raise error on bad data - bump version to 5.0.1

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 5.0.1
+
+- Raise ArgumentError data is not a string or StringIO object
+
 ## 5.0.0
 
 - Refactor the Column class to support non-ASCII header names

lib/dbf/table.rb

@@ -308,7 +308,14 @@ def memo_search_path(io) # :nodoc:
     end
 
     def open_data(data) # :nodoc:
-      data.is_a?(StringIO) ? data : File.open(data, 'rb')
+      case data
+      when StringIO
+        data
+      when String
+        File.open(data, 'rb')
+      else
+        raise ArgumentError, 'data must be a file path or StringIO object'
+      end
     rescue Errno::ENOENT
       raise DBF::FileNotFoundError, "file not found: #{data}"
     end

lib/dbf/version.rb

@@ -1,3 +1,3 @@
 module DBF
-  VERSION = '5.0.0'.freeze
+  VERSION = '5.0.1'.freeze
 end

spec/dbf/table_spec.rb

@@ -29,6 +29,12 @@
       end
     end
 
+    describe 'when data is nil' do
+      it 'raises ArgumentError' do
+        expect { DBF::Table.new nil }.to raise_error(ArgumentError, 'data must be a file path or StringIO object')
+      end
+    end
+
     describe 'when given paths to existing dbf and memo files' do
       it 'does not raise an error' do
         expect { DBF::Table.new dbf_path, memo_path }.to_not raise_error