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test: improve tests for formatter and grammar (#544)
### Summary of Changes * Add tests for the idempotence of formatter * Clear documents between tests to avoid colliding URIs * Move test creation code to a separate file, so it can be tested * Bump dependencies * Various bug fixes --------- Co-authored-by: megalinter-bot <129584137+megalinter-bot@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| import { listTestResources, resolvePathRelativeToResources } from '../helpers/testResources'; | ||
| import path from 'path'; | ||
| import fs from 'fs'; | ||
| import { validationHelper } from 'langium/test'; | ||
| import { Diagnostic } from 'vscode-languageserver-types'; | ||
| import { createSafeDsServices } from '../../src/language-server/safe-ds-module'; | ||
| import { EmptyFileSystem } from 'langium'; | ||
|
|
||
| const services = createSafeDsServices(EmptyFileSystem).SafeDs; | ||
| const separator = '// -----------------------------------------------------------------------------'; | ||
|
|
||
| export const createFormatterTests = async (): Promise<FormatterTest[]> => { | ||
| const testCases = listTestResources('formatting').map(async (pathRelativeToResources): Promise<FormatterTest> => { | ||
| const absolutePath = resolvePathRelativeToResources(path.join('formatting', pathRelativeToResources)); | ||
| const program = fs.readFileSync(absolutePath).toString(); | ||
| const parts = program.split(separator); | ||
|
|
||
| // Must contain exactly one separator | ||
| if (parts.length !== 2) { | ||
| return { | ||
| testName: `INVALID TEST FILE [${pathRelativeToResources}]`, | ||
| originalCode: '', | ||
| expectedFormattedCode: '', | ||
| error: new SeparatorError(parts.length - 1), | ||
| }; | ||
| } | ||
|
|
||
| // Original code must not contain syntax errors | ||
| const originalCode = normalizeLineBreaks(parts[0]).trimEnd(); | ||
| const expectedFormattedCode = normalizeLineBreaks(parts[1]).trim(); | ||
|
|
||
| const validationResult = await validationHelper(services)(parts[0]); | ||
| const syntaxErrors = validationResult.diagnostics.filter( | ||
| (d) => d.severity === 1 && (d.code === 'lexing-error' || d.code === 'parsing-error'), | ||
| ); | ||
|
|
||
| if (syntaxErrors.length > 0) { | ||
| return { | ||
| testName: `INVALID TEST FILE [${pathRelativeToResources}]`, | ||
| originalCode, | ||
| expectedFormattedCode, | ||
| error: new SyntaxErrorsInOriginalCodeError(syntaxErrors), | ||
| }; | ||
| } | ||
|
|
||
| return { | ||
| testName: `${pathRelativeToResources} should be formatted correctly`, | ||
| originalCode, | ||
| expectedFormattedCode, | ||
| }; | ||
| }); | ||
|
|
||
| return Promise.all(testCases); | ||
| }; | ||
|
|
||
| const normalizeLineBreaks = (code: string): string => { | ||
| return code.replace(/\r\n?/gu, '\n'); | ||
| }; | ||
|
|
||
| interface FormatterTest { | ||
| testName: string; | ||
| originalCode: string; | ||
| expectedFormattedCode: string; | ||
| error?: Error; | ||
| } | ||
|
|
||
| class SeparatorError extends Error { | ||
| constructor(readonly number_of_separators: number) { | ||
| super(`Expected exactly one separator but found ${number_of_separators}.`); | ||
| } | ||
| } | ||
|
|
||
| class SyntaxErrorsInOriginalCodeError extends Error { | ||
| constructor(readonly syntaxErrors: Diagnostic[]) { | ||
| const syntaxErrorsAsString = syntaxErrors.map((e) => `- ${e.message}`).join(`\n`); | ||
|
|
||
| super(`Original code has syntax errors:\n${syntaxErrorsAsString}`); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,93 +1,42 @@ | ||
| import { createSafeDsServices } from '../../src/language-server/safe-ds-module'; | ||
