introduce Scorer class

Author: kaiosilveira

src/index.js

@@ -19,3 +19,27 @@ export function score(candidate, medicalExam, scoringGuide) {
 
   return result;
 }
+
+export class Scorer {
+  execute(candidate, medicalExam, scoringGuide) {
+    let result = 0;
+    let healthLevel = 0;
+    let highMedicalRiskFlag = false;
+
+    if (medicalExam.isSmoker) {
+      healthLevel += 10;
+      highMedicalRiskFlag = true;
+    }
+
+    let certificationGrade = 'regular';
+    if (scoringGuide.stateWithLowCertification(candidate.originState)) {
+      certificationGrade = 'low';
+      result -= 5;
+    }
+
+    // lots more code like this
+    result -= Math.max(healthLevel - 5, 0);
+
+    return result;
+  }
+}

src/index.test.js

@@ -1,4 +1,4 @@
-import { score } from './index';
+import { score, Scorer } from './index';
 
 describe('score', () => {
   it('should return 0 if candidate is not a smoker and has a regular certification grade', () => {
@@ -33,3 +33,41 @@ describe('score', () => {
     expect(score(candidate, medicalExam, scoringGuide)).toBe(-10);
   });
 });
+
+describe('Scorer', () => {
+  it('should return 0 if candidate is not a smoker and has a regular certification grade', () => {
+    const candidate = { originState: 'FL' };
+    const medicalExam = { isSmoker: false };
+    const scoringGuide = { stateWithLowCertification: () => false };
+
+    const scorer = new Scorer();
+    expect(scorer.execute(candidate, medicalExam, scoringGuide)).toBe(0);
+  });
+
+  it('should return -5 if candidate is not a smoker and has a low certification grade', () => {
+    const candidate = { originState: 'FL' };
+    const medicalExam = { isSmoker: false };
+    const scoringGuide = { stateWithLowCertification: () => true };
+
+    const scorer = new Scorer();
+    expect(scorer.execute(candidate, medicalExam, scoringGuide)).toBe(-5);
+  });
+
+  it('should return -5 if candidate is a smoker and has a regular certification grade', () => {
+    const candidate = { originState: 'FL' };
+    const medicalExam = { isSmoker: true };
+    const scoringGuide = { stateWithLowCertification: () => false };
+
+    const scorer = new Scorer();
+    expect(scorer.execute(candidate, medicalExam, scoringGuide)).toBe(-5);
+  });
+
+  it('should return -10 if candidate is a smoker and has a low certification grade', () => {
+    const candidate = { originState: 'FL' };
+    const medicalExam = { isSmoker: true };
+    const scoringGuide = { stateWithLowCertification: () => true };
+
+    const scorer = new Scorer();
+    expect(scorer.execute(candidate, medicalExam, scoringGuide)).toBe(-10);
+  });
+});