First check-in of the code from the Obsidian Prj project.

src/__tests__/DIContainer.test.ts

@@ -0,0 +1,4 @@
+import { test_IDIContainer } from './IDIContainer.spec';
+import { DIContainer } from '../DIContainer';
+
+test_IDIContainer(DIContainer);

src/__tests__/IDIContainer.spec.ts

@@ -0,0 +1,35 @@
+import { ITSInjex_, ITSInjex } from '../interfaces/IDIContainer';
+
+/**
+ * Test the implementation of a DIContainer
+ * @param Container The DIContainer implementation to test.
+ * Must implement {@link ITSInjex}, {@link ITSInjex_}
+ */
+export function test_IDIContainer(Container: ITSInjex_): void {
+    describe('IDIContainer Implementation Tests', () => {
+        let container: ITSInjex;
+
+        beforeEach(() => {
+            container = Container.getInstance();
+        });
+
+        it('should register and resolve a dependency', () => {
+            const identifier = 'myDependency';
+            const dependency = { value: 42 };
+
+            container.register(identifier, dependency);
+
+            const resolvedDependency =
+                container.resolve<typeof dependency>(identifier);
+            expect(resolvedDependency).toBe(dependency);
+        });
+
+        it('should throw an error when resolving a non-registered dependency', () => {
+            const identifier = 'nonExistentDependency';
+
+            expect(() => container.resolve<unknown>(identifier)).toThrow();
+        });
+
+        // Add more tests as necessary
+    });
+}