Python support

Add python-xunit-parser.ts with associated case statement
Add python-xunit to reporter docs in action.yml
Add tests
Update README

Resolves #244
Resolves #633

__tests__/python-xunit.test.ts

@@ -0,0 +1,92 @@
+import * as fs from 'fs'
+import * as path from 'path'
+
+import {PythonXunitParser} from '../src/parsers/python-xunit/python-xunit-parser'
+import {ParseOptions} from '../src/test-parser'
+import {DEFAULT_OPTIONS, getReport} from '../src/report/get-report'
+import {normalizeFilePath} from '../src/utils/path-utils'
+
+describe('python-xunit tests', () => {
+  it('report from python test results matches snapshot', async () => {
+    const fixturePath = path.join(__dirname, 'fixtures', 'python-xunit.xml')
+    const outputPath = path.join(__dirname, '__outputs__', 'python-xunit.md')
+    const filePath = normalizeFilePath(path.relative(__dirname, fixturePath))
+    const fileContent = fs.readFileSync(fixturePath, {encoding: 'utf8'})
+
+    const trackedFiles = ['src/acme/test_lib.py']
+    const opts: ParseOptions = {
+      parseErrors: true,
+      trackedFiles
+    }
+
+    const parser = new PythonXunitParser(opts)
+    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)
+  })
+
+  it('report does not include a title by default', async () => {
+    const fixturePath = path.join(__dirname, 'fixtures', 'python-xunit.xml')
+    const filePath = normalizeFilePath(path.relative(__dirname, fixturePath))
+    const fileContent = fs.readFileSync(fixturePath, {encoding: 'utf8'})
+
+    const opts: ParseOptions = {
+      parseErrors: true,
+      trackedFiles: []
+    }
+
+    const parser = new PythonXunitParser(opts)
+    const result = await parser.parse(filePath, fileContent)
+    const report = getReport([result])
+    // Report should have the badge as the first line
+    expect(report).toMatch(/^!\[Tests failed]/)
+  })
+
+  it.each([
+    ['empty string', ''],
+    ['space', ' '],
+    ['tab', '\t'],
+    ['newline', '\n']
+  ])('report does not include a title when configured value is %s', async (_, reportTitle) => {
+    const fixturePath = path.join(__dirname, 'fixtures', 'python-xunit.xml')
+    const filePath = normalizeFilePath(path.relative(__dirname, fixturePath))
+    const fileContent = fs.readFileSync(fixturePath, {encoding: 'utf8'})
+
+    const opts: ParseOptions = {
+      parseErrors: true,
+      trackedFiles: []
+    }
+
+    const parser = new PythonXunitParser(opts)
+    const result = await parser.parse(filePath, fileContent)
+    const report = getReport([result], {
+      ...DEFAULT_OPTIONS,
+      reportTitle
+    })
+    // Report should have the badge as the first line
+    expect(report).toMatch(/^!\[Tests failed]/)
+  })
+
+  it('report includes a custom report title', async () => {
+    const fixturePath = path.join(__dirname, 'fixtures', 'python-xunit.xml')
+    const filePath = normalizeFilePath(path.relative(__dirname, fixturePath))
+    const fileContent = fs.readFileSync(fixturePath, {encoding: 'utf8'})
+
+    const opts: ParseOptions = {
+      parseErrors: true,
+      trackedFiles: []
+    }
+
+    const parser = new PythonXunitParser(opts)
+    const result = await parser.parse(filePath, fileContent)
+    const report = getReport([result], {
+      ...DEFAULT_OPTIONS,
+      reportTitle: 'My Custom Title'
+    })
+    // Report should have the title as the first line
+    expect(report).toMatch(/^# My Custom Title\n/)
+  })
+})