Improve context for errors thrown by compiler
This commit introduces a custom error object to provide additional context for errors throwing during parsing and compiling operations, improving troubleshooting. By integrating error context handling, the error messages become more informative and user-friendly, providing sequence of trace with context to aid in troubleshooting. Changes include: - Introduce custom error object that extends errors with contextual information. This replaces previous usages of `AggregateError` which is not displayed well by browsers when logged. - Improve parsing functions to encapsulate error context with more details. - Increase unit test coverage and refactor the related code to be more testable.
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undergroundwires
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import { describe, it, expect } from 'vitest';
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import { CategoryDataStub } from '@tests/unit/shared/Stubs/CategoryDataStub';
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import type { NodeData } from '@/application/Parser/NodeValidation/NodeData';
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import { createNodeDataErrorContextStub } from '@tests/unit/shared/Stubs/NodeDataErrorContextStub';
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import type { NodeDataErrorContext } from '@/application/Parser/NodeValidation/NodeDataErrorContext';
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import { collectExceptionMessage } from '@tests/unit/shared/ExceptionCollector';
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import { ContextualNodeDataValidator, createNodeDataValidator, type NodeDataValidator } from '@/application/Parser/NodeValidation/NodeDataValidator';
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import type { NodeContextErrorMessageCreator } from '@/application/Parser/NodeValidation/NodeDataErrorContextMessage';
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import { getAbsentObjectTestCases, getAbsentStringTestCases } from '@tests/unit/shared/TestCases/AbsentTests';
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describe('createNodeDataValidator', () => {
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it(`returns an instance of ${ContextualNodeDataValidator.name}`, () => {
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// arrange
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const context = createNodeDataErrorContextStub();
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// act
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const validator = createNodeDataValidator(context);
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// assert
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expect(validator).to.be.instanceOf(ContextualNodeDataValidator);
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});
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});
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describe('NodeDataValidator', () => {
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describe('assertValidName', () => {
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describe('throws when name is invalid', () => {
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// arrange
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const testScenarios: readonly {
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readonly description: string;
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readonly invalidName: unknown;
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readonly expectedMessage: string;
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}[] = [
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...getAbsentStringTestCases().map((testCase) => ({
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description: `missing name (${testCase.valueName})`,
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invalidName: testCase.absentValue,
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expectedMessage: 'missing name',
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})),
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{
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description: 'invalid type',
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invalidName: 33,
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expectedMessage: 'Name (33) is not a string but number.',
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},
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];
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testScenarios.forEach(({ description, invalidName, expectedMessage }) => {
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describe(`given "${description}"`, () => {
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itThrowsCorrectly({
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// act
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throwingAction: (sut) => {
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sut.assertValidName(invalidName as string);
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},
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// assert
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expectedMessage,
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});
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});
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});
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});
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it('does not throw when name is valid', () => {
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// arrange
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const validName = 'validName';
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const sut = new NodeValidatorBuilder()
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.build();
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// act
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const act = () => sut.assertValidName(validName);
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// assert
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expect(act).to.not.throw();
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});
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});
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describe('assertDefined', () => {
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describe('throws when node data is missing', () => {
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// arrange
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const testScenarios: readonly {
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readonly description: string;
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readonly invalidData: unknown;
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}[] = [
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...getAbsentObjectTestCases().map((testCase) => ({
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description: `absent object (${testCase.valueName})`,
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invalidData: testCase.absentValue,
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})),
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{
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description: 'empty object',
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invalidData: {},
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},
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];
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testScenarios.forEach(({ description, invalidData }) => {
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describe(`given "${description}"`, () => {
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const expectedMessage = 'missing node data';
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itThrowsCorrectly({
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// act
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throwingAction: (sut: NodeDataValidator) => {
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sut.assertDefined(invalidData as NodeData);
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},
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// assert
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expectedMessage,
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});
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});
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});
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});
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it('does not throw if node data is defined', () => {
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// arrange
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const definedNode = new CategoryDataStub();
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const sut = new NodeValidatorBuilder()
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.build();
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// act
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const act = () => sut.assertDefined(definedNode);
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// assert
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expect(act).to.not.throw();
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});
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});
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describe('assert', () => {
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describe('throws if validation fails', () => {
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const falsePredicate = () => false;
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const expectedErrorMessage = 'expected error';
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// assert
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itThrowsCorrectly({
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// act
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throwingAction: (sut: NodeDataValidator) => {
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sut.assert(falsePredicate, expectedErrorMessage);
