chore: migrate tests from tests-ui/ to colocate with source files (#7811)

## Summary

Migrates all unit tests from `tests-ui/` to colocate with their source
files in `src/`, improving discoverability and maintainability.

## Changes

- **What**: Relocated all unit tests to be adjacent to the code they
test, following the `<source>.test.ts` naming convention
- **Config**: Updated `vitest.config.ts` to remove `tests-ui` include
pattern and `@tests-ui` alias
- **Docs**: Moved testing documentation to `docs/testing/` with updated
paths and patterns

## Review Focus

- Migration patterns documented in
`temp/plans/migrate-tests-ui-to-src.md`
- Tests use `@/` path aliases instead of relative imports
- Shared fixtures placed in `__fixtures__/` directories

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7811-chore-migrate-tests-from-tests-ui-to-colocate-with-source-files-2da6d73d36508147a4cce85365dee614)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: GitHub Action <action@github.com>

src/renderer/extensions/minimap/data/MinimapDataSource.test.ts

@@ -0,0 +1,175 @@
+import { describe, expect, it, vi } from 'vitest'
+import { computed } from 'vue'
+import type { ComputedRef } from 'vue'
+
+import type { NodeId } from '@/lib/litegraph/src/LGraphNode'
+import type { LGraph, LGraphNode, LLink } from '@/lib/litegraph/src/litegraph'
+import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
+import type { NodeLayout } from '@/renderer/core/layout/types'
+import { MinimapDataSourceFactory } from '@/renderer/extensions/minimap/data/MinimapDataSourceFactory'
+
+// Mock layoutStore
+vi.mock('@/renderer/core/layout/store/layoutStore', () => ({
+  layoutStore: {
+    getAllNodes: vi.fn()
+  }
+}))
+
+// Helper to create mock links that satisfy LGraph['links'] type
+function createMockLinks(): LGraph['links'] {
+  const map = new Map<number, LLink>()
+  return Object.assign(map, {}) as LGraph['links']
+}
+
+describe('MinimapDataSource', () => {
+  describe('MinimapDataSourceFactory', () => {
+    it('should create LayoutStoreDataSource when LayoutStore has data', () => {
+      // Arrange
+      const mockNodes = new Map<string, NodeLayout>([
+        [
+          'node1',
+          {
+            id: 'node1',
+            position: { x: 0, y: 0 },
+            size: { width: 100, height: 50 },
+            zIndex: 0,
+            visible: true,
+            bounds: { x: 0, y: 0, width: 100, height: 50 }
+          }
+        ]
+      ])
+
+      // Create a computed ref that returns the map
+      const computedNodes: ComputedRef<ReadonlyMap<string, NodeLayout>> =
+        computed(() => mockNodes)
+      vi.mocked(layoutStore.getAllNodes).mockReturnValue(computedNodes)
+
+      const mockGraph: Pick<LGraph, '_nodes' | '_groups' | 'links'> = {
+        _nodes: [],
+        _groups: [],
+        links: createMockLinks()
+      }
+
+      // Act
+      const dataSource = MinimapDataSourceFactory.create(mockGraph as LGraph)
+
+      // Assert
+      expect(dataSource).toBeDefined()
+      expect(dataSource.hasData()).toBe(true)
+      expect(dataSource.getNodeCount()).toBe(1)
+    })
+
+    it('should create LiteGraphDataSource when LayoutStore is empty', () => {
+      // Arrange
+      const emptyMap = new Map<string, NodeLayout>()
+      const computedEmpty: ComputedRef<ReadonlyMap<string, NodeLayout>> =
+        computed(() => emptyMap)
+      vi.mocked(layoutStore.getAllNodes).mockReturnValue(computedEmpty)
+
+      const mockNode: Pick<
+        LGraphNode,
+        'id' | 'pos' | 'size' | 'bgcolor' | 'mode' | 'has_errors' | 'outputs'
+      > = {
+        id: 'node1' as NodeId,
+        pos: [0, 0],
+        size: [100, 50],
+        bgcolor: '#fff',
+        mode: 0,
+        has_errors: false,
+        outputs: []
+      }
+
+      const mockGraph: Pick<LGraph, '_nodes' | '_groups' | 'links'> = {
+        _nodes: [mockNode as LGraphNode],
+        _groups: [],
+        links: createMockLinks()
+      }
+
+      // Act
+      const dataSource = MinimapDataSourceFactory.create(mockGraph as LGraph)
+
+      // Assert
+      expect(dataSource).toBeDefined()
+      expect(dataSource.hasData()).toBe(true)
+      expect(dataSource.getNodeCount()).toBe(1)
+
+      const nodes = dataSource.getNodes()
+      expect(nodes).toHaveLength(1)
+      expect(nodes[0]).toMatchObject({
+        id: 'node1',
+        x: 0,
+        y: 0,
+        width: 100,
+        height: 50
+      })
+    })
+
+    it('should handle empty graph correctly', () => {
+      // Arrange
+      const emptyMap = new Map<string, NodeLayout>()
+      const computedEmpty: ComputedRef<ReadonlyMap<string, NodeLayout>> =
+        computed(() => emptyMap)
+      vi.mocked(layoutStore.getAllNodes).mockReturnValue(computedEmpty)
+
+      const mockGraph: Pick<LGraph, '_nodes' | '_groups' | 'links'> = {
+        _nodes: [],
+        _groups: [],
+        links: createMockLinks()
+      }
+
+      // Act
+      const dataSource = MinimapDataSourceFactory.create(mockGraph as LGraph)
+
+      // Assert
+      expect(dataSource.hasData()).toBe(false)
+      expect(dataSource.getNodeCount()).toBe(0)
+      expect(dataSource.getNodes()).toEqual([])
+      expect(dataSource.getLinks()).toEqual([])
+      expect(dataSource.getGroups()).toEqual([])
+    })
+  })
+
+  describe('Bounds calculation', () => {
+    it('should calculate correct bounds from nodes', () => {
+      // Arrange
+      const emptyMap = new Map<string, NodeLayout>()
+      const computedEmpty: ComputedRef<ReadonlyMap<string, NodeLayout>> =
+        computed(() => emptyMap)
+      vi.mocked(layoutStore.getAllNodes).mockReturnValue(computedEmpty)
+
+      const mockNode1: Pick<LGraphNode, 'id' | 'pos' | 'size' | 'outputs'> = {
+        id: 'node1' as NodeId,
+        pos: [0, 0],
+        size: [100, 50],
+        outputs: []
+      }
+
+      const mockNode2: Pick<LGraphNode, 'id' | 'pos' | 'size' | 'outputs'> = {
+        id: 'node2' as NodeId,
+        pos: [200, 100],
+        size: [150, 75],
+        outputs: []
+      }
+
+      const mockGraph: Pick<LGraph, '_nodes' | '_groups' | 'links'> = {
+        _nodes: [mockNode1 as LGraphNode, mockNode2 as LGraphNode],
+        _groups: [],
+        links: createMockLinks()
+      }
+
+      // Act
+      const dataSource = MinimapDataSourceFactory.create(mockGraph as LGraph)
+      const bounds = dataSource.getBounds()
+
+      // Assert
+      expect(bounds).toEqual({
+        minX: 0,
+        minY: 0,
+        maxX: 350,
+        maxY: 175,
+        width: 350,
+        height: 175
+      })
+    })
+  })
+})