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Project: Aruba 0.8.1

Publisher: Cucumber

Report disk usage

Sometimes you need to check, what amount of disk space a file consumes. We do
NOT support "directories" with #disk_usage. This does not work reliably
over different systems. Here can help '#disk_usage. But be careful, by
default it uses a block size of "512" (physical block size) to calculate the
usage. You may need to adjust this by using Aruba.configure { |config|
config.physical_block_size = 4_096 }. Don't get confused, if you check the
block size by using File::Stat (in ruby). It reports the block size of your
filesystem, which can be "4_096" for example.

We're gonna use the (correct) IEC-notation
(https://en.wikipedia.org/wiki/Binary_prefix) here:

* kilo => kibi
* mega => mebi
* giga => gibi

Background
Given
I use a fixture named "cli-app"
Scenarios
  1. Show disk usage for file
  2. Show disk usage for multiple files
  3. Convert reported disk usage to KibiByte
  4. Convert reported disk usage to MebiByte
  5. Convert reported disk usage to GibiByte
  6. Compare two repored disk usages
Show disk usage for file
Given
a file named "spec/disk_usage_spec.rb" with: 
require 'spec_helper'

RSpec.describe 'disk usage', :type => :aruba do
  let(:file) { 'file.txt' }

  before(:each) do 
    write_file file, 'a'
  end

  let(:size_of_single_block) { File::Stat.new(expand_path(file)).blksize }

  it { expect(disk_usage(file)).to eq size_of_single_block }
end
When
I run rspec
Then
the specs should all pass
Show disk usage for multiple files

#disk_usage creates the sum of all given objects' sizes.

Given
a file named "spec/disk_usage_spec.rb" with: 
require 'spec_helper'

RSpec.describe 'disk usage', :type => :aruba do
  let(:file1) { 'file1.txt' }
  let(:file2) { 'file2.txt' }

  before(:each) do 
    write_file file1, 'a'
    write_file file2, 'a'
  end

  let(:size_of_single_block) { File::Stat.new(expand_path(file1)).blksize }

  it { expect(disk_usage(file1, file2)).to eq size_of_single_block * 2 }
  it { expect(disk_usage([file1, file2])).to eq size_of_single_block * 2 }
end
When
I run rspec
Then
the specs should all pass
Convert reported disk usage to KibiByte
Given
a file named "spec/disk_usage_spec.rb" with: 
require 'spec_helper'

RSpec.describe 'disk usage', :type => :aruba do
  let(:file) { 'file.txt' }

  before(:each) do 
    write_file file, 'a'
  end

  let(:converted_size) { File::Stat.new(expand_path(file)).blksize.to_f / 1_024 }

  it { expect(disk_usage(file).to_kibi_byte).to eq converted_size }
end
When
I run rspec
Then
the specs should all pass
Convert reported disk usage to MebiByte
Given
a file named "spec/disk_usage_spec.rb" with: 
require 'spec_helper'

RSpec.describe 'disk usage', :type => :aruba do
  let(:file) { 'file.txt' }

  before(:each) do 
    write_file file, 'a'
  end

  let(:converted_size) { File::Stat.new(expand_path(file)).blksize.to_f / 1_024 / 1024 }

  it { expect(disk_usage(file).to_mebi_byte).to eq converted_size }
end
When
I run rspec
Then
the specs should all pass
Convert reported disk usage to GibiByte
Given
a file named "spec/disk_usage_spec.rb" with: 
require 'spec_helper'

RSpec.describe 'disk usage', :type => :aruba do
  let(:file) { 'file.txt' }

  before(:each) do 
    write_file file, 'a'
  end

  let(:converted_size) { File::Stat.new(expand_path(file)).blksize.to_f / 1_024 / 1_024 / 1_024 }

  it { expect(disk_usage(file).to_gibi_byte).to eq converted_size }
end
When
I run rspec
Then
the specs should all pass
Compare two repored disk usages
Given
a file named "spec/disk_usage_spec.rb" with: 
require 'spec_helper'

RSpec.describe 'disk usage', :type => :aruba do
  let(:file1) { 'file1.txt' }
  let(:file2) { 'file2.txt' }

  before(:each) do 
    write_file file1, 'a' * 10_000
    write_file file2, 'a'
  end

  before :each do
    @size1 = disk_usage(file1)
    @size2 = disk_usage(file2)
  end

  it { expect(@size1).to be > @size2 }
end
When
I run rspec
Then
the specs should all pass

Last published over 7 years ago by Max Meyer.