1 files changed, 69 insertions, 0 deletions
diff --git a/spec/validators/array_members_validator_spec.rb b/spec/validators/array_members_validator_spec.rb
new file mode 100644
index 00000000000..ff8f0da7651
--- /dev/null
+++ b/spec/validators/array_members_validator_spec.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe ArrayMembersValidator do
+  using RSpec::Parameterized::TableSyntax
+
+  child_class = Class.new
+
+  subject(:test_class) do
+    Class.new do
+      include ActiveModel::Model
+      include ActiveModel::Validations
+      attr_accessor :children
+      validates :children, array_members: { member_class: child_class }
+    end
+  end
+
+  where(:children, :is_valid) do
+    [child_class.new]                | true
+    [Class.new.new]                  | false
+    [child_class.new, Class.new.new] | false
+    []                               | false
+    child_class.new                  | false
+    [Class.new(child_class).new]     | false
+  end
+
+  with_them do
+    it 'only accepts valid children nodes' do
+      expect(test_class.new(children: children).valid?).to eq(is_valid)
+    end
+  end
+
+  context 'validation message' do
+    subject(:test_class) do
+      Class.new do
+        include ActiveModel::Model
+        include ActiveModel::Validations
+        attr_accessor :children
+      end
+    end
+
+    context 'with default object name' do
+      it 'uses attribute name', :aggregate_failures do
+        test_class.class_eval do
+          validates :children, array_members: { member_class: child_class }
+        end
+
+        object = test_class.new(children: [])
+
+        expect(object.valid?).to be_falsey
+        expect(object.errors.messages).to eql(children: ['should be an array of children objects'])
+      end
+    end
+
+    context 'with custom object name' do
+      it 'uses that name', :aggregate_failures do
+        test_class.class_eval do
+          validates :children, array_members: { member_class: child_class, object_name: 'test' }
+        end
+
+        object = test_class.new(children: [])
+
+        expect(object.valid?).to be_falsey
+        expect(object.errors.messages).to eql(children: ['should be an array of test objects'])
+      end
+    end
+  end
+end