Split [pypi] tests (#3704)

* Split [pypi] tests

* Changed filenames to match previous class names

services/pypi/pypi-python-versions.tester.js

@@ -0,0 +1,39 @@
+'use strict'
+
+const Joi = require('@hapi/joi')
+const t = (module.exports = require('../tester').createServiceTester())
+
+// These regexes are the same, but declared separately for clarity.
+const isPipeSeparatedPythonVersions = Joi.string().regex(
+  /^([0-9]+\.[0-9]+(?: \| )?)+$/
+)
+
+t.create('python versions (valid, package version in request)')
+  .get('/requests/2.18.4.json')
+  .expectBadge({
+    label: 'python',
+    message: isPipeSeparatedPythonVersions,
+  })
+
+t.create('python versions (valid, no package version specified)')
+  .get('/requests.json')
+  .expectBadge({
+    label: 'python',
+    message: isPipeSeparatedPythonVersions,
+  })
+
+t.create('python versions ("Only" and others)')
+  .get('/uvloop/0.12.1.json')
+  .expectBadge({ label: 'python', message: '3.5 | 3.6 | 3.7' })
+
+t.create('python versions ("Only" only)')
+  .get('/hashpipe/0.9.1.json')
+  .expectBadge({ label: 'python', message: '3' })
+
+t.create('python versions (no versions specified)')
+  .get('/pyshp/1.2.12.json')
+  .expectBadge({ label: 'python', message: 'missing' })
+
+t.create('python versions (invalid)')
+  .get('/not-a-package.json')
+  .expectBadge({ label: 'python', message: 'package or version not found' })