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/stores/nodeDefStore.test.ts

@@ -0,0 +1,309 @@
+import { createPinia, setActivePinia } from 'pinia'
+import { beforeEach, describe, expect, it } from 'vitest'
+
+import type { ComfyNodeDef } from '@/schemas/nodeDefSchema'
+import { useNodeDefStore } from '@/stores/nodeDefStore'
+import type { NodeDefFilter } from '@/stores/nodeDefStore'
+
+describe('useNodeDefStore', () => {
+  let store: ReturnType<typeof useNodeDefStore>
+
+  beforeEach(() => {
+    setActivePinia(createPinia())
+    store = useNodeDefStore()
+  })
+
+  const createMockNodeDef = (
+    overrides: Partial<ComfyNodeDef> = {}
+  ): ComfyNodeDef => ({
+    name: 'TestNode',
+    display_name: 'Test Node',
+    category: 'test',
+    python_module: 'test_module',
+    description: 'Test node',
+    input: {},
+    output: [],
+    output_is_list: [],
+    output_name: [],
+    output_node: false,
+    deprecated: false,
+    experimental: false,
+    ...overrides
+  })
+
+  describe('filter registry', () => {
+    it('should register a new filter', () => {
+      const filter: NodeDefFilter = {
+        id: 'test.filter',
+        name: 'Test Filter',
+        predicate: () => true
+      }
+
+      store.registerNodeDefFilter(filter)
+      expect(store.nodeDefFilters).toContainEqual(filter)
+    })
+
+    it('should unregister a filter by id', () => {
+      const filter: NodeDefFilter = {
+        id: 'test.filter',
+        name: 'Test Filter',
+        predicate: () => true
+      }
+
+      store.registerNodeDefFilter(filter)
+      store.unregisterNodeDefFilter('test.filter')
+      expect(store.nodeDefFilters).not.toContainEqual(filter)
+    })
+
+    it('should register core filters on initialization', () => {
+      const deprecatedFilter = store.nodeDefFilters.find(
+        (f) => f.id === 'core.deprecated'
+      )
+      const experimentalFilter = store.nodeDefFilters.find(
+        (f) => f.id === 'core.experimental'
+      )
+
+      expect(deprecatedFilter).toBeDefined()
+      expect(experimentalFilter).toBeDefined()
+    })
+  })
+
+  describe('filter application', () => {
+    beforeEach(() => {
+      // Clear existing filters for isolated tests
+      store.nodeDefFilters.splice(0)
+    })
+
+    it('should apply single filter to visible nodes', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        deprecated: false
+      })
+      const deprecatedNode = createMockNodeDef({
+        name: 'deprecated',
+        deprecated: true
+      })
+
+      store.updateNodeDefs([normalNode, deprecatedNode])
+
+      // Register filter that hides deprecated nodes
+      store.registerNodeDefFilter({
+        id: 'test.no-deprecated',
+        name: 'Hide Deprecated',
+        predicate: (node) => !node.deprecated
+      })
+
+      expect(store.visibleNodeDefs).toHaveLength(1)
+      expect(store.visibleNodeDefs[0].name).toBe('normal')
+    })
+
+    it('should apply multiple filters with AND logic', () => {
+      const node1 = createMockNodeDef({
+        name: 'node1',
+        deprecated: false,
+        experimental: false
+      })
+      const node2 = createMockNodeDef({
+        name: 'node2',
+        deprecated: true,
+        experimental: false
+      })
+      const node3 = createMockNodeDef({
+        name: 'node3',
+        deprecated: false,
+        experimental: true
+      })
+      const node4 = createMockNodeDef({
+        name: 'node4',
+        deprecated: true,
+        experimental: true
+      })
+
+      store.updateNodeDefs([node1, node2, node3, node4])
+
+      // Register filters
+      store.registerNodeDefFilter({
+        id: 'test.no-deprecated',
+        name: 'Hide Deprecated',
+        predicate: (node) => !node.deprecated
+      })
+
+      store.registerNodeDefFilter({
+        id: 'test.no-experimental',
+        name: 'Hide Experimental',
+        predicate: (node) => !node.experimental
+      })
+
+      // Only node1 should be visible (not deprecated AND not experimental)
+      expect(store.visibleNodeDefs).toHaveLength(1)
+      expect(store.visibleNodeDefs[0].name).toBe('node1')
+    })
+
+    it('should show all nodes when no filters are registered', () => {
+      const nodes = [
+        createMockNodeDef({ name: 'node1' }),
+        createMockNodeDef({ name: 'node2' }),
+        createMockNodeDef({ name: 'node3' })
+      ]
+
+      store.updateNodeDefs(nodes)
+      expect(store.visibleNodeDefs).toHaveLength(3)
+    })
+
+    it('should update visibility when filter is removed', () => {
