first commit

src/app/dispense-item/dispense-item.component.html

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+<p>
+  dispense-item works!
+  <button class="button" (click)='dispenseItem()'>Dispense Item</button>
+</p>

src/app/dispense-item/dispense-item.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { DispenseItemComponent } from './dispense-item.component';
+
+describe('DispenseItemComponent', () => {
+  let component: DispenseItemComponent;
+  let fixture: ComponentFixture<DispenseItemComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ DispenseItemComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(DispenseItemComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/dispense-item/dispense-item.component.ts

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+import { Component, OnInit } from '@angular/core';
+import { ItemService } from '../item/item.service';
+import { BalanceService } from '../balance/balance.service';
+
+@Component({
+  selector: 'app-dispense-item',
+  templateUrl: './dispense-item.component.html',
+  styleUrls: ['./dispense-item.component.css']
+})
+export class DispenseItemComponent implements OnInit {
+
+  constructor(private itemService: ItemService, private balanceService: BalanceService) { }
+
+  ngOnInit() {
+  }
+  dispenseItem() {
+    const currentBalance = this.balanceService.getBalance();
+    if (this.itemService.hasSufficientBalance(currentBalance)) {
+      alert("insufficient balance");
+    }
+    else if (this.itemService.hasRemaining()) {
+      alert("none left");
+    }
+    else (  this.itemService.dispenseItem((item)=> {
+      (this.balanceService.deductBalance(item.cost))
+      // alert('enjoy your ', item);
+    })
+};

src/app/select-item/select-item.component.html

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+<li *ngFor='let item of items'>
+  <input type='radio' [value]='item.id'
+  name='items-list' (change)='onItemSelected(item)'>{{item.name}}
+</li>

src/app/select-item/select-item.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { SelectItemComponent } from './select-item.component';
+
+describe('SelectItemComponent', () => {
+  let component: SelectItemComponent;
+  let fixture: ComponentFixture<SelectItemComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ SelectItemComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(SelectItemComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/select-item/select-item.component.ts

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+import { Component, OnInit } from '@angular/core';
+import { ItemService } from '../item/item.service';
+
+@Component({
+  selector: 'app-select-item',
+  templateUrl: './select-item.component.html',
+  styleUrls: ['./select-item.component.css']
+})
+export class SelectItemComponent implements OnInit {
+  public items;
+  constructor(public itemService: ItemService) { }
+
+  ngOnInit() {
+    this.itemService.onItemsRetrieved((items)=> {
+      this.items = items;
+    })
+  }
+
+  onItemSelected(item) {
+    this.itemService.setSelectedItem(item);
+  }
+
+}