Testing gets in rspec (user input)
My class has this #run method that so far is just this, to test the testing:
def run
puts "Enter 'class' to create a new class."
input = $stdin.gets.chomp
binding.pry
And in the tests so far I've got
allow($stdin).to receive(:gets).and_return 'class'
cli.run
Doing it this way I am able to see, in the pry session, that input has been set to 'class', as intended.
Is there a way to do with without adding $stdin to my call to gets in my method itself? i.e., input = gets.chomp
I've tried allow(cli.run).to receive(:gets).and_return 'class'
But then in the pry session, input is equal to the first line of the spec file!
ruby rspec mocking
asked Nov 28 '18 at 19:56
Jonathan TuzmanJonathan Tuzman
532618
add a comment |
My class has this #run method that so far is just this, to test the testing:
def run
puts "Enter 'class' to create a new class."
input = $stdin.gets.chomp
binding.pry
And in the tests so far I've got
allow($stdin).to receive(:gets).and_return 'class'
cli.run
Doing it this way I am able to see, in the pry session, that input has been set to 'class', as intended.
Is there a way to do with without adding $stdin to my call to gets in my method itself? i.e., input = gets.chomp
I've tried allow(cli.run).to receive(:gets).and_return 'class'
But then in the pry session, input is equal to the first line of the spec file!
ruby rspec mocking
asked Nov 28 '18 at 19:56
Jonathan TuzmanJonathan Tuzman
532618
add a comment |
My class has this #run method that so far is just this, to test the testing:
def run
puts "Enter 'class' to create a new class."
input = $stdin.gets.chomp
binding.pry
And in the tests so far I've got
allow($stdin).to receive(:gets).and_return 'class'
cli.run
Doing it this way I am able to see, in the pry session, that input has been set to 'class', as intended.
Is there a way to do with without adding $stdin to my call to gets in my method itself? i.e., input = gets.chomp
I've tried allow(cli.run).to receive(:gets).and_return 'class'
But then in the pry session, input is equal to the first line of the spec file!
ruby rspec mocking
asked Nov 28 '18 at 19:56
Jonathan TuzmanJonathan Tuzman
532618
My class has this #run method that so far is just this, to test the testing:
def run
puts "Enter 'class' to create a new class."
input = $stdin.gets.chomp
binding.pry
And in the tests so far I've got
allow($stdin).to receive(:gets).and_return 'class'
cli.run
Doing it this way I am able to see, in the pry session, that input has been set to 'class', as intended.
Is there a way to do with without adding $stdin to my call to gets in my method itself? i.e., input = gets.chomp
I've tried allow(cli.run).to receive(:gets).and_return 'class'
But then in the pry session, input is equal to the first line of the spec file!
ruby rspec mocking
ruby rspec mocking
asked Nov 28 '18 at 19:56
Jonathan TuzmanJonathan Tuzman
532618
asked Nov 28 '18 at 19:56
Jonathan TuzmanJonathan Tuzman
532618
asked Nov 28 '18 at 19:56
Jonathan TuzmanJonathan Tuzman
532618
asked Nov 28 '18 at 19:56
Jonathan TuzmanJonathan Tuzman
532618
asked Nov 28 '18 at 19:56
Jonathan TuzmanJonathan Tuzman
532618
532618
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You can avoid this as such:
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
describe 'gets' do
it 'belongs to Kernel' do
allow_any_instance_of(Kernel).to receive(:gets).and_return('class')
expect(run).to eq('class')
end
end
The method gets actually belongs to the Kernel module. (method(:gets).owner == Kernel). Since Kernel is included in Object and almost all ruby objects inherit from Object this will work.
Now if run is an instance method scoped in a Class I would recommend scoping the stubbing a bit more such that:
class Test
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
end
describe 'gets' do
it 'can be stubbed lower than that' do
allow_any_instance_of(Test).to receive(:gets).and_return('class')
expect(Test.new.run).to eq('class')
end
# or even
it 'or even lower than that' do
cli = Test.new
allow(cli).to receive(:gets).and_return('class')
expect(cli.run).to eq('class')
end
end
Example
answered Nov 28 '18 at 21:38
engineersmnkyengineersmnky
13.8k12241
Thanks!allow(cli).to receive(:gets).and_return('class')is exactly the kind of thing I was looking for, and it works.
– Jonathan Tuzman
Nov 28 '18 at 23:01
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can avoid this as such:
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
describe 'gets' do
it 'belongs to Kernel' do
allow_any_instance_of(Kernel).to receive(:gets).and_return('class')
expect(run).to eq('class')
end
end
The method gets actually belongs to the Kernel module. (method(:gets).owner == Kernel). Since Kernel is included in Object and almost all ruby objects inherit from Object this will work.
