Add mucus shift detection

test/sympto/mucus.spec.js

@@ -0,0 +1,49 @@
+import chai from 'chai'
+import getMucusStatus from '../../lib/sympto/mucus'
+
+const expect = chai.expect
+
+function turnIntoCycleDayObject(value, fakeDate) {
+  return {
+    mucus : { value },
+    date: fakeDate
+  }
+}
+
+describe('sympto', () => {
+  describe('detect mucus shift', () => {
+    describe('regular rule', () => {
+      it('detects mucus shift correctly', function () {
+        const values = [0, 0, 0, 1, 1, 2, 2, 2, 3, 3, 3, 2, 2, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0]
+          .map(turnIntoCycleDayObject)
+        const status = getMucusStatus(values)
+        expect(status).to.eql({
+          detected: true,
+          mucusPeak: {
+            date: 10,
+            mucus: { value: 3 }
+          }
+        })
+      })
+
+      it('detects no mucus shift when there are less than 3 days of lower quality', function () {
+        const values = [0, 1, 1, 2, 0, 0, 1, 2, 3, 2, 3, 3, 3, 2, 2]
+          .map(turnIntoCycleDayObject)
+        const status = getMucusStatus(values)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects no mucus shift when there are no mucus values', function () {
+        const status = getMucusStatus(Array(10).fill({date: 1, temperature: { value: 35}}))
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects no mucus shift when the mucus values are all the same', function () {
+        const values = [2, 2, 2, 2, 2, 2, 2, 2]
+          .map(turnIntoCycleDayObject)
+        const status = getMucusStatus(values)
+        expect(status).to.eql({ detected: false })
+      })
+    })
+  })
+})