diff --git a/src/app/network-call/network-call.component.html b/src/app/network-call/network-call.component.html
index bcf449f..c97b04b 100644
--- a/src/app/network-call/network-call.component.html
+++ b/src/app/network-call/network-call.component.html
@@ -2,15 +2,15 @@
     <h1>Les appels réseaux - Promesses ou Observables ?</h1>
     <div class="actions">
         <button mat-raised-button
-                (click)="loadCar()"
+                (click)="loadCarViaAPromise()"
                 [disabled]="isLoading$ | async">
-            Load the car
+            🙏 Load the car via a Promise
         </button>
 
         <button mat-raised-button
                 (click)="loadCarViaAnObservable()"
                 [disabled]="isLoading$ | async">
-            Load the car
+            👁️ Load the car via an Observable
         </button>
     </div>
     <div class="loading" *ngIf="isLoading$ | async">
diff --git a/src/app/network-call/network-call.component.ts b/src/app/network-call/network-call.component.ts
index 7c576df..077873c 100644
--- a/src/app/network-call/network-call.component.ts
+++ b/src/app/network-call/network-call.component.ts
@@ -26,7 +26,7 @@ export class NetworkCallComponent {
         return this.isLoadingSubject.asObservable();
     }
 
-    loadCar(): void {
+    loadCarViaAPromise(): void {
         this.loadThroughAPromise();
     }
 
diff --git a/src/app/observables-example/observables-example.component.spec.ts b/src/app/observables-example/observables-example.component.spec.ts
deleted file mode 100644
index 3c1c879..0000000
--- a/src/app/observables-example/observables-example.component.spec.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import { ComponentFixture, TestBed } from '@angular/core/testing';
-
-import { ObservablesExampleComponent } from './observables-example.component';
-
-describe('ObservablesExampleComponent', () => {
-  let component: ObservablesExampleComponent;
-  let fixture: ComponentFixture<ObservablesExampleComponent>;
-
-  beforeEach(async () => {
-    await TestBed.configureTestingModule({
-      declarations: [ ObservablesExampleComponent ]
-    })
-    .compileComponents();
-
-    fixture = TestBed.createComponent(ObservablesExampleComponent);
-    component = fixture.componentInstance;
-    fixture.detectChanges();
-  });
-
-  it('should create', () => {
-    expect(component).toBeTruthy();
-  });
-});
diff --git a/src/app/promises-example/promises-example.component.html b/src/app/promises-example/promises-example.component.html
index a04c983..a6c7db3 100644
--- a/src/app/promises-example/promises-example.component.html
+++ b/src/app/promises-example/promises-example.component.html
@@ -2,13 +2,11 @@
     <h1>Les promesses</h1>
     <div class="actions">
         <button mat-raised-button (click)="showCarViaAPromise()" [disabled]="isLoading">
-            <mat-icon>visibility</mat-icon>
-            Show car via a Promise
+            🙏 Show car via a Promise
         </button>
 
         <button mat-raised-button (click)="showCarViaAsyncAwaitProcess()" [disabled]="isLoading">
-            <mat-icon>visibility</mat-icon>
-            Show car via an Async Await process
+            ⏱️ Show car via an Async Await process
         </button>
     </div>
 
diff --git a/src/app/promises-example/promises-example.component.spec.ts b/src/app/promises-example/promises-example.component.spec.ts
deleted file mode 100644
index a560691..0000000
--- a/src/app/promises-example/promises-example.component.spec.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import { ComponentFixture, TestBed } from '@angular/core/testing';
-
-import { PromisesExampleComponent } from './promises-example.component';
-
-describe('PromisesExampleComponent', () => {
-  let component: PromisesExampleComponent;
-  let fixture: ComponentFixture<PromisesExampleComponent>;
-
-  beforeEach(async () => {
-    await TestBed.configureTestingModule({
-      declarations: [ PromisesExampleComponent ]
-    })
-    .compileComponents();
-
-    fixture = TestBed.createComponent(PromisesExampleComponent);
-    component = fixture.componentInstance;
-    fixture.detectChanges();
-  });
-
-  it('should create', () => {
-    expect(component).toBeTruthy();
-  });
-});
diff --git a/src/app/promises-example/promises-example.component.ts b/src/app/promises-example/promises-example.component.ts
index da608ab..a3b592e 100644
--- a/src/app/promises-example/promises-example.component.ts
+++ b/src/app/promises-example/promises-example.component.ts
@@ -43,7 +43,7 @@ export class PromisesExampleComponent {
                 this.isLoaded = true;
             })
             .catch(error => {
-                this.snackBar.open(`Error while loading car. Cause : ${error}`);
+                this.snackBar.open(`Error while loading car. Cause : ${error}`, 'Close', { duration: 5000 });
             })
             .finally(() => {
                 this.isLoading = false;
@@ -78,7 +78,7 @@ export class PromisesExampleComponent {
             this.car = await this.findViaAsyncAwaitProcess();
             this.isLoaded = true;
         } catch (error) {
-            this.snackBar.open(`Error while loading car. Cause : ${error}`);
+            this.snackBar.open(`Error while loading car. Cause : ${error}`, 'Close', { duration: 5000 });
         }
 
         this.numberOfLoadings++;
diff --git a/src/app/state-management-example/state-management-example.component.spec.ts b/src/app/state-management-example/state-management-example.component.spec.ts
deleted file mode 100644
index 9304eba..0000000
--- a/src/app/state-management-example/state-management-example.component.spec.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import { ComponentFixture, TestBed } from '@angular/core/testing';
-
-import { StateManagementExampleComponent } from './state-management-example.component';
-
-describe('StateManagementExampleComponent', () => {
-  let component: StateManagementExampleComponent;
-  let fixture: ComponentFixture<StateManagementExampleComponent>;
-
-  beforeEach(async () => {
-    await TestBed.configureTestingModule({
-      declarations: [ StateManagementExampleComponent ]
-    })
-    .compileComponents();
-
-    fixture = TestBed.createComponent(StateManagementExampleComponent);
-    component = fixture.componentInstance;
-    fixture.detectChanges();
-  });
-
-  it('should create', () => {
-    expect(component).toBeTruthy();
-  });
-});