diff --git a/src/store/__tests__/workflowStore.integration.test.ts b/src/store/__tests__/workflowStore.integration.test.ts
new file mode 100644
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+++ b/src/store/__tests__/workflowStore.integration.test.ts
@@ -0,0 +1,432 @@
+/**
+ * Integration tests for workflowStore
+ *
+ * Tests the integration functions that handle node connections and data flow:
+ * - getConnectedInputs: extracts data from connected nodes
+ * - validateWorkflow: checks workflow integrity
+ * - topological sort: ensures correct execution order
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { act } from "@testing-library/react";
+import { useWorkflowStore } from "../workflowStore";
+import type { WorkflowNode, WorkflowEdge } from "@/types";
+
+// Mock the Toast hook
+vi.mock("@/components/Toast", () => ({
+  useToast: {
+    getState: () => ({
+      show: vi.fn(),
+    }),
+  },
+}));
+
+// Mock the logger
+vi.mock("@/utils/logger", () => ({
+  logger: {
+    info: vi.fn(),
+    warn: vi.fn(),
+    error: vi.fn(),
+    startSession: vi.fn().mockResolvedValue(undefined),
+    endSession: vi.fn().mockResolvedValue(undefined),
+    getCurrentSession: vi.fn().mockReturnValue(null),
+  },
+}));
+
+// Mock localStorage for provider settings
+const mockLocalStorage: Record<string, string> = {};
+vi.stubGlobal("localStorage", {
+  getItem: vi.fn((key: string) => mockLocalStorage[key] || null),
+  setItem: vi.fn((key: string, value: string) => {
+    mockLocalStorage[key] = value;
+  }),
+  removeItem: vi.fn((key: string) => {
+    delete mockLocalStorage[key];
+  }),
+  clear: vi.fn(() => {
+    Object.keys(mockLocalStorage).forEach((key) => delete mockLocalStorage[key]);
+  }),
+});
+
+// Helper to reset store state between tests
+function resetStore() {
+  const store = useWorkflowStore.getState();
+  store.clearWorkflow();
+}
+
+// Helper to create a test node
+function createTestNode(
+  id: string,
+  type: string,
+  data: Record<string, unknown> = {},
+  position = { x: 0, y: 0 }
+): WorkflowNode {
+  return {
+    id,
+    type: type as WorkflowNode["type"],
+    position,
+    data: data as WorkflowNode["data"],
+  };
+}
+
+// Helper to create a test edge
+function createTestEdge(
+  source: string,
+  target: string,
+  sourceHandle: string | null = null,
+  targetHandle: string | null = null,
+  hasPause = false
+): WorkflowEdge {
+  return {
+    id: `edge-${source}-${target}-${sourceHandle || "default"}-${targetHandle || "default"}`,
+    source,
+    target,
+    sourceHandle,
+    targetHandle,
+    data: hasPause ? { hasPause: true } : undefined,
+  };
+}
+
+describe("workflowStore integration tests", () => {
+  beforeEach(() => {
+    resetStore();
+    vi.clearAllMocks();
+  });
+
+  afterEach(() => {
+    resetStore();
+  });
+
+  describe("getConnectedInputs", () => {
+    describe("Basic data extraction scenarios", () => {
+      it("should extract image from imageInput node", () => {
+        const store = useWorkflowStore.getState();
+        const testImage = "data:image/png;base64,testImageData";
+
+        // Set up nodes and edges directly
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("imageInput-1", "imageInput", { image: testImage }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [createTestEdge("imageInput-1", "nanoBanana-1", "image", "image")],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(result.images).toContain(testImage);
+        expect(result.images).toHaveLength(1);
+      });
+
+      it("should extract image from annotation node (outputImage)", () => {
+        const store = useWorkflowStore.getState();
+        const testImage = "data:image/png;base64,annotatedImageData";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("annotation-1", "annotation", { outputImage: testImage }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [createTestEdge("annotation-1", "nanoBanana-1", "image", "image")],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(result.images).toContain(testImage);
+        expect(result.images).toHaveLength(1);
+      });
+
+      it("should extract image from nanoBanana node (outputImage)", () => {
+        const store = useWorkflowStore.getState();
+        const testImage = "data:image/png;base64,generatedImageData";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("nanoBanana-1", "nanoBanana", { outputImage: testImage }),
+            createTestNode("nanoBanana-2", "nanoBanana", {}),
+          ],
+          edges: [createTestEdge("nanoBanana-1", "nanoBanana-2", "image", "image")],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-2");
+
+        expect(result.images).toContain(testImage);
+        expect(result.images).toHaveLength(1);
+      });
+
+      it("should extract text from prompt node", () => {
+        const store = useWorkflowStore.getState();
