Add blend pricing tests

projects/planner/src/app/shared/blend-pricing.service.spec.ts

@@ -0,0 +1,26 @@
+import { TestBed } from '@angular/core/testing';
+import { BlendPricingService } from './blend-pricing.service';
+import { GasBlenderService } from './gas-blender.service';
+import { UnitConversion } from './UnitConversion';
+
+describe('BlendPricingService', () => {
+    let sut: BlendPricingService;
+
+    beforeEach(() => {
+        TestBed.configureTestingModule({
+            providers: [BlendPricingService, GasBlenderService, UnitConversion]
+        });
+
+        sut = TestBed.inject(BlendPricingService);
+    });
+
+    it('should calculate prices based on unit price and amount of gases', () => {
+
+        sut.calculate();
+
+        expect(sut.o2Price).toBe(0);
+        expect(sut.hePrice).toBe(0);
+        expect(sut.topMixPrice).toBe(0);
+        expect(sut.totalPrice).toBe(0);
+    });
+});

projects/planner/src/app/shared/blend-pricing.service.ts

@@ -1,7 +1,5 @@
 import { Injectable } from '@angular/core';
-import {
-    BlendPricing
-} from 'scuba-physics';
+import {BlendPricing} from 'scuba-physics';
 import { GasBlenderService } from './gas-blender.service';
 
 @Injectable()

projects/scuba-physics/src/lib/blendPricing.spec.ts

@@ -0,0 +1,27 @@
+import { BlendPricing, BlendCosts, BlendPrice } from './blendPricing';
+
+describe('BlendPricing', () => {
+    /** we will not test negative numbers */
+    it('should calculate prices according declared amount and price of gas', () => {
+
+        const costs: BlendCosts = {
+            addO2: 2,
+            o2UnitPrice: 5,
+            addHe: 3,
+            heUnitPrice: 8,
+            addTop: 4,
+            topMixUnitPrice: 10
+        };
+
+        const expected: BlendPrice = {
+            o2Price: 10,
+            hePrice: 24,
+            topMixPrice: 40,
+            totalPrice: 74
+        };
+
+        const result = BlendPricing.price(costs);
+
+        expect(result).toEqual(expected);
+    });
+});