[英]Stubbing a costly method with Rspec
在以下情况下,我只想将哈希传递给存根测试双。 我不想测试双重本身。 但是我需要在测试中模仿它。 实际方法如下所示:
# user.rb
def do_work
assignments = fetch_assignments
if assignments.any?
assignments.each do |assignment|
if assignment.valid?
client.approve_assignment({assignment_id: assignment.assignment_id})
else
client.reject_assignment({assignment_id: assignment.assignment_id})
end
end
mark_assignments_as_complete
end
end
现在,我可以轻松测试除客户端以外的所有功能。 客户端是一个真正昂贵的(每次查询要花钱)API查询,我不想每次运行测试都运行。 因此,我使用测试双打和存根:
describe "#do_work" do
context "when two assignments are valid" do
before :context do
@user = User.create!({name: "Bob"})
[{assignment_id: "1", valid: false}, {assignment_id: 2, valid: false}, {assignment_id: "3", valid: true}].each do |assignment|
@user.assignments.create!(assignment)
end
@client = ExpensiveAPI.new
@user.client = @client
end
end
describe "#do_work" do
it "accepts valid assignments" do
user.valid_assignments.each do |assignment|
allow(@client).to receive(:accept_assignment, {assignment_id: assignment.assignment_id}).and_return(true)
end
expect(@user.do_work).to have 2_completed_assignments
end
it "rejects invalid assignments" do
user.valid_assignments.each do |assignment|
allow(@client).to receive(:accept_assignment, {assignment_id: assignment.assignment_id}).and_return(true)
end
expect(@user.do_work).to have 1_incomplete_assignment
end
end
end
当我尝试将参数传递给存根方法时,出现以下错误:
ArgumentError: wrong number of arguments (2 for 1)
我认为这是一个语法问题。 使用参数对方法进行存根的格式(按照https://relishapp.com/rspec/rspec-mocks/v/2-99/docs/method-stubs )为:
allow(obj).to接收(:message).with('一个参数'){...}
但是您将期望的参数作为第二个参数传递给receive(...),这就是为什么它抱怨只需要一个参数。
将您的规格更改为:
describe "#do_work" do
context "when two assignments are valid" do
before :context do
@user = User.create!({name: "Bob"})
[{assignment_id: "1", valid: false}, {assignment_id: 2, valid: false}, {assignment_id: "3", valid: true}].each do |assignment|
@user.assignments.create!(assignment)
end
@client = ExpensiveAPI.new
@user.client = @client
end
end
describe "#do_work" do
it "accepts valid assignments" do
user.valid_assignments.each do |assignment|
allow(@client).to receive(:accept_assignment).with({assignment_id: assignment.assignment_id}).and_return(true)
end
expect(@user.do_work).to have 2_completed_assignments
end
it "rejects invalid assignments" do
user.valid_assignments.each do |assignment|
allow(@client).to receive(:accept_assignment).with({assignment_id: assignment.assignment_id}).and_return(true)
end
expect(@user.do_work).to have 1_incomplete_assignment
end
end
end
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