+        const testPrompt = "A beautiful sunset over the ocean";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("prompt-1", "prompt", { prompt: testPrompt }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [createTestEdge("prompt-1", "nanoBanana-1", "text", "text")],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(result.text).toBe(testPrompt);
+      });
+
+      it("should extract text from llmGenerate node (outputText)", () => {
+        const store = useWorkflowStore.getState();
+        const testOutput = "Generated text from LLM";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("llmGenerate-1", "llmGenerate", { outputText: testOutput }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [createTestEdge("llmGenerate-1", "nanoBanana-1", "text", "text")],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(result.text).toBe(testOutput);
+      });
+    });
+
+    describe("Multiple connections", () => {
+      it("should collect multiple images from different sources", () => {
+        const store = useWorkflowStore.getState();
+        const testImage1 = "data:image/png;base64,image1Data";
+        const testImage2 = "data:image/png;base64,image2Data";
+        const testImage3 = "data:image/png;base64,image3Data";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("imageInput-1", "imageInput", { image: testImage1 }),
+            createTestNode("imageInput-2", "imageInput", { image: testImage2 }),
+            createTestNode("annotation-1", "annotation", { outputImage: testImage3 }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [
+            createTestEdge("imageInput-1", "nanoBanana-1", "image", "image"),
+            createTestEdge("imageInput-2", "nanoBanana-1", "image", "image"),
+            createTestEdge("annotation-1", "nanoBanana-1", "image", "image"),
+          ],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(result.images).toHaveLength(3);
+        expect(result.images).toContain(testImage1);
+        expect(result.images).toContain(testImage2);
+        expect(result.images).toContain(testImage3);
+      });
+
+      it("should use last connected text source (not array)", () => {
+        const store = useWorkflowStore.getState();
+        const prompt1 = "First prompt";
+        const prompt2 = "Second prompt";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("prompt-1", "prompt", { prompt: prompt1 }),
+            createTestNode("prompt-2", "prompt", { prompt: prompt2 }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [
+            createTestEdge("prompt-1", "nanoBanana-1", "text", "text"),
+            createTestEdge("prompt-2", "nanoBanana-1", "text", "text"),
+          ],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        // Should have text from one of the prompts (last one processed)
+        expect(result.text).toBe(prompt2);
+      });
+
+      it("should handle mix of image and text connections", () => {
+        const store = useWorkflowStore.getState();
+        const testImage = "data:image/png;base64,imageData";
+        const testPrompt = "Test prompt text";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("imageInput-1", "imageInput", { image: testImage }),
+            createTestNode("prompt-1", "prompt", { prompt: testPrompt }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [
+            createTestEdge("imageInput-1", "nanoBanana-1", "image", "image"),
+            createTestEdge("prompt-1", "nanoBanana-1", "text", "text"),
+          ],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(result.images).toContain(testImage);
+        expect(result.images).toHaveLength(1);
+        expect(result.text).toBe(testPrompt);
+      });
+    });
+
+    describe("Dynamic input mapping", () => {
+      it("should map handle IDs to schema names when inputSchema is present", () => {
+        const store = useWorkflowStore.getState();
+        const testImage = "data:image/png;base64,imageData";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("imageInput-1", "imageInput", { image: testImage }),
+            createTestNode("generateVideo-1", "generateVideo", {
+              inputSchema: [
+                { name: "image_url", type: "image", required: true, label: "Image" },
+              ],
+            }),
+          ],
+          edges: [createTestEdge("imageInput-1", "generateVideo-1", "image", "image")],
+        });
+
+        const result = store.getConnectedInputs("generateVideo-1");
+
+        expect(result.dynamicInputs).toHaveProperty("image_url");
+        expect(result.dynamicInputs.image_url).toBe(testImage);
+      });
+
+      it("should map multiple image handles to schema names", () => {
+        const store = useWorkflowStore.getState();
+        const testImage1 = "data:image/png;base64,firstFrame";
