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patch.spec.ts
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patch.spec.ts
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import * as fs from 'fs';
import * as path from 'path';
import {
extractTargetFilePathFromPatch,
patchString,
} from '../../src/lib/patch';
describe(patchString.name, () => {
it('can apply a patch using string', () => {
const fixtureFolder = path.join(
__dirname,
'../fixtures/patchable-file-lodash',
);
const patchFilePath = path.join(fixtureFolder, 'lodash.patch');
const patchContents = fs.readFileSync(patchFilePath, 'utf-8');
const targetFilePath = path.join(
fixtureFolder,
extractTargetFilePathFromPatch(patchContents),
);
const contentsToPatch = fs.readFileSync(targetFilePath, 'utf-8');
const patchedContents = patchString(patchContents, contentsToPatch);
const expectedPatchedContentsFilePath = path.join(
fixtureFolder,
'lodash-expected-patched.js',
);
const expectedPatchedContents = fs.readFileSync(
expectedPatchedContentsFilePath,
'utf-8',
);
expect(patchedContents).toBe(expectedPatchedContents);
});
it('keeps the same line endings', () => {
const fixtureFolder = path.join(
__dirname,
'../fixtures/patchable-file-lodash',
);
const patchFilePath = path.join(fixtureFolder, 'lodash.patch');
const patchContents = fs.readFileSync(patchFilePath, 'utf-8');
const targetFilePath = path.join(
fixtureFolder,
extractTargetFilePathFromPatch(patchContents),
);
const contentsToPatch = fs
.readFileSync(targetFilePath, 'utf-8')
.split('\n')
.join('\r\n');
const patchedContents = patchString(patchContents, contentsToPatch);
const expectedPatchedContentsFilePath = path.join(
fixtureFolder,
'lodash-expected-patched.js',
);
const expectedPatchedContents = fs
.readFileSync(expectedPatchedContentsFilePath, 'utf-8')
.split('\n')
.join('\r\n');
expect(patchedContents).toBe(expectedPatchedContents);
});
// if the patch is not compatible with the target, make sure we throw an Error and do patch
it('will throw if patch does not match target', () => {
const fixtureFolder = path.join(
__dirname,
'../fixtures/non-patchable-file-because-non-matching',
);
const patchFilePath = path.join(fixtureFolder, 'lodash.patch');
const patchContents = fs.readFileSync(patchFilePath, 'utf-8');
const targetFilePath = path.join(
fixtureFolder,
extractTargetFilePathFromPatch(patchContents),
);
const contentsToPatch = fs.readFileSync(targetFilePath, 'utf-8');
expect(() => {
patchString(patchContents, contentsToPatch);
}).toThrow(Error);
});
});