good start

__tests__/lcov.test.ts

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+import * as fs from 'fs'
+import * as path from 'path'
+
+import {getReport} from '../src/report/get-report'
+import {normalizeFilePath} from '../src/utils/path-utils'
+import { LcovParser } from "../src/parsers/lcov-json/lcov-parser";
+
+describe('lcov report coverage', () => {
+
+  it('report from facebook/jest test results matches snapshot', async () => {
+    const fixturePath = path.join(__dirname, 'fixtures', 'lcov.json')
+    const outputPath = path.join(__dirname, '__outputs__', 'lcov-report-results.md')
+    const filePath = normalizeFilePath(path.relative(__dirname, fixturePath))
+    const fileContent = fs.readFileSync(fixturePath, {encoding: 'utf8'})
+
+
+    const parser = new LcovParser()
+    const result = await parser.parse(filePath, fileContent)
+    expect(result).toMatchSnapshot()
+
+    const report = getReport([result])
+    fs.mkdirSync(path.dirname(outputPath), {recursive: true})
+    fs.writeFileSync(outputPath, report)
+  })
+})