| import { expectFormatting, validationHelper } from 'langium/test'; | ||
| import { clearDocuments, expectFormatting } from 'langium/test'; | ||
| import { describe, it } from 'vitest'; | ||
| import { EmptyFileSystem } from 'langium'; | ||
| import { listTestResources, resolvePathRelativeToResources } from '../helpers/testResources'; | ||
| import path from 'path'; | ||
| import fs from 'fs'; | ||
| import { Diagnostic } from 'vscode-languageserver-types'; | ||
| import { createFormatterTests } from './creator'; | ||
|
|
||
| const services = createSafeDsServices({ ...EmptyFileSystem }).SafeDs; | ||
| const separator = '// -----------------------------------------------------------------------------'; | ||
| const services = createSafeDsServices(EmptyFileSystem).SafeDs; | ||
| const formatterTests = createFormatterTests(); | ||
|
|
||
| describe('formatter', async () => { | ||
| it.each(await createFormatterTest())('$testName', async (test) => { | ||
| it.each(await formatterTests)('$testName', async (test) => { | ||
| // Test is invalid | ||
| if (test.error) { | ||
| throw test.error; | ||
| } | ||
|
|
||
| // Formatting original code must result in expected formatted code | ||
| await expectFormatting(services)({ | ||
| before: test.originalCode, | ||
| after: test.expectedFormattedCode, | ||
| }); | ||
| }); | ||
| }); | ||
|
|
||
| const createFormatterTest = async (): Promise<FormatterTest[]> => { | ||
| const testCases = listTestResources('formatting').map(async (pathRelativeToResources): Promise<FormatterTest> => { | ||
| const absolutePath = resolvePathRelativeToResources(path.join('formatting', pathRelativeToResources)); | ||
| const program = fs.readFileSync(absolutePath).toString(); | ||
| const parts = program.split(separator); | ||
| // Clear loaded documents to avoid colliding URIs (https://github.com/langium/langium/issues/1146) | ||
| await clearDocuments(services); | ||
| }); | ||
|
|
||
| // Must contain exactly one separator | ||
| if (parts.length !== 2) { | ||
| return { | ||
| testName: `INVALID TEST FILE [${pathRelativeToResources}]`, | ||
| originalCode: '', | ||
| expectedFormattedCode: '', | ||
| error: new SeparatorError(parts.length - 1), | ||
| }; | ||
| it.each(await formatterTests)('$testName (idempotence)', async (test) => { | ||
| // Test is invalid | ||
| if (test.error) { | ||
| throw test.error; | ||
| } | ||
|
|
||
| // Original code must not contain syntax errors | ||
| const originalCode = normalizeLineBreaks(parts[0]).trimEnd(); | ||
| const expectedFormattedCode = normalizeLineBreaks(parts[1]).trim(); | ||
|
|
||
| const validationResult = await validationHelper(services)(parts[0]); | ||
| const syntaxErrors = validationResult.diagnostics.filter( | ||
| (d) => d.severity === 1 && (d.code === 'lexing-error' || d.code === 'parsing-error'), | ||
| ); | ||
|
|
||
| if (syntaxErrors.length > 0) { | ||
| return { | ||
| testName: `INVALID TEST FILE [${pathRelativeToResources}]`, | ||
| originalCode, | ||
| expectedFormattedCode, | ||
| error: new SyntaxErrorsInOriginalCodeError(syntaxErrors), | ||
| }; | ||
| } | ||
| // Formatting must be idempotent | ||
| await expectFormatting(services)({ | ||
| before: test.expectedFormattedCode, | ||
| after: test.expectedFormattedCode, | ||
| }); | ||
|
|
||
| return { | ||
| testName: `${pathRelativeToResources} should be formatted correctly`, | ||
| originalCode, | ||
| expectedFormattedCode, | ||
| }; | ||
| // Clear loaded documents to avoid colliding URIs (https://github.com/langium/langium/issues/1146) | ||
| await clearDocuments(services); | ||
| }); | ||
|
|
||
| return Promise.all(testCases); | ||
| }; | ||
|
|
||
| const normalizeLineBreaks = (code: string): string => { | ||
