test: add tests for deprecate.property()

spec/api-deprecations-spec.js

@@ -49,6 +49,30 @@ describe('deprecations', () => {
     assert.equal(typeof nativeImage.createFromDataUrl, 'function')
   })
 
+  it('renames a property', () => {
+    let msg
+    deprecations.setHandler((m) => { msg = m })
+
+    const oldPropertyName = 'dingyOldName'
+    const newPropertyName = 'shinyNewName'
+
+    let value = 0
+    let o = { [newPropertyName]: value }
+    assert.strictEqual(typeof o[oldPropertyName], 'undefined')
+    assert.strictEqual(typeof o[newPropertyName], 'number')
+
+    deprecate.property(o, oldPropertyName, newPropertyName)
+    assert.notEqual(typeof msg, 'string')
+    o[oldPropertyName] = ++value
+
+    assert.strictEqual(typeof msg, 'string')
+    assert.ok(msg.includes(oldPropertyName))
+    assert.ok(msg.includes(newPropertyName))
+
+    assert.strictEqual(o[newPropertyName], value)
+    assert.strictEqual(o[oldPropertyName], value)
+  })
+
   it('throws an exception if no deprecation handler is specified', () => {
     assert.throws(() => {
       deprecate.log('this is deprecated')