Test in the simplest situation.

.gitignore

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+# Created by https://www.gitignore.io
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+### Python ###
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+*.py[cod]
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+# C extensions
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+# PyBuilder
+target/
+

tests/test_simple.py

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+from flask import Flask
+from flask_sslify import SSLify
+from pytest import fixture
+
+
+@fixture
+def sslify():
+    app = Flask(__name__)
+    app.config['DEBUG'] = False
+    app.config['TESTING'] = False
+    app.config['SERVER_NAME'] = 'example.com'
+    sslify = SSLify(app)
+
+    @app.route('/')
+    def home():
+        return 'home'
+
+    return sslify
+
+
+def test_default_config(sslify):
+    assert sslify.hsts_include_subdomains is False
+    assert sslify.permanent is False
+    assert sslify.skip_list is None
+
+
+def test_redirection(sslify):
+    client = sslify.app.test_client()
+    r = client.get('/')
+    assert r.status_code == 302
+    assert r.headers['Location'] == 'https://example.com/'
+
+
+def test_hsts_header(sslify):
+    client = sslify.app.test_client()
+    r = client.get('/', base_url='https://example.com')
+    assert r.status_code == 200
+    assert r.data == 'home'
+    assert r.headers['Strict-Transport-Security'] == 'max-age=31536000'