| return code.replace(/\r\n?/gu, '\n'); | ||
| }; | ||
|
|
||
| interface FormatterTest { | ||
| testName: string; | ||
| originalCode: string; | ||
| expectedFormattedCode: string; | ||
| error?: Error; | ||
| } | ||
|
|
||
| class SeparatorError extends Error { | ||
| constructor(readonly number_of_separators: number) { | ||
| super(`Expected exactly one separator but found ${number_of_separators}.`); | ||
| } | ||
| } | ||
|
|
||
| class SyntaxErrorsInOriginalCodeError extends Error { | ||
| constructor(readonly syntaxErrors: Diagnostic[]) { | ||
| const syntaxErrorsAsString = syntaxErrors.map((e) => `- ${e.message}`).join(`\n`); | ||
|
|
||
| super(`Original code has syntax errors:\n${syntaxErrorsAsString}`); | ||
| } | ||
| } | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| import { listTestResources, resolvePathRelativeToResources } from '../helpers/testResources'; | ||
| import path from 'path'; | ||
| import fs from 'fs'; | ||
| import { findTestComments } from '../helpers/testComments'; | ||
| import { NoCommentsError } from '../helpers/testChecks'; | ||
|
|
||
| export const createGrammarTests = (): GrammarTest[] => { | ||
| return listTestResources('grammar').map((pathRelativeToResources): GrammarTest => { | ||
| const absolutePath = resolvePathRelativeToResources(path.join('grammar', pathRelativeToResources)); | ||
| const program = fs.readFileSync(absolutePath).toString(); | ||
| const comments = findTestComments(program); | ||
|
|
||
| // Must contain at least one comment | ||
| if (comments.length === 0) { | ||
| return { | ||
| testName: `INVALID TEST FILE [${pathRelativeToResources}]`, | ||
| program, | ||
| expectedResult: 'invalid', | ||
| error: new NoCommentsError(), | ||
| }; | ||
| } | ||
|
|
||
| // Must contain no more than one comment | ||
| if (comments.length > 1) { | ||
| return { | ||
| testName: `INVALID TEST FILE [${pathRelativeToResources}]`, | ||
| program, | ||
| expectedResult: 'invalid', | ||
| error: new MultipleCommentsError(comments), | ||
| }; | ||
| } | ||
|
|
||
| const comment = comments[0]; | ||
|
|
||
| // Must contain a valid comment | ||
| if (comment !== 'syntax_error' && comment !== 'no_syntax_error') { | ||
| return { | ||
| testName: `INVALID TEST FILE [${pathRelativeToResources}]`, | ||
| program, | ||
| expectedResult: 'invalid', | ||
| error: new InvalidCommentError(comment), | ||
| }; | ||
| } | ||
|
|
||
| let testName: string; | ||
| if (comment === 'syntax_error') { | ||
| testName = `[${pathRelativeToResources}] should have syntax errors`; | ||
| } else { | ||
| testName = `[${pathRelativeToResources}] should not have syntax errors`; | ||
| } | ||
|
|
||
| return { | ||
| testName, | ||
| program, | ||
| expectedResult: comment, | ||
| }; | ||
| }); | ||
| }; | ||
|
|
||
| /** | ||
| * A description of a grammar test. | ||
| */ | ||
| interface GrammarTest { | ||
| testName: string; | ||
| program: string; | ||
| expectedResult: 'syntax_error' | 'no_syntax_error' | 'invalid'; | ||
| error?: Error; | ||
| } | ||
|
|
||
| /** | ||
| * Found multiple test comments. | ||
| */ | ||
| class MultipleCommentsError extends Error { | ||
| constructor(readonly comments: string[]) { | ||
| super(`Found multiple test comments (grammar tests expect only one): ${comments}`); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Found one test comment but it was invalid. | ||
| */ | ||
| class InvalidCommentError extends Error { | ||
| constructor(readonly comment: string) { | ||
| super(`Invalid test comment (valid values are 'syntax_error' and 'no_syntax_error'): ${comment}`); | ||
| } | ||
| } |
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