test: tsify callbacks-registry spec (#19606)

spec-main/api-callbacks-registry-spec.ts

@@ -0,0 +1,44 @@
+import { expect } from 'chai'
+import { CallbacksRegistry } from '../lib/renderer/callbacks-registry'
+
+describe('CallbacksRegistry module', () => {
+  let registry: CallbacksRegistry
+
+  beforeEach(() => {
+    registry = new CallbacksRegistry()
+  })
+
+  it('adds a callback to the registry', () => {
+    const cb = () => [1, 2, 3, 4, 5]
+    const key = registry.add(cb)
+
+    expect(key).to.exist('key')
+  })
+
+  it('returns a specified callback if it is in the registry', () => {
+    const cb = () => [1, 2, 3, 4, 5]
+    const key = registry.add(cb)
+    expect(key).to.exist('key')
+    const callback = registry.get(key!)
+
+    expect(callback.toString()).equal(cb.toString())
+  })
+
+  it('returns an empty function if the cb doesnt exist', () => {
+    const callback = registry.get(1)
+
+    expect(callback).to.be.a('function')
+  })
+
+  it('removes a callback to the registry', () => {
+    const cb = () => [1, 2, 3, 4, 5]
+    const key = registry.add(cb)
+    expect(key).to.exist('key')
+
+    registry.remove(key!)
+    const afterCB = registry.get(key!)
+
+    expect(afterCB).to.be.a('function')
+    expect(afterCB.toString()).to.not.equal(cb.toString())
+  })
+})