first commit

packages/workflow/test/common.test.ts

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+import type { IConnections, IConnection } from '../src/interfaces';
+import { NodeConnectionTypes } from '../src/interfaces';
+import { mapConnectionsByDestination } from '../src/common';
+
+describe('getConnectionsByDestination', () => {
+	it('should return empty object when there are no connections', () => {
+		const result = mapConnectionsByDestination({});
+
+		expect(result).toEqual({});
+	});
+
+	it('should return connections by destination node', () => {
+		const connections: IConnections = {
+			Node1: {
+				[NodeConnectionTypes.Main]: [
+					[
+						{ node: 'Node2', type: NodeConnectionTypes.Main, index: 0 },
+						{ node: 'Node3', type: NodeConnectionTypes.Main, index: 1 },
+					],
+				],
+			},
+		};
+		const result = mapConnectionsByDestination(connections);
+		expect(result).toEqual({
+			Node2: {
+				[NodeConnectionTypes.Main]: [[{ node: 'Node1', type: NodeConnectionTypes.Main, index: 0 }]],
+			},
+			Node3: {
+				[NodeConnectionTypes.Main]: [
+					[],
+					[{ node: 'Node1', type: NodeConnectionTypes.Main, index: 0 }],
+				],
+			},
+		});
+	});
+
+	it('should handle multiple connection types', () => {
+		const connections: IConnections = {
+			Node1: {
+				[NodeConnectionTypes.Main]: [[{ node: 'Node2', type: NodeConnectionTypes.Main, index: 0 }]],
+				[NodeConnectionTypes.AiAgent]: [
+					[{ node: 'Node3', type: NodeConnectionTypes.AiAgent, index: 0 }],
+				],
+			},
+		};
+
+		const result = mapConnectionsByDestination(connections);
+		expect(result).toEqual({
+			Node2: {
+				[NodeConnectionTypes.Main]: [[{ node: 'Node1', type: NodeConnectionTypes.Main, index: 0 }]],
+			},
+			Node3: {
+				[NodeConnectionTypes.AiAgent]: [
+					[{ node: 'Node1', type: NodeConnectionTypes.AiAgent, index: 0 }],
+				],
+			},
+		});
+	});
+
+	it('should handle nodes with no connections', () => {
+		const connections: IConnections = {
+			Node1: {
+				[NodeConnectionTypes.Main]: [[]],
+			},
+		};
+
+		const result = mapConnectionsByDestination(connections);
+		expect(result).toEqual({});
+	});
+
+	// @issue https://linear.app/n8n/issue/N8N-7880/cannot-load-some-templates
+	it('should handle nodes with null connections', () => {
+		const connections: IConnections = {
+			Node1: {
+				[NodeConnectionTypes.Main]: [
+					null as unknown as IConnection[],
+					[{ node: 'Node2', type: NodeConnectionTypes.Main, index: 0 }],
+				],
+			},
+		};
+
+		const result = mapConnectionsByDestination(connections);
+		expect(result).toEqual({
+			Node2: {
+				[NodeConnectionTypes.Main]: [[{ node: 'Node1', type: NodeConnectionTypes.Main, index: 1 }]],
+			},
+		});
+	});
+
+	it('should handle nodes with multiple input connections', () => {
+		const connections: IConnections = {
+			Node1: {
+				[NodeConnectionTypes.Main]: [[{ node: 'Node2', type: NodeConnectionTypes.Main, index: 0 }]],
+			},
+			Node3: {
+				[NodeConnectionTypes.Main]: [[{ node: 'Node2', type: NodeConnectionTypes.Main, index: 0 }]],
+			},
+		};
+
+		const result = mapConnectionsByDestination(connections);
+		expect(result).toEqual({
+			Node2: {
+				[NodeConnectionTypes.Main]: [
+					[
+						{ node: 'Node1', type: NodeConnectionTypes.Main, index: 0 },
+						{ node: 'Node3', type: NodeConnectionTypes.Main, index: 0 },
+					],
+				],
+			},
+		});
+	});
+});