diff --git a/lib/sensiplan/index.js b/lib/sensiplan/index.js
new file mode 100644
index 0000000..0d733f4
--- /dev/null
+++ b/lib/sensiplan/index.js
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+function getTemperatureStatus (targetDate) {
+  return '42'
+}
+
+export {
+  getTemperatureStatus
+}
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diff --git a/test/fixtures/regular-cycles.json b/test/fixtures/regular-cycles.json
new file mode 100644
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--- /dev/null
+++ b/test/fixtures/regular-cycles.json
@@ -0,0 +1 @@
+[{"date":"2018-04-30","bleeding":{"value":2}},{"date":"2018-05-08","temperature":{"value":36.48,"exclude":false}},{"date":"2018-05-09","temperature":{"value":36.46,"exclude":false}},{"date":"2018-05-10","temperature":{"value":36.4,"exclude":false}},{"date":"2018-05-11","temperature":{"value":36.38,"exclude":false}},{"date":"2018-05-12","temperature":{"value":36.57,"exclude":false},"bleeding":{"value":4}},{"date":"2018-05-13","temperature":{"value":36.51,"exclude":false},"bleeding":{"value":4}},{"date":"2018-05-14","temperature":{"value":36.64,"exclude":false},"bleeding":{"value":4}},{"date":"2018-05-15","temperature":{"value":36.5,"exclude":false},"bleeding":{"value":3}},{"date":"2018-05-16","temperature":{"value":36.74,"exclude":false}},{"date":"2018-05-17","temperature":{"value":36.74,"exclude":false}},{"date":"2018-05-18","temperature":{"value":36.85,"exclude":false}},{"date":"2018-05-29","bleeding":{"value":2}},{"date":"2018-06-04","temperature":{"value":36.7,"exclude":false}},{"date":"2018-06-05","temperature":{"value":36.57,"exclude":false}},{"date":"2018-06-06","temperature":{"value":36.47,"exclude":false}},{"date":"2018-06-07","temperature":{"value":36.49,"exclude":false}},{"date":"2018-06-08","bleeding":{"value":4}},{"date":"2018-06-09","temperature":{"value":36.57,"exclude":false},"bleeding":{"value":4}},{"date":"2018-06-10","temperature":{"value":36.62,"exclude":false},"bleeding":{"value":4}},{"date":"2018-06-11","temperature":{"value":36.55,"exclude":false},"bleeding":{"value":3}},{"date":"2018-06-12","temperature":{"value":36.8,"exclude":false}},{"date":"2018-06-13","temperature":{"value":36.86,"exclude":false}},{"date":"2018-06-14","temperature":{"value":36.82,"exclude":false}},{"date":"2018-06-24","bleeding":{"value":2}}]
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diff --git a/test/sensiplan.spec.js b/test/sensiplan.spec.js
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index 0000000..cd36646
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+++ b/test/sensiplan.spec.js
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+import chai from 'chai'
+import * as sensiplan from '../lib/sensiplan'
+import cycleDaysFixtures from './fixtures/regular-cycles.json'
+
+const expect = chai.expect
+
+describe('sensiplan', () => {
+  describe('getTemperatureStatus', () => {
+    it('detects temperature shift', function () {
+      const targetDate = '2018-06-14'
+      const status = sensiplan.getTemperatureStatus(targetDate, cycleDaysFixtures)
+      expect(status).to.eql({
+        lowerTemps: [36.6, 36.5, 36.5, 36.6, 36.6, 36.6],
+        ltl: 36.6,
+        higherTemps: [36.8, 36.9, 36.8],
+        shiftDetected: true
+      })
+    })
+  })
+})
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