+        const testImage2 = "data:image/png;base64,lastFrame";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("imageInput-1", "imageInput", { image: testImage1 }),
+            createTestNode("imageInput-2", "imageInput", { image: testImage2 }),
+            createTestNode("generateVideo-1", "generateVideo", {
+              inputSchema: [
+                { name: "first_frame", type: "image", required: true, label: "First Frame" },
+                { name: "last_frame", type: "image", required: false, label: "Last Frame" },
+              ],
+            }),
+          ],
+          edges: [
+            createTestEdge("imageInput-1", "generateVideo-1", "image", "image-0"),
+            createTestEdge("imageInput-2", "generateVideo-1", "image", "image-1"),
+          ],
+        });
+
+        const result = store.getConnectedInputs("generateVideo-1");
+
+        expect(result.dynamicInputs).toHaveProperty("first_frame", testImage1);
+        expect(result.dynamicInputs).toHaveProperty("last_frame", testImage2);
+      });
+
+      it("should map multiple text handles to schema names", () => {
+        const store = useWorkflowStore.getState();
+        const prompt = "Create a video";
+        const negativePrompt = "No blur";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("prompt-1", "prompt", { prompt }),
+            createTestNode("prompt-2", "prompt", { prompt: negativePrompt }),
+            createTestNode("generateVideo-1", "generateVideo", {
+              inputSchema: [
+                { name: "prompt", type: "text", required: true, label: "Prompt" },
+                { name: "negative_prompt", type: "text", required: false, label: "Negative Prompt" },
+              ],
+            }),
+          ],
+          edges: [
+            createTestEdge("prompt-1", "generateVideo-1", "text", "text-0"),
+            createTestEdge("prompt-2", "generateVideo-1", "text", "text-1"),
+          ],
+        });
+
+        const result = store.getConnectedInputs("generateVideo-1");
+
+        expect(result.dynamicInputs).toHaveProperty("prompt", prompt);
+        expect(result.dynamicInputs).toHaveProperty("negative_prompt", negativePrompt);
+      });
+
+      it("should not populate dynamicInputs when no inputSchema present", () => {
+        const store = useWorkflowStore.getState();
+        const testImage = "data:image/png;base64,imageData";
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("imageInput-1", "imageInput", { image: testImage }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [createTestEdge("imageInput-1", "nanoBanana-1", "image", "image")],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(Object.keys(result.dynamicInputs)).toHaveLength(0);
+        // But images array should still be populated
+        expect(result.images).toContain(testImage);
+      });
+    });
+
+    describe("Edge cases", () => {
+      it("should return empty images array and null text when no connections", () => {
+        const store = useWorkflowStore.getState();
+
+        useWorkflowStore.setState({
+          nodes: [createTestNode("nanoBanana-1", "nanoBanana", {})],
+          edges: [],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(result.images).toEqual([]);
+        expect(result.text).toBeNull();
+        expect(result.dynamicInputs).toEqual({});
+      });
+
+      it("should handle source node with null output data", () => {
+        const store = useWorkflowStore.getState();
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("imageInput-1", "imageInput", { image: null }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [createTestEdge("imageInput-1", "nanoBanana-1", "image", "image")],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(result.images).toEqual([]);
+      });
+
+      it("should handle connection to non-existent source node", () => {
+        const store = useWorkflowStore.getState();
+
+        useWorkflowStore.setState({
+          nodes: [createTestNode("nanoBanana-1", "nanoBanana", {})],
+          edges: [createTestEdge("nonexistent-1", "nanoBanana-1", "image", "image")],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        expect(result.images).toEqual([]);
+        expect(result.text).toBeNull();
+      });
+
+      it("should treat empty string as no value (falsy check in getSourceOutput)", () => {
+        const store = useWorkflowStore.getState();
+
+        useWorkflowStore.setState({
+          nodes: [
+            createTestNode("prompt-1", "prompt", { prompt: "" }),
+            createTestNode("nanoBanana-1", "nanoBanana", {}),
+          ],
+          edges: [createTestEdge("prompt-1", "nanoBanana-1", "text", "text")],
+        });
+
+        const result = store.getConnectedInputs("nanoBanana-1");
+
+        // Empty string is treated as falsy/no value by getSourceOutput
+        expect(result.text).toBeNull();
+      });
+    });
+  });
+});