Is there a “not” equivalent in rspec, for e.g. the logical not for “and_return”
Couldn't find the method in the rspec docs, but is there an alternative to do this?
allow_any_instance_of(<some connection>).to receive(<post method>).and_return(200)
the above code block to not return 200 instead
ruby-on-rails rspec rspec-rails
asked Nov 19 '18 at 9:42
RooRoo
11
add a comment |
Couldn't find the method in the rspec docs, but is there an alternative to do this?
allow_any_instance_of(<some connection>).to receive(<post method>).and_return(200)
the above code block to not return 200 instead
ruby-on-rails rspec rspec-rails
asked Nov 19 '18 at 9:42
RooRoo
11
add a comment |
Couldn't find the method in the rspec docs, but is there an alternative to do this?
allow_any_instance_of(<some connection>).to receive(<post method>).and_return(200)
the above code block to not return 200 instead
ruby-on-rails rspec rspec-rails
asked Nov 19 '18 at 9:42
RooRoo
11
Couldn't find the method in the rspec docs, but is there an alternative to do this?
allow_any_instance_of(<some connection>).to receive(<post method>).and_return(200)
the above code block to not return 200 instead
ruby-on-rails rspec rspec-rails
ruby-on-rails rspec rspec-rails
asked Nov 19 '18 at 9:42
RooRoo
11
asked Nov 19 '18 at 9:42
RooRoo
11
asked Nov 19 '18 at 9:42
RooRoo
11
asked Nov 19 '18 at 9:42
RooRoo
11
asked Nov 19 '18 at 9:42
RooRoo
11
11
add a comment |
add a comment |
1 Answer
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You have fundamentally misunderstood what allow_any_instance_of and to_return do.
allow_any_instance_of is used to stub a method on any instance of a given class. It does not set any expectations - expect_any_instance_of does.
class Foo
def bar(*args)
"baz"
end
end
RSpec.describe Foo do
describe "allow_any_instance_of" do
it "does not create an expectation" do
allow_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
describe "expect_any_instance_of" do
it "sets an expectation" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(Foo.new.bar).to eq 'baz'
end
# this example will fail
it "fails if expected call is not sent" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
end
.and_return is used to set the return value of a mock/stub. It does not as you seem to believe set an expectation on the return value.
RSpec.describe Foo do
describe "and_return" do
it "changes the return value" do
allow_any_instance_of(Foo).to receive(:bar).and_return('hello world')
expect(Foo.new.bar).to_not eq 'baz'
expect(Foo.new.bar).to eq 'hello world'
end
end
end
You can use .and_call_original when you want to spy on a method without changing its return value. By default any method stubbed with allow_any_instance_of/expect_any_instance will return nil.
AFAIK its not possible to set an expectation on what the return value of .and_call_original is. Thats one of reasons why any_instance_of is considered a code smell and should be avoided.
answered Nov 19 '18 at 10:28
maxmax
45.9k860104
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1 Answer
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1 Answer
1
active
oldest
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active
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active
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votes
You have fundamentally misunderstood what allow_any_instance_of and to_return do.
allow_any_instance_of is used to stub a method on any instance of a given class. It does not set any expectations - expect_any_instance_of does.
class Foo
def bar(*args)
"baz"
end
end
RSpec.describe Foo do
describe "allow_any_instance_of" do
it "does not create an expectation" do
allow_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
describe "expect_any_instance_of" do
it "sets an expectation" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(Foo.new.bar).to eq 'baz'
end
# this example will fail
it "fails if expected call is not sent" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
end
.and_return is used to set the return value of a mock/stub. It does not as you seem to believe set an expectation on the return value.
RSpec.describe Foo do
describe "and_return" do
it "changes the return value" do
allow_any_instance_of(Foo).to receive(:bar).and_return('hello world')
expect(Foo.new.bar).to_not eq 'baz'
expect(Foo.new.bar).to eq 'hello world'
end
end
end
You can use .and_call_original when you want to spy on a method without changing its return value. By default any method stubbed with allow_any_instance_of/expect_any_instance will return nil.
