transferred Code Ocean from original repository to GitHub

db/seeds/files/data.txt

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+Foo
+Bar

db/seeds/files/exercise.rb

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+SOURCE_FILENAME = 'data.txt'
+TARGET_FILENAME = 'copy.txt'
+
+def copy_file
+  # Implement this method.
+end

db/seeds/files/exercise_spec.rb

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+require './exercise'
+
+describe '#write_to_file' do
+  before(:each) do
+    @file_content = File.new(SOURCE_FILENAME, 'r').read
+    write_to_file
+  end
+
+  it 'preserves the source file' do
+    expect(File.exist?(SOURCE_FILENAME)).to be true
+    expect(File.new(SOURCE_FILENAME, 'r').read).to eq(@file_content)
+  end
+
+  it 'creates the target file' do
+    expect(File.exist?(TARGET_FILENAME)).to be true
+  end
+
+  it 'copies the file content' do
+    expect(File.new(TARGET_FILENAME, 'r').read).to eq(@file_content)
+  end
+end