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__/__outputs__/python-xunit.md

@@ -0,0 +1,17 @@
+![Tests failed](https://img.shields.io/badge/tests-2%20passed%2C%201%20failed-critical)
+|Report|Passed|Failed|Skipped|Time|
+|:---|---:|---:|---:|---:|
+|[fixtures/python-xunit.xml](#user-content-r0)|2 ✅|1 ❌||220ms|
+## ❌ <a id="user-content-r0" href="#user-content-r0">fixtures/python-xunit.xml</a>
+**3** tests were completed in **220ms** with **2** passed, **1** failed and **0** skipped.
+|Test suite|Passed|Failed|Skipped|Time|
+|:---|---:|---:|---:|---:|
+|[pytest](#user-content-r0s0)|2 ✅|1 ❌||220ms|
+### ❌ <a id="user-content-r0s0" href="#user-content-r0s0">pytest</a>
+```
+src.acme.test_lib
+  ✅ test_always_pass
+  ✅ test_always_skip
+  ❌ test_always_fail
+	failed
+```

__tests__/__snapshots__/python-xunit.test.ts.snap

@@ -0,0 +1,44 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`python-xunit tests report from python test results matches snapshot 1`] = `
+TestRunResult {
+  "path": "fixtures/python-xunit.xml",
+  "suites": [
+    TestSuiteResult {
+      "groups": [
+        TestGroupResult {
+          "name": "src.acme.test_lib",
+          "tests": [
+            TestCaseResult {
+              "error": undefined,
+              "name": "test_always_pass",
+              "result": "success",
+              "time": 36.386333,
+            },
+            TestCaseResult {
+              "error": undefined,
+              "name": "test_always_skip",
+              "result": "success",
+              "time": 92.039167,
+            },
+            TestCaseResult {
+              "error": {
+                "details": undefined,
+                "line": undefined,
+                "message": "failed",
+                "path": undefined,
+              },
+              "name": "test_always_fail",
+              "result": "failed",
+              "time": 92.05175,
+            },
+          ],
+        },
+      ],
+      "name": "pytest",
+      "totalTime": 220.47725000000003,
+    },
+  ],
+  "totalTime": undefined,
+}
+`;

__tests__/fixtures/python-xunit.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<testsuites>
+  <testsuite name="pytest" errors="0" tests="3" failures="1" time="0.22047725">
+    <testcase classname="src.acme.test_lib" name="test_always_pass" time="0.036386333" file="src/acme/test_lib.py">
+    </testcase>
+    <testcase classname="src.acme.test_lib" name="test_always_skip" time="0.092039167" file="src/acme/test_lib.py">
+    </testcase>
+    <testcase classname="src.acme.test_lib" name="test_always_fail" time="0.09205175" file="src/acme/test_lib.py">
+      <failure message="failed"></failure>
+    </testcase>
+  </testsuite>
+</testsuites>

__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/)
+  })
+})