test(valid): should throw if modifier is not valid

Author: blond

test/throws.test.js

@@ -0,0 +1,31 @@
+const test = require('ava');
+
+const BemEntityName = require('../index');
+
+test('should throw error for if entity object is not valid', t => {
+    t.throws(
+        () => new BemEntityName({ elem: 'elem' }),
+        'This is not valid BEM entity: the field `block` is undefined.'
+    );
+});
+
+test('should throw error for if mod object is empty', t => {
+    t.throws(
+        () => new BemEntityName({ block: 'block', mod: {} }),
+        'This is not valid BEM entity: the field `mod.name` is undefined.'
+    );
+});
+
+test('should throw error for if mod name is undefined', t => {
+    t.throws(
+        () => new BemEntityName({ block: 'block', mod: { val: 'val' } }),
+        'This is not valid BEM entity: the field `mod.name` is undefined.'
+    );
+});
+
+test('should throw error for if modName is undefined', t => {
+    t.throws(
+        () => new BemEntityName({ block: 'block', modVal: 'val' }),
+        'This is not valid BEM entity: the field `mod.name` is undefined.'
+    );
+});