feat: introduce dioc into hoppscotch-common

packages/dioc/lib/testing.ts

@@ -0,0 +1,33 @@
+import { Container, Service } from "./main";
+
+/**
+ * A container that can be used for writing tests, contains additional methods
+ * for binding suitable for writing tests. (see `bindMock`).
+ */
+export class TestContainer extends Container {
+
+  /**
+   * Binds a mock service to the container.
+   *
+   * @param service
+   * @param mock
+   */
+  public bindMock<
+    T extends typeof Service<any> & { ID: string },
+    U extends Partial<InstanceType<T>>
+  >(service: T, mock: U): U {
+    if (this.boundMap.has(service.ID)) {
+      throw new Error(`Service '${service.ID}' already bound to container. Did you already call bindMock on this ?`)
+    }
+
+    this.boundMap.set(service.ID, mock as any)
+
+    this.event$.next({
+      type: "SERVICE_BIND",
+      boundeeID: service.ID,
+      bounderID: undefined,
+    })
+
+    return mock
+  }
+}