Added comprehensive unit test coverage for Container Copy jobs (#2275)

* copy job uts

* unit test coverage

* lint fix

* normalize account dropdown id

src/Explorer/ContainerCopy/CreateCopyJob/Screens/CreateCopyJobScreensProvider.test.tsx

@@ -0,0 +1,95 @@
+import { shallow } from "enzyme";
+import Explorer from "Explorer/Explorer";
+import React from "react";
+import CreateCopyJobScreensProvider from "./CreateCopyJobScreensProvider";
+
+jest.mock("../../Context/CopyJobContext", () => ({
+  __esModule: true,
+  default: ({ children, explorer }: { children: React.ReactNode; explorer: Explorer }) => (
+    <div data-testid="copy-job-context-provider" data-explorer={explorer ? "explorer-instance" : "null"}>
+      {children}
+    </div>
+  ),
+}));
+
+jest.mock("./CreateCopyJobScreens", () => ({
+  __esModule: true,
+  default: () => <div data-testid="create-copy-job-screens">CreateCopyJobScreens</div>,
+}));
+
+const mockExplorer = {
+  databaseAccount: {
+    id: "test-account",
+    name: "test-account-name",
+    location: "East US",
+    type: "DocumentDB",
+    kind: "GlobalDocumentDB",
+    properties: {
+      documentEndpoint: "https://test-account.documents.azure.com:443/",
+      gremlinEndpoint: "https://test-account.gremlin.cosmosdb.azure.com:443/",
+      tableEndpoint: "https://test-account.table.cosmosdb.azure.com:443/",
+      cassandraEndpoint: "https://test-account.cassandra.cosmosdb.azure.com:443/",
+    },
+  },
+  subscriptionId: "test-subscription-id",
+  resourceGroup: "test-resource-group",
+} as unknown as Explorer;
+
+describe("CreateCopyJobScreensProvider", () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it("should render with explorer prop", () => {
+    const wrapper = shallow(<CreateCopyJobScreensProvider explorer={mockExplorer} />);
+    expect(wrapper).toMatchSnapshot();
+  });
+
+  it("should render with null explorer", () => {
+    const wrapper = shallow(<CreateCopyJobScreensProvider explorer={null as unknown as Explorer} />);
+    expect(wrapper).toMatchSnapshot();
+  });
+
+  it("should render with undefined explorer", () => {
+    const wrapper = shallow(<CreateCopyJobScreensProvider explorer={undefined as unknown as Explorer} />);
+    expect(wrapper).toMatchSnapshot();
+  });
+
+  it("should not crash with minimal explorer object", () => {
+    const minimalExplorer = {} as Explorer;
+
+    expect(() => {
+      const wrapper = shallow(<CreateCopyJobScreensProvider explorer={minimalExplorer} />);
+      expect(wrapper).toBeDefined();
+    }).not.toThrow();
+  });
+
+  it("should match snapshot for default render", () => {
+    const wrapper = shallow(<CreateCopyJobScreensProvider explorer={mockExplorer} />);
+    expect(wrapper).toMatchSnapshot("default-render");
+  });
+
+  it("should match snapshot for edge cases", () => {
+    const emptyExplorer = {} as Explorer;
+    const wrapperEmpty = shallow(<CreateCopyJobScreensProvider explorer={emptyExplorer} />);
+    expect(wrapperEmpty).toMatchSnapshot("empty-explorer");
+
+    const partialExplorer = {
+      databaseAccount: { id: "partial-account" },
+    } as unknown as Explorer;
+    const wrapperPartial = shallow(<CreateCopyJobScreensProvider explorer={partialExplorer} />);
+    expect(wrapperPartial).toMatchSnapshot("partial-explorer");
+  });
+
+  describe("Error Boundaries and Edge Cases", () => {
+    it("should handle React rendering errors gracefully", () => {
+      const edgeCases = [null, undefined, {}, { invalidProperty: "test" }];
+
+      edgeCases.forEach((explorerCase) => {
+        expect(() => {
+          shallow(<CreateCopyJobScreensProvider explorer={explorerCase as unknown as Explorer} />);
+        }).not.toThrow();
+      });
+    });
+  });
+});