/
no-large-snapshots.test.js
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/
no-large-snapshots.test.js
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'use strict';
const noLargeSnapshots = require('../no-large-snapshots').create;
// was not able to use https://eslint.org/docs/developer-guide/nodejs-api#ruletester for these because there is no way to configure RuleTester to run non .js files
describe('no-large-snapshots', () => {
it('should return an empty object for non snapshot files', () => {
const mockContext = {
getFilename: () => 'mock-component.jsx',
options: [],
};
const result = noLargeSnapshots(mockContext);
expect(result).toEqual({});
});
it('should return an object with an ExpressionStatement function for snapshot files', () => {
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [],
};
const result = noLargeSnapshots(mockContext);
expect(result).toMatchObject({
ExpressionStatement: expect.any(Function),
});
});
describe('ExpressionStatement function', () => {
it('should report if node has more than 50 lines of code and no sizeThreshold option is passed', () => {
const mockReport = jest.fn();
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [],
report: mockReport,
};
const mockNode = {
loc: {
start: {
line: 1,
},
end: {
line: 53,
},
},
};
noLargeSnapshots(mockContext).ExpressionStatement(mockNode);
expect(mockReport).toHaveBeenCalledTimes(1);
expect(mockReport.mock.calls[0]).toMatchSnapshot();
});
it('should report if node has more lines of code than number given in sizeThreshold option', () => {
const mockReport = jest.fn();
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [{ maxSize: 70 }],
report: mockReport,
};
const mockNode = {
loc: {
start: {
line: 20,
},
end: {
line: 103,
},
},
};
noLargeSnapshots(mockContext).ExpressionStatement(mockNode);
expect(mockReport).toHaveBeenCalledTimes(1);
expect(mockReport.mock.calls[0]).toMatchSnapshot();
});
it('should report if maxSize is zero', () => {
const mockReport = jest.fn();
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [{ maxSize: 0 }],
report: mockReport,
};
const mockNode = {
loc: {
start: {
line: 1,
},
end: {
line: 2,
},
},
};
noLargeSnapshots(mockContext).ExpressionStatement(mockNode);
expect(mockReport).toHaveBeenCalledTimes(1);
expect(mockReport.mock.calls[0]).toMatchSnapshot();
});
it('should not report if node has fewer lines of code than limit', () => {
const mockReport = jest.fn();
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [],
report: mockReport,
};
const mockNode = {
loc: {
start: {
line: 1,
},
end: {
line: 18,
},
},
};
noLargeSnapshots(mockContext).ExpressionStatement(mockNode);
expect(mockReport).not.toHaveBeenCalled();
});
});
});