chore: import upstream snapshot with attribution

apps/sim/stores/workflow-diff/utils.test.ts

@@ -0,0 +1,77 @@
+/**
+ * @vitest-environment node
+ */
+import { beforeEach, describe, expect, it } from 'vitest'
+import { useVariablesStore } from '@/stores/variables/store'
+import { applyWorkflowVariablesToStore } from '@/stores/workflow-diff/utils'
+
+describe('applyWorkflowVariablesToStore', () => {
+  beforeEach(() => {
+    useVariablesStore.setState({
+      variables: {},
+      isLoading: false,
+      error: null,
+      isEditing: null,
+    })
+  })
+
+  it('hydrates variables for the target workflow and preserves other workflows', () => {
+    useVariablesStore.setState({
+      variables: {
+        old: {
+          id: 'old',
+          workflowId: 'workflow-a',
+          name: 'oldValue',
+          type: 'plain',
+          value: 'stale',
+        },
+        other: {
+          id: 'other',
+          workflowId: 'workflow-b',
+          name: 'otherValue',
+          type: 'plain',
+          value: 'kept',
+        },
+      },
+    })
+
+    applyWorkflowVariablesToStore('workflow-a', {
+      next: {
+        id: 'next',
+        name: 'nextValue',
+        type: 'number',
+        value: 42,
+      },
+    })
+
+    expect(useVariablesStore.getState().variables).toEqual({
+      other: {
+        id: 'other',
+        workflowId: 'workflow-b',
+        name: 'otherValue',
+        type: 'plain',
+        value: 'kept',
+      },
+      next: {
+        id: 'next',
+        workflowId: 'workflow-a',
+        name: 'nextValue',
+        type: 'number',
+        value: 42,
+      },
+    })
+  })
+
+  it('preserves null variable values from persisted workflow state', () => {
+    applyWorkflowVariablesToStore('workflow-a', {
+      next: {
+        id: 'next',
+        name: 'nullableValue',
+        type: 'object',
+        value: null,
+      },
+    })
+
+    expect(useVariablesStore.getState().variables.next.value).toBeNull()
+  })
+})