Add support for single digit version strings, closes shakacode#489

lib/react_on_rails/version_checker.rb

@@ -3,6 +3,7 @@ module ReactOnRails
   # against each otherat runtime.
   class VersionChecker
     attr_reader :node_package_version, :logger
+    MAJOR_VERSION_REGEX = /(\d+)\.?/
 
     def self.build
       new(NodePackageVersion.build, Rails.logger)
@@ -38,7 +39,7 @@ def gem_version
     end
 
     def gem_major_version
-      gem_version.match(/(\d+)\./)[1]
+      gem_version.match(MAJOR_VERSION_REGEX)[1]
     end
 
     class NodePackageVersion
@@ -66,7 +67,7 @@ def relative_path?
 
       def major
         return if relative_path?
-        raw.match(/(\d+)\./)[1]
+        raw.match(MAJOR_VERSION_REGEX)[1]
       end
 
       private

spec/react_on_rails/version_checker_spec.rb

@@ -47,6 +47,24 @@ module ReactOnRails
           expect(logger.message).to be_nil
         end
       end
+
+      context "when package json uses a one-digit version string" do
+        let(:node_package_version) do
+          double_package_version(raw: '^6', major: '6')
+        end
+
+        it 'does not log a warning' do
+          stub_gem_version("6")
+          check_version(node_package_version, logger)
+          expect(logger.message).to be_nil
+        end
+
+        it 'logs a warning' do
+          stub_gem_version("5")
+          check_version(node_package_version, logger)
+          expect(logger.message).to be_present
+        end
+      end
     end
 
     def double_package_version(raw: nil, major: nil, relative_path: false)