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|
Feature: Report disk usage
Sometimes you need to check, what amount of disk space a file consumes.
This is useful, since many tiny files will usually take up a lot more disk
space than their sizes suggest.
While not be very accurate, `'#disk_usage` helps estimate this "real"
allocated size on disk.
NOTE 1: currently "directories" are NOT supported.
NOTE 2: Aruba assumes the 'physical block size' is 512 bytes. (It usually is).
If your OS/filesystem doesn't report the number of blocks used (and your
allocation unit size is not 4096 bytes), you can change the default "block
size" Aruba uses for calculations:
E.g. for a 32kB "allocation unit size" and 16 blocks used for a tiny file
(check `File::Stat.blocks` reported by Ruby), just divide the
two numbers to get the "physical block size" you need to set:
`Aruba.configure { |config| config.physical_block_size = 32_768 / 16 }`.
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"
Scenario: Show disk usage for file
Given a file named "spec/disk_usage_spec.rb" with:
"""ruby
require 'spec_helper'
RSpec.describe 'disk usage', :type => :aruba do
let(:file) { 'file.txt' }
before 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
Scenario: 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:
"""ruby
require 'spec_helper'
RSpec.describe 'disk usage', :type => :aruba do
let(:file1) { 'file1.txt' }
let(:file2) { 'file2.txt' }
before 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
Scenario: Convert reported disk usage to KibiByte
Given a file named "spec/disk_usage_spec.rb" with:
"""ruby
require 'spec_helper'
RSpec.describe 'disk usage', :type => :aruba do
let(:file) { 'file.txt' }
before 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
Scenario: Convert reported disk usage to MebiByte
Given a file named "spec/disk_usage_spec.rb" with:
"""ruby
require 'spec_helper'
RSpec.describe 'disk usage', :type => :aruba do
let(:file) { 'file.txt' }
before 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
Scenario: Convert reported disk usage to GibiByte
Given a file named "spec/disk_usage_spec.rb" with:
"""ruby
require 'spec_helper'
RSpec.describe 'disk usage', :type => :aruba do
let(:file) { 'file.txt' }
before 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
Scenario: Compare two repored disk usages
Given a file named "spec/disk_usage_spec.rb" with:
"""ruby
require 'spec_helper'
RSpec.describe 'disk usage', :type => :aruba do
let(:file1) { 'file1.txt' }
let(:file2) { 'file2.txt' }
before 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
|
