONFIG};
plugin(config, {});
expect(config.packageOptions.packageLookupFields).toEqual(['svelte']);
config.packageOptions.packageLookupFields = ['module'];
plugin(config, {});
expect(config.packageOptions.packageLookupFields).toEqual(['module', 'svelte']);
});
});