List tasks feature (#4)

This PR contains the work done to implement the **List Tasks** feature, and to integrate it into the main content view of the app.

Reviewed-on: rock-n-code/todos-app#4
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

UnitTests/Tests/View Models/NewTaskViewModelTests.swift

@@ -124,10 +124,7 @@ struct NewTaskViewModelTests {
     @MainActor
     func saveWithAllProperties() throws {
         // GIVEN
-        let container = try ModelContainer(
-            for: Todo.self,
-            configurations: .init(isStoredInMemoryOnly: true)
-        )
+        let container = try modelContainer
         let context = container.mainContext
         let viewModel = NewTaskView.ViewModel()
 
@@ -153,10 +150,7 @@ struct NewTaskViewModelTests {
     @MainActor
     func saveWithEmptyNote() throws {
         // GIVEN
-        let container = try ModelContainer(
-            for: Todo.self,
-            configurations: .init(isStoredInMemoryOnly: true)
-        )
+        let container = try modelContainer
         let context = container.mainContext
         let viewModel = NewTaskView.ViewModel()
 
@@ -182,10 +176,7 @@ struct NewTaskViewModelTests {
     @MainActor
     func saveWithWhitespaceNote() throws {
         // GIVEN
-        let container = try ModelContainer(
-            for: Todo.self,
-            configurations: .init(isStoredInMemoryOnly: true)
-        )
+        let container = try modelContainer
         let context = container.mainContext
         let viewModel = NewTaskView.ViewModel()
 
@@ -211,10 +202,7 @@ struct NewTaskViewModelTests {
     @MainActor
     func saveMultipleTodos() throws {
         // GIVEN
-        let container = try ModelContainer(
-            for: Todo.self,
-            configurations: .init(isStoredInMemoryOnly: true)
-        )
+        let container = try modelContainer
         let context = container.mainContext
         let viewModelFirst = NewTaskView.ViewModel()
         let viewModelSecond = NewTaskView.ViewModel()
@@ -237,3 +225,20 @@ struct NewTaskViewModelTests {
     }
 
 }
+
+// MARK: - Helpers
+
+private extension NewTaskViewModelTests {
+    
+    // MARK: Computed
+    
+    var modelContainer: ModelContainer {
+        get throws {
+            try ModelContainer(
+                for: Todo.self,
+                configurations: .init(isStoredInMemoryOnly: true)
+            )
+        }
+    }
+    
+}