Add arguments to documentable concern to make it configurable for any recipient model.

spec/shared/models/document_validations.rb

@@ -1,6 +1,8 @@
 shared_examples "document validations" do |documentable_factory|
 
-  let(:document) { build(:document, documentable_factory.to_sym) }
+  let(:document)      { build(:document, documentable_factory.to_sym) }
+  let(:max_file_size) { document.documentable.class.max_file_size }
+  let(:accepted_content_types) { document.documentable.class.accepted_content_types }
 
   it "should be valid" do
     expect(document).to be_valid
@@ -18,17 +20,20 @@ shared_examples "document validations" do |documentable_factory|
     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")
+  it "should be valid for all accepted content types" do
+    accepted_content_types.each do |content_type|
+      extension = content_type.split("/").last
+      document.attachment = File.new("spec/fixtures/files/empty.#{extension}")
 
-    expect(document).to_not be_valid
+      expect(document).to be_valid
+    end
   end
 
-  it "should not be valid for attachment 3MB" do
-    document.stub(:attachment_file_size).and_return(3.1.megabytes)
+  it "should not be valid for attachments larger than documentable max_file_size definition" do
+    document.stub(:attachment_file_size).and_return(max_file_size.bytes + 1.byte)
 
-    document.should_not be_valid
-    expect(document.errors[:attachment]).to include "must be in between 0 Bytes and 3 MB"
+    expect(document).to_not be_valid
+    expect(document.errors[:attachment]).to include "must be in between 0 Bytes and #{bytesToMeg(max_file_size)} MB"
   end
 
   it "should not be valid without a user_id" do
@@ -50,3 +55,7 @@ shared_examples "document validations" do |documentable_factory|
   end
 
 end
+
+def bytesToMeg(bytes)
+  bytes / (1024.0 * 1024.0)
+end