Add declared requirements install test (#1)

Add unit test for verifying requirements installation to declared venv

Author: acullenn

spec/acceptance/declared_requirements_install_spec.rb

@@ -0,0 +1,24 @@
+require 'spec_helper_acceptance'
+
+describe 'requirements' do
+  it 'checks declared requirements file is installed to venv' do
+    pp = <<-EOS
+    file { '/tmp/requirements.txt':
+      ensure  => 'present',
+      content => 'requests',
+    }
+
+    python::pyvenv { '/tmp/pyvenv':
+      ensure  => 'present',
+    }
+
+    python::requirements { '/tmp/requirements.txt':
+      virtualenv => '/tmp/pyvenv'
+    }
+    EOS
+
+    apply_manifest(pp, catch_failures: true)
+
+    expect(shell('/tmp/pyvenv/bin/pip3 list --no-index | grep requests').stdout).to match(%r{requests +\d+.\d+.\d+})
+  end
+end