test(deprecation): add deprecate util

Author: blond

test/deprecate.test.js

@@ -0,0 +1,32 @@
+const test = require('ava');
+const sinon = require('sinon');
+const proxyquire = require('proxyquire');
+
+const BemEntityName = require('../lib/entity-name');
+
+const deprecateSpy = sinon.spy();
+const deprecate = proxyquire('../lib/deprecate', {
+    'depd':() => deprecateSpy
+});
+
+test('should deprecate object', t => {
+    deprecate({ block: 'block' }, 'oldField', 'newField');
+
+    const message = [
+        "`oldField` is kept just for compatibility and can be dropped in the future.",
+        "Use `newField` instead in `{ block: 'block' }` at"
+    ].join(' ');
+
+    t.true(deprecateSpy.calledWith(message));
+});
+
+test('should deprecate BemEntityName instance', t => {
+    deprecate(new BemEntityName({ block: 'block' }), 'oldField', 'newField');
+
+    const message = [
+        "`oldField` is kept just for compatibility and can be dropped in the future.",
+        "Use `newField` instead in `BemEntityName { block: 'block' }` at"
+    ].join(' ');
+
+    t.true(deprecateSpy.calledWith(message));
+});