test(isBemEntityName): add isBemEntityName method

Author: blond

test/is-bem-entity-name.test.js

@@ -0,0 +1,17 @@
+const test = require('ava');
+
+const BemEntityName = require('../index');
+
+test('should check valid entities', t => {
+    const entityName = new BemEntityName({ block: 'block' });
+
+    t.true(BemEntityName.isBemEntityName(entityName));
+});
+
+test('should not pass invalid blocks', t => {
+    t.falsy(BemEntityName.isBemEntityName(new Array()));
+});
+
+test('should not pass null', t => {
+    t.falsy(BemEntityName.isBemEntityName(null));
+});