Removing RSpec matcher warning

Prior to this commit the specs included the following warning:

> WARNING: Using `expect { }.not_to raise_error(SpecificErrorClass)`
> risks false positives, since literally any other error would cause the
> expectation to pass, including those raised by Ruby
> (e.g. NoMethodError, NameError and ArgumentError), meaning the
> code you are intending to test may not even get reached. Instead
> consider using `expect { }.not_to raise_error` or `expect { }.to
> raise_error(DifferentSpecificErrorClass)`.

With this commit, we're removing that warning.

Less warnings, means less chatter.

Related to:

- #43

spec/models/iiif_print/derivative_attachment_spec.rb

@@ -15,23 +15,23 @@ module IiifPrint
         destination_name: 'txt'
       )
       # attempt save without required data; expect failure
-      expect { model.save! }.not_to raise_exception(ActiveRecord::RecordInvalid)
+      expect { model.save! }.not_to raise_exception
     end
 
     it "saves when all fields completely set" do
       model = described_class.create
       model.fileset_id = 'someid123'
       model.path = '/path/to/somefile'
       model.destination_name = 'txt'
-      expect { model.save! }.not_to raise_exception(ActiveRecord::RecordInvalid)
+      expect { model.save! }.not_to raise_exception
     end
 
     it "saves when only path, destination_name set" do
       model = described_class.create
       model.fileset_id = nil
       model.path = '/path/to/somefile'
       model.destination_name = 'txt'
-      expect { model.save! }.not_to raise_exception(ActiveRecord::RecordInvalid)
+      expect { model.save! }.not_to raise_exception
     end
   end
 end

spec/models/iiif_print/ingest_file_relation_spec.rb

@@ -36,14 +36,14 @@ def make_test_records
         file_path: '/path/to/this',
         derivative_path: '/path/to/that'
       )
-      expect { model.save! }.not_to raise_exception(ActiveRecord::RecordInvalid)
+      expect { model.save! }.not_to raise_exception
     end
 
     it "will save when all fields completely set" do
       model = described_class.create
       model.file_path = '/path/to/sourcefile.tiff'
       model.derivative_path = '/path/to/derived.jp2'
-      expect { model.save! }.not_to raise_exception(ActiveRecord::RecordInvalid)
+      expect { model.save! }.not_to raise_exception
     end
 
     it "can query derivative paths for primary file" do