Throw SFTP::Error when Bash process started by Shell fails

lib/sftp/shell.rb

@@ -3,6 +3,9 @@ module Shell
     def self.run(array_of_commands)
       command_str = [array_of_commands].join(" ")
       `bash  -c \"#{command_str}\"`
+      return if $CHILD_STATUS.success?
+
+      raise Error, "Error occurred during SFTP process: #{$CHILD_STATUS.exitstatus}"
     end
   end
 end

spec/sftp_spec.rb

@@ -95,3 +95,15 @@
     end
   end
 end
+
+RSpec.describe SFTP::Shell do
+  before(:each) do
+    @shell = SFTP::Shell
+  end
+
+  context "#run" do
+    it "throws Error when run fails" do
+      expect { @shell.run ["gobbledegook"] }.to raise_error(SFTP::Error)
+    end
+  end
+end