Assistance helpers and custom type for easy testing Gruf controllers with RSpec.
gem 'gruf-rspec'
Then add the following code to your spec_helper.rb
:
require 'gruf/rspec'
Note that this gem requires at least Gruf 2.5.1+ and RSpec 3.8+.
- Add a test for a Gruf controller in
spec/rpc
- Run the
run_rpc
method with two args: The gRPC method name, and the request object - Validate the response
Let's assume you have a gruf controller named ThingController
that is bound to the gRPC
service Rpc::Things::Service
. That has a method GetThing
:
class ThingController < Gruf::Controllers::Base
bind ::Rpc::Things::Service
def get_thing
Rpc::GetThingResponse.new(id: request.message.id)
end
end
To test it, you'd create spec/rpc/thing_controller_spec.rb
:
describe ThingController do
describe '.get_thing' do
let(:request_proto) { Rpc::GetThingRequest.new(id: rand(1..100)) }
subject { run_rpc(:GetThing, request_proto) }
it 'will return the thing' do
expect(subject).to be_a(Rpc::GetThingResponse)
expect(subject.id).to eq request_proto.id
end
end
end
Alternatively, you can pass a block:
it 'will return the thing' do
run_rpc(:GetThing, request_proto) do |resp|
expect(resp).to be_a(Rpc::GetThingResponse)
expect(resp.id).to eq request_proto.id
end
end
Note that you can also access the bound gRPC service class:
it 'binds the service correctly' do
expect(grpc_bound_service).to eq Rpc::Things::Service
end
You can match against errors as well:
describe 'testing an error' do
let(:request_proto) { Rpc::GetThingRequest.new(id: rand(1..100)) }
subject { run_rpc(:GetThing, request_proto) }
it 'should fail with the appropriate error' do
expect { subject }.to raise_rpc_error(GRPC::InvalidArgument)
end
end
Or further, even check your serialized error that is passed in metadata:
it 'should fail with the appropriate error code' do
expect { subject }.to raise_rpc_error(GRPC::InvalidArgument).with_serialized { |err|
expect(err).to be_a(MyCustomErrorClass)
expect(err.error_code).to eq 'invalid_request'
fe = err.field_errors.first
expect(fe.field_name).to eq 'name'
expect(fe.error_code).to eq 'invalid_name'
expect(fe.error_message).to eq
}
end
Note that when using with_serialized
, you must pass the block with { }
, not using
do
and end
.
By default, the type matcher for Gruf controllers matches in /spec/rpc
. You can customize this by configuring it
in the Gruf::Rspec
confiugration block like so:
Gruf::Rspec.configure do |c|
c.rpc_spec_path = '/spec/rpc_controllers'
end
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