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require 'spec_helper'
describe Gitlab::Metrics::Instrumentation do
let(:transaction) { Gitlab::Metrics::Transaction.new }
before do
@dummy = Class.new do
def self.foo(text = 'foo')
text
end
def bar(text = 'bar')
text
end
end
allow(@dummy).to receive(:name).and_return('Dummy')
end
describe '.instrument_method' do
describe 'with metrics enabled' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(true)
Gitlab::Metrics::Instrumentation.instrument_method(@dummy, :foo)
end
it 'renames the original method' do
expect(@dummy).to respond_to(:_original_foo)
end
it 'calls the instrumented method with the correct arguments' do
expect(@dummy.foo).to eq('foo')
end
it 'tracks the call duration upon calling the method' do
allow(described_class).to receive(:transaction).
and_return(transaction)
expect(transaction).to receive(:add_metric).
with(described_class::SERIES, an_instance_of(Hash),
method: 'Dummy.foo')
@dummy.foo
end
end
describe 'with metrics disabled' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(false)
end
it 'does not instrument the method' do
described_class.instrument_method(@dummy, :foo)
expect(@dummy).to_not respond_to(:_original_foo)
end
end
end
describe '.instrument_instance_method' do
describe 'with metrics enabled' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(true)
described_class.
instrument_instance_method(@dummy, :bar)
end
it 'renames the original method' do
expect(@dummy.method_defined?(:_original_bar)).to eq(true)
end
it 'calls the instrumented method with the correct arguments' do
expect(@dummy.new.bar).to eq('bar')
end
it 'tracks the call duration upon calling the method' do
allow(described_class).to receive(:transaction).
and_return(transaction)
expect(transaction).to receive(:add_metric).
with(described_class::SERIES, an_instance_of(Hash),
method: 'Dummy#bar')
@dummy.new.bar
end
end
describe 'with metrics disabled' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(false)
end
it 'does not instrument the method' do
described_class.
instrument_instance_method(@dummy, :bar)
expect(@dummy.method_defined?(:_original_bar)).to eq(false)
end
end
end
describe '.instrument_methods' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(true)
end
it 'instruments all public class methods' do
described_class.instrument_methods(@dummy)
expect(@dummy).to respond_to(:_original_foo)
end
end
describe '.instrument_instance_methods' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(true)
end
it 'instruments all public instance methods' do
described_class.instrument_instance_methods(@dummy)
expect(@dummy.method_defined?(:_original_bar)).to eq(true)
end
end
end
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