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},
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// assert
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expectedMessage: expectedErrorMessage,
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});
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});
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it('does not throw if validation succeeds', () => {
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// arrange
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const truePredicate = () => true;
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const sut = new NodeValidatorBuilder()
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.build();
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// act
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const act = () => sut.assert(truePredicate, 'ignored error');
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// assert
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expect(act).to.not.throw();
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});
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});
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describe('createContextualErrorMessage', () => {
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it('creates using the correct error message', () => {
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// arrange
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const expectedErrorMessage = 'expected error';
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const errorMessageBuilder: NodeContextErrorMessageCreator = (message) => message;
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const sut = new NodeValidatorBuilder()
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.withErrorMessageCreator(errorMessageBuilder)
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.build();
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// act
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const actualErrorMessage = sut.createContextualErrorMessage(expectedErrorMessage);
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// assert
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expect(actualErrorMessage).to.equal(expectedErrorMessage);
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});
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it('creates using the correct context', () => {
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// arrange
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const expectedContext = createNodeDataErrorContextStub();
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let actualContext: NodeDataErrorContext | undefined;
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const errorMessageBuilder: NodeContextErrorMessageCreator = (_, context) => {
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actualContext = context;
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return '';
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};
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const sut = new NodeValidatorBuilder()
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.withContext(expectedContext)
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.withErrorMessageCreator(errorMessageBuilder)
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.build();
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// act
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sut.createContextualErrorMessage('unimportant');
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// assert
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expect(actualContext).to.equal(expectedContext);
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});
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});
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});
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type ValidationThrowingFunction = (
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sut: ContextualNodeDataValidator,
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) => void;
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interface ValidationThrowingTestScenario {
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readonly throwingAction: ValidationThrowingFunction,
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readonly expectedMessage: string;
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}
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function itThrowsCorrectly(
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testScenario: ValidationThrowingTestScenario,
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): void {
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it('throws an error', () => {
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// arrange
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const expectedErrorMessage = 'Injected error message';
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const errorMessageBuilder: NodeContextErrorMessageCreator = () => expectedErrorMessage;
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const sut = new NodeValidatorBuilder()
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.withErrorMessageCreator(errorMessageBuilder)
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.build();
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// act
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const action = () => testScenario.throwingAction(sut);
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// assert
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expect(action).to.throw();
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});
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it('throws with the correct error message', () => {
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// arrange
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const expectedErrorMessage = testScenario.expectedMessage;
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const errorMessageBuilder: NodeContextErrorMessageCreator = (message) => message;
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const sut = new NodeValidatorBuilder()
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.withErrorMessageCreator(errorMessageBuilder)
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.build();
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// act
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const action = () => testScenario.throwingAction(sut);
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// assert
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const actualErrorMessage = collectExceptionMessage(action);
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expect(actualErrorMessage).to.equal(expectedErrorMessage);
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});
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it('throws with the correct context', () => {
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// arrange
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const expectedContext = createNodeDataErrorContextStub();
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const serializeContext = (context: NodeDataErrorContext) => JSON.stringify(context);
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const errorMessageBuilder:
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NodeContextErrorMessageCreator = (_, context) => serializeContext(context);
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const sut = new NodeValidatorBuilder()
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.withContext(expectedContext)
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.withErrorMessageCreator(errorMessageBuilder)
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.build();
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// act
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const action = () => testScenario.throwingAction(sut);
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// assert
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const expectedSerializedContext = serializeContext(expectedContext);
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const actualSerializedContext = collectExceptionMessage(action);
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expect(expectedSerializedContext).to.equal(actualSerializedContext);
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});
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}
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class NodeValidatorBuilder {
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private errorContext: NodeDataErrorContext = createNodeDataErrorContextStub();
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private errorMessageCreator: NodeContextErrorMessageCreator = () => `[${NodeValidatorBuilder.name}] stub error message`;
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public withErrorMessageCreator(errorMessageCreator: NodeContextErrorMessageCreator): this {
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this.errorMessageCreator = errorMessageCreator;
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return this;
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}
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public withContext(errorContext: NodeDataErrorContext): this {
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this.errorContext = errorContext;
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return this;
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}
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public build(): ContextualNodeDataValidator {
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return new ContextualNodeDataValidator(
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this.errorContext,
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this.errorMessageCreator,
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);
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}
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}
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