Now if run is an instance method scoped in a Class I would recommend scoping the stubbing a bit more such that:
class Test
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
end
describe 'gets' do
it 'can be stubbed lower than that' do
allow_any_instance_of(Test).to receive(:gets).and_return('class')
expect(Test.new.run).to eq('class')
end
# or even
it 'or even lower than that' do
cli = Test.new
allow(cli).to receive(:gets).and_return('class')
expect(cli.run).to eq('class')
end
end
Example
answered Nov 28 '18 at 21:38
engineersmnkyengineersmnky
13.8k12241
Thanks!allow(cli).to receive(:gets).and_return('class')is exactly the kind of thing I was looking for, and it works.
– Jonathan Tuzman
Nov 28 '18 at 23:01
add a comment |
You can avoid this as such:
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
describe 'gets' do
it 'belongs to Kernel' do
allow_any_instance_of(Kernel).to receive(:gets).and_return('class')
expect(run).to eq('class')
end
end
The method gets actually belongs to the Kernel module. (method(:gets).owner == Kernel). Since Kernel is included in Object and almost all ruby objects inherit from Object this will work.
Now if run is an instance method scoped in a Class I would recommend scoping the stubbing a bit more such that:
class Test
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
end
describe 'gets' do
it 'can be stubbed lower than that' do
allow_any_instance_of(Test).to receive(:gets).and_return('class')
expect(Test.new.run).to eq('class')
end
# or even
it 'or even lower than that' do
cli = Test.new
allow(cli).to receive(:gets).and_return('class')
expect(cli.run).to eq('class')
end
end
Example
answered Nov 28 '18 at 21:38
engineersmnkyengineersmnky
13.8k12241
Thanks!allow(cli).to receive(:gets).and_return('class')is exactly the kind of thing I was looking for, and it works.
– Jonathan Tuzman
Nov 28 '18 at 23:01
add a comment |
You can avoid this as such:
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
describe 'gets' do
it 'belongs to Kernel' do
allow_any_instance_of(Kernel).to receive(:gets).and_return('class')
expect(run).to eq('class')
end
end
The method gets actually belongs to the Kernel module. (method(:gets).owner == Kernel). Since Kernel is included in Object and almost all ruby objects inherit from Object this will work.
Now if run is an instance method scoped in a Class I would recommend scoping the stubbing a bit more such that:
class Test
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
end
describe 'gets' do
it 'can be stubbed lower than that' do
allow_any_instance_of(Test).to receive(:gets).and_return('class')
expect(Test.new.run).to eq('class')
end
# or even
it 'or even lower than that' do
cli = Test.new
allow(cli).to receive(:gets).and_return('class')
expect(cli.run).to eq('class')
end
end
Example
answered Nov 28 '18 at 21:38
engineersmnkyengineersmnky
13.8k12241
You can avoid this as such:
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
describe 'gets' do
it 'belongs to Kernel' do
allow_any_instance_of(Kernel).to receive(:gets).and_return('class')
expect(run).to eq('class')
end
end
The method gets actually belongs to the Kernel module. (method(:gets).owner == Kernel). Since Kernel is included in Object and almost all ruby objects inherit from Object this will work.
Now if run is an instance method scoped in a Class I would recommend scoping the stubbing a bit more such that:
class Test
def run
puts "Enter 'class' to create a new class."
input = gets.chomp
end
end
describe 'gets' do
it 'can be stubbed lower than that' do
allow_any_instance_of(Test).to receive(:gets).and_return('class')
expect(Test.new.run).to eq('class')
end
# or even
it 'or even lower than that' do
cli = Test.new
allow(cli).to receive(:gets).and_return('class')
expect(cli.run).to eq('class')
end
end
Example
answered Nov 28 '18 at 21:38
engineersmnkyengineersmnky
13.8k12241
edited Nov 28 '18 at 21:46
answered Nov 28 '18 at 21:38
engineersmnkyengineersmnky
13.8k12241
answered Nov 28 '18 at 21:38
engineersmnkyengineersmnky
13.8k12241
answered Nov 28 '18 at 21:38
engineersmnkyengineersmnky
13.8k12241
13.8k12241
Thanks!allow(cli).to receive(:gets).and_return('class')is exactly the kind of thing I was looking for, and it works.
– Jonathan Tuzman
Nov 28 '18 at 23:01
add a comment |
Thanks!allow(cli).to receive(:gets).and_return('class')is exactly the kind of thing I was looking for, and it works.
– Jonathan Tuzman
Nov 28 '18 at 23:01
Thanks!
allow(cli).to receive(:gets).and_return('class') is exactly the kind of thing I was looking for, and it works.– Jonathan Tuzman
Nov 28 '18 at 23:01
Thanks!
allow(cli).to receive(:gets).and_return('class') is exactly the kind of thing I was looking for, and it works.– Jonathan Tuzman
Nov 28 '18 at 23:01
add a comment |
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