AFAIK its not possible to set an expectation on what the return value of .and_call_original is. Thats one of reasons why any_instance_of is considered a code smell and should be avoided.
answered Nov 19 '18 at 10:28
maxmax
45.9k860104
add a comment |
You have fundamentally misunderstood what allow_any_instance_of and to_return do.
allow_any_instance_of is used to stub a method on any instance of a given class. It does not set any expectations - expect_any_instance_of does.
class Foo
def bar(*args)
"baz"
end
end
RSpec.describe Foo do
describe "allow_any_instance_of" do
it "does not create an expectation" do
allow_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
describe "expect_any_instance_of" do
it "sets an expectation" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(Foo.new.bar).to eq 'baz'
end
# this example will fail
it "fails if expected call is not sent" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
end
.and_return is used to set the return value of a mock/stub. It does not as you seem to believe set an expectation on the return value.
RSpec.describe Foo do
describe "and_return" do
it "changes the return value" do
allow_any_instance_of(Foo).to receive(:bar).and_return('hello world')
expect(Foo.new.bar).to_not eq 'baz'
expect(Foo.new.bar).to eq 'hello world'
end
end
end
You can use .and_call_original when you want to spy on a method without changing its return value. By default any method stubbed with allow_any_instance_of/expect_any_instance will return nil.
AFAIK its not possible to set an expectation on what the return value of .and_call_original is. Thats one of reasons why any_instance_of is considered a code smell and should be avoided.
answered Nov 19 '18 at 10:28
maxmax
45.9k860104
add a comment |
You have fundamentally misunderstood what allow_any_instance_of and to_return do.
allow_any_instance_of is used to stub a method on any instance of a given class. It does not set any expectations - expect_any_instance_of does.
class Foo
def bar(*args)
"baz"
end
end
RSpec.describe Foo do
describe "allow_any_instance_of" do
it "does not create an expectation" do
allow_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
describe "expect_any_instance_of" do
it "sets an expectation" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(Foo.new.bar).to eq 'baz'
end
# this example will fail
it "fails if expected call is not sent" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
end
.and_return is used to set the return value of a mock/stub. It does not as you seem to believe set an expectation on the return value.
RSpec.describe Foo do
describe "and_return" do
it "changes the return value" do
allow_any_instance_of(Foo).to receive(:bar).and_return('hello world')
expect(Foo.new.bar).to_not eq 'baz'
expect(Foo.new.bar).to eq 'hello world'
end
end
end
You can use .and_call_original when you want to spy on a method without changing its return value. By default any method stubbed with allow_any_instance_of/expect_any_instance will return nil.
AFAIK its not possible to set an expectation on what the return value of .and_call_original is. Thats one of reasons why any_instance_of is considered a code smell and should be avoided.
answered Nov 19 '18 at 10:28
maxmax
45.9k860104
You have fundamentally misunderstood what allow_any_instance_of and to_return do.
allow_any_instance_of is used to stub a method on any instance of a given class. It does not set any expectations - expect_any_instance_of does.
class Foo
def bar(*args)
"baz"
end
end
RSpec.describe Foo do
describe "allow_any_instance_of" do
it "does not create an expectation" do
allow_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
describe "expect_any_instance_of" do
it "sets an expectation" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(Foo.new.bar).to eq 'baz'
end
# this example will fail
it "fails if expected call is not sent" do
expect_any_instance_of(Foo).to receive(:bar).and_call_original
expect(true).to be_truthy
end
end
end
.and_return is used to set the return value of a mock/stub. It does not as you seem to believe set an expectation on the return value.
RSpec.describe Foo do
describe "and_return" do
it "changes the return value" do
allow_any_instance_of(Foo).to receive(:bar).and_return('hello world')
expect(Foo.new.bar).to_not eq 'baz'
expect(Foo.new.bar).to eq 'hello world'
end
end
end
You can use .and_call_original when you want to spy on a method without changing its return value. By default any method stubbed with allow_any_instance_of/expect_any_instance will return nil.
AFAIK its not possible to set an expectation on what the return value of .and_call_original is. Thats one of reasons why any_instance_of is considered a code smell and should be avoided.
answered Nov 19 '18 at 10:28
maxmax
45.9k860104
edited Nov 19 '18 at 10:40
answered Nov 19 '18 at 10:28
maxmax
45.9k860104
answered Nov 19 '18 at 10:28
maxmax
45.9k860104
answered Nov 19 '18 at 10:28
maxmax
45.9k860104
45.9k860104
add a comment |
add a comment |
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