✅[SparkDI][Dependency Graph][WIP]- add xctestcase tests

Author: WalidSASSI-Sephora

Sources/SparkDI/DependencyContainer.swift

@@ -14,6 +14,8 @@ public enum Scope {
 public enum DependencyError: Error {
 
     case circularDependency
+    
+    case missingDependency
 }
 
 public actor DependencyContainer {

Tests/SparkDITests/DependencyGraphTests.swift

@@ -23,7 +23,7 @@ class ServiceB {
 
 #if canImport(Testing)
 
-struct DependencyGraphTests {
+struct DependencyGraphTesting {
 
     @Test func circularDependency() async throws {
         let dependencyContainer = DependencyContainer()
@@ -72,3 +72,50 @@ struct DependencyGraphTests {
 
 }
 #endif
+class DependencyGraphTests: XCTestCase {
+    func testCircularDependency() async throws {
+        let dependencyContainer = DependencyContainer()
+        do {
+            try await dependencyContainer.register(
+                type: ServiceA.self,
+                factory: { args in
+                    guard let serviceB = args.first as? ServiceB else { fatalError("Invalid arguments") }
+                    
+                    return ServiceA(serviceB: serviceB)
+                },
+                argumentsTypes: [ServiceB.self],
+                scope: .transient
+            )
+            
+            try await dependencyContainer.register(
+                type: ServiceB.self,
+                factory: { args in
+                    guard let serviceA = args.first as? ServiceA else { fatalError("Invalid arguments") }
+                    
+                    return ServiceB(serviceA: serviceA)
+                },
+                argumentsTypes: [ServiceA.self],
+                scope: .transient
+            )
+
+            XCTFail("Should have thrown circular dependency error")
+
+        } catch let error as DependencyError {
+
+            switch error {
+
+            case .circularDependency:
+
+                break
+
+            default:
+
+                XCTFail("Wrong error type: expected circular dependency")
+            }
+        } catch {
+
+            XCTFail("Unexpected error: \(error)")
+        }
+    }
+
+}