Add document model validations and model shared specs.

spec/shared/models/document_validations.rb

@@ -0,0 +1,52 @@
+shared_examples "document validations" do |documentable_factory|
+
+  let(:document) { build(:document, documentable_factory.to_sym) }
+
+  it "should be valid" do
+    expect(document).to be_valid
+  end
+
+  it "should not be valid without a title" do
+    document.title = nil
+
+    expect(document).to_not be_valid
+  end
+
+  it "should not be valid without an attachment" do
+    document.attachment = nil
+
+    expect(document).to_not be_valid
+  end
+
+  it "should not be valid for attachment images" do
+    document.attachment = File.new("spec/fixtures/files/logo_header.png")
+
+    expect(document).to_not be_valid
+  end
+
+  it "should not be valid for attachment 3MB" do
+    document.stub(:attachment_file_size).and_return(3.1.megabytes)
+
+    document.should_not be_valid
+    expect(document.errors[:attachment]).to include "must be in between 0 Bytes and 3 MB"
+  end
+
+  it "should not be valid without a user_id" do
+    document.user_id = nil
+
+    expect(document).to_not be_valid
+  end
+
+  it "should not be valid without a documentable_id" do
+    document.documentable_id = nil
+
+    expect(document).to_not be_valid
+  end
+
+  it "should not be valid without a documentable_type" do
+    document.documentable_type = nil
+
+    expect(document).to_not be_valid
+  end
+
+end