5043 Move ELK to standalone package

packages/mermaid-flowchart-elk/src/render-utils.spec.ts

@@ -0,0 +1,41 @@
+import type { TreeData } from './render-utils.js';
+import { findCommonAncestor } from './render-utils.js';
+describe('when rendering a flowchart using elk ', () => {
+  let lookupDb: TreeData;
+  beforeEach(() => {
+    lookupDb = {
+      parentById: {
+        B4: 'inner',
+        B5: 'inner',
+        C4: 'inner2',
+        C5: 'inner2',
+        B2: 'Ugge',
+        B3: 'Ugge',
+        inner: 'Ugge',
+        inner2: 'Ugge',
+        B6: 'outer',
+      },
+      childrenById: {
+        inner: ['B4', 'B5'],
+        inner2: ['C4', 'C5'],
+        Ugge: ['B2', 'B3', 'inner', 'inner2'],
+        outer: ['B6'],
+      },
+    };
+  });
+  it('to find parent of siblings in a subgraph', () => {
+    expect(findCommonAncestor('B4', 'B5', lookupDb)).toBe('inner');
+  });
+  it('to find an uncle', () => {
+    expect(findCommonAncestor('B4', 'B2', lookupDb)).toBe('Ugge');
+  });
+  it('to find a cousin', () => {
+    expect(findCommonAncestor('B4', 'C4', lookupDb)).toBe('Ugge');
+  });
+  it('to find a grandparent', () => {
+    expect(findCommonAncestor('B4', 'B6', lookupDb)).toBe('root');
+  });
+  it('to find ancestor of siblings in the root', () => {
+    expect(findCommonAncestor('B1', 'outer', lookupDb)).toBe('root');
+  });
+});