+      const deprecatedNode = createMockNodeDef({
+        name: 'deprecated',
+        deprecated: true
+      })
+      store.updateNodeDefs([deprecatedNode])
+
+      const filter: NodeDefFilter = {
+        id: 'test.no-deprecated',
+        name: 'Hide Deprecated',
+        predicate: (node) => !node.deprecated
+      }
+
+      // Add filter - node should be hidden
+      store.registerNodeDefFilter(filter)
+      expect(store.visibleNodeDefs).toHaveLength(0)
+
+      // Remove filter - node should be visible
+      store.unregisterNodeDefFilter('test.no-deprecated')
+      expect(store.visibleNodeDefs).toHaveLength(1)
+    })
+  })
+
+  describe('core filters behavior', () => {
+    it('should hide deprecated nodes by default', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        deprecated: false
+      })
+      const deprecatedNode = createMockNodeDef({
+        name: 'deprecated',
+        deprecated: true
+      })
+
+      store.updateNodeDefs([normalNode, deprecatedNode])
+
+      expect(store.visibleNodeDefs).toHaveLength(1)
+      expect(store.visibleNodeDefs[0].name).toBe('normal')
+    })
+
+    it('should show deprecated nodes when showDeprecated is true', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        deprecated: false
+      })
+      const deprecatedNode = createMockNodeDef({
+        name: 'deprecated',
+        deprecated: true
+      })
+
+      store.updateNodeDefs([normalNode, deprecatedNode])
+      store.showDeprecated = true
+
+      expect(store.visibleNodeDefs).toHaveLength(2)
+    })
+
+    it('should hide experimental nodes by default', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        experimental: false
+      })
+      const experimentalNode = createMockNodeDef({
+        name: 'experimental',
+        experimental: true
+      })
+
+      store.updateNodeDefs([normalNode, experimentalNode])
+
+      expect(store.visibleNodeDefs).toHaveLength(1)
+      expect(store.visibleNodeDefs[0].name).toBe('normal')
+    })
+
+    it('should show experimental nodes when showExperimental is true', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        experimental: false
+      })
+      const experimentalNode = createMockNodeDef({
+        name: 'experimental',
+        experimental: true
+      })
+
+      store.updateNodeDefs([normalNode, experimentalNode])
+      store.showExperimental = true
+
+      expect(store.visibleNodeDefs).toHaveLength(2)
+    })
+
+    it('should hide subgraph nodes by default', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        category: 'conditioning',
+        python_module: 'nodes'
+      })
+      const subgraphNode = createMockNodeDef({
+        name: 'MySubgraph',
+        category: 'subgraph',
+        python_module: 'nodes'
+      })
+
+      store.updateNodeDefs([normalNode, subgraphNode])
+
+      expect(store.visibleNodeDefs).toHaveLength(1)
+      expect(store.visibleNodeDefs[0].name).toBe('normal')
+    })
+
+    it('should show non-subgraph nodes with subgraph category', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        category: 'conditioning',
+        python_module: 'custom_extension'
+      })
+      const fakeSubgraphNode = createMockNodeDef({
+        name: 'FakeSubgraph',
+        category: 'subgraph',
+        python_module: 'custom_extension' // Different python_module
+      })
+
+      store.updateNodeDefs([normalNode, fakeSubgraphNode])
+
+      expect(store.visibleNodeDefs).toHaveLength(2)
+      expect(store.visibleNodeDefs.map((n) => n.name)).toEqual([
+        'normal',
+        'FakeSubgraph'
+      ])
+    })
+  })
+
+  describe('performance', () => {
+    it('should perform single traversal for multiple filters', () => {
+      let filterCallCount = 0
+
+      // Register multiple filters that count their calls
+      for (let i = 0; i < 5; i++) {
+        store.registerNodeDefFilter({
+          id: `test.counter-${i}`,
+          name: `Counter ${i}`,
+          predicate: () => {
+            filterCallCount++
+            return true
+          }
+        })
+      }
+
+      const nodes = Array.from({ length: 10 }, (_, i) =>
+        createMockNodeDef({ name: `node${i}` })
+      )
+      store.updateNodeDefs(nodes)
+
+      // Force recomputation by accessing visibleNodeDefs
+      expect(store.visibleNodeDefs).toBeDefined()
+
+      // Each node (10) should be checked by each filter (5 test + 2 core = 7 total)
+      expect(filterCallCount).toBe(10 * 5)
+    })
+  })
+})