Test error conditions.

Fix 412 template to use standard styling that the other 400 templates use.
Update forbidden error to return status code 403 instead of 400.

Signed-off-by: Mike Terzo <mike@terzo.org>

test/test_app_error.py

@@ -0,0 +1,73 @@
+import pytest
+from flask import Flask, current_app
+from puppetboard import app
+
+from bs4 import BeautifulSoup
+
+
+@pytest.fixture
+def mock_puppetdb_environments(mocker):
+    environemnts = [
+        {'name': 'production'},
+        {'name': 'staging'}
+    ]
+
+    return mocker.patch.object(app.puppetdb, 'environments',
+                               return_value=environemnts)
+
+
+def test_error_no_content():
+    result = app.no_content(None)
+    assert result[0] == ''
+    assert result[1] == 204
+
+
+def test_error_bad_request(mock_puppetdb_environments):
+    with app.app.test_request_context():
+        (output, error_code) = app.bad_request(None)
+        soup = BeautifulSoup(output, 'html.parser')
+
+        assert 'The request sent to PuppetDB was invalid' in soup.p.text
+        assert error_code == 400
+
+
+def test_error_forbidden(mock_puppetdb_environments):
+    with app.app.test_request_context():
+        (output, error_code) = app.forbidden(None)
+        soup = BeautifulSoup(output, 'html.parser')
+
+        long_string = "%s %s" % ('What you were looking for has',
+                                 'been disabled by the administrator')
+        assert long_string in soup.p.text
+        assert error_code == 403
+
+
+def test_error_not_found(mock_puppetdb_environments):
+    with app.app.test_request_context():
+        (output, error_code) = app.not_found(None)
+        soup = BeautifulSoup(output, 'html.parser')
+
+        long_string = "%s %s" % ('What you were looking for could not',
+                                 'be found in PuppetDB.')
+        assert long_string in soup.p.text
+        assert error_code == 404
+
+
+def test_error_precond(mock_puppetdb_environments):
+    with app.app.test_request_context():
+        (output, error_code) = app.precond_failed(None)
+        soup = BeautifulSoup(output, 'html.parser')
+
+        long_string = "%s %s" % ('You\'ve configured Puppetboard with an API',
+                                 'version that does not support this feature.')
+        assert long_string in soup.p.text
+        assert error_code == 412
+
+
+def test_error_server(mock_puppetdb_environments):
+    with app.app.test_request_context():
+        (output, error_code) = app.server_error(None)
+        soup = BeautifulSoup(output, 'html.parser')
+
+        assert 'Internal Server Error' in soup.h2.text
+        assert error_code == 500