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# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2025, by Samuel Williams.
require "protocol/http/header/server_timing"
require "sus"
describe Protocol::HTTP::Header::ServerTiming do
let(:header) {subject.new(description)}
with "empty header" do
let(:header) {subject.new}
it "should be empty" do
expect(header.to_s).to be == ""
end
it "should be an array" do
expect(header).to be_a(Array)
end
it "should return empty metrics" do
expect(header.metrics).to be == []
end
end
with "db;dur=53.2" do
it "can parse metric with duration" do
metrics = header.metrics
expect(metrics.size).to be == 1
expect(metrics.first.name).to be == "db"
expect(metrics.first.duration).to be == 53.2
expect(metrics.first.description).to be_nil
end
end
with 'db;dur="53.2"' do
it "can parse metric with quoted duration" do
metrics = header.metrics
expect(metrics.size).to be == 1
expect(metrics.first.name).to be == "db"
expect(metrics.first.duration).to be == 53.2
expect(metrics.first.description).to be_nil
end
end
with 'cache;desc="Redis lookup"' do
it "can parse metric with description" do
metrics = header.metrics
expect(metrics.size).to be == 1
expect(metrics.first.name).to be == "cache"
expect(metrics.first.duration).to be_nil
expect(metrics.first.description).to be == "Redis lookup"
end
end
with 'app;dur=12.7;desc="Application logic"' do
it "can parse metric with duration and description" do
metrics = header.metrics
expect(metrics.first.name).to be == "app"
expect(metrics.first.duration).to be == 12.7
expect(metrics.first.description).to be == "Application logic"
end
end
with 'app;dur="12.7";desc="Application logic"' do
it "can parse metric with quoted duration and quoted description" do
metrics = header.metrics
expect(metrics.first.name).to be == "app"
expect(metrics.first.duration).to be == 12.7
expect(metrics.first.description).to be == "Application logic"
end
end
with "db;dur=45.3, app;dur=12.7;desc=\"Application logic\", cache;desc=\"Cache miss\"" do
it "can parse multiple metrics" do
metrics = header.metrics
expect(metrics.size).to be == 3
expect(metrics[0].name).to be == "db"
expect(metrics[0].duration).to be == 45.3
expect(metrics[0].description).to be_nil
expect(metrics[1].name).to be == "app"
expect(metrics[1].duration).to be == 12.7
expect(metrics[1].description).to be == "Application logic"
expect(metrics[2].name).to be == "cache"
expect(metrics[2].duration).to be_nil
expect(metrics[2].description).to be == "Cache miss"
end
end
with "cache-hit" do
it "can parse metric with name only" do
metrics = header.metrics
expect(metrics.first.name).to be == "cache-hit"
expect(metrics.first.duration).to be_nil
expect(metrics.first.description).to be_nil
end
end
with "invalid;unknown=param" do
it "ignores unknown parameters" do
metrics = header.metrics
expect(metrics.first.name).to be == "invalid"
expect(metrics.first.duration).to be_nil
expect(metrics.first.description).to be_nil
end
end
with "invalid-metric-name!" do
it "raises ParseError for invalid metric name" do
expect do
header.metrics
end.to raise_exception(Protocol::HTTP::Header::ServerTiming::ParseError)
end
end
with "#<<" do
let(:header) {subject.new}
it "can add metrics from string" do
header << "db;dur=25.5"
header << "cache;dur=5.2;desc=\"Hit\""
expect(header.size).to be == 2
metrics = header.metrics
expect(metrics[0].name).to be == "db"
expect(metrics[1].name).to be == "cache"
end
it "can add multiple metrics at once" do
header << "db;dur=25.5, cache;desc=\"Hit\""
expect(header.size).to be == 2
metrics = header.metrics
expect(metrics[0].name).to be == "db"
expect(metrics[1].name).to be == "cache"
end
end
with "inherited Split behavior" do
let(:header) {subject.new}
it "behaves as an array" do
header << "db;dur=25.5"
expect(header.size).to be == 1
expect(header.first).to be == "db;dur=25.5"
end
it "can be enumerated" do
header << "db;dur=25.5, cache;desc=\"Hit\""
values = []
header.each {|value| values << value}
expect(values).to be == ["db;dur=25.5", "cache;desc=\"Hit\""]
end
it "supports array methods" do
header << "db;dur=25.5, cache;desc=\"Hit\""
expect(header.length).to be == 2
expect(header.empty?).to be == false
end
end
with "trailer support" do
it "should be allowed as a trailer" do
expect(subject.trailer?).to be == true
end
end
with "cache_hit" do
it "can parse metric with underscore in name" do
metrics = header.metrics
expect(metrics.first.name).to be == "cache_hit"
end
end
with "test;desc=unquoted-value" do
it "can parse unquoted description" do
metrics = header.metrics
expect(metrics.first.description).to be == "unquoted-value"
end
end
with 'test;desc=""' do
it "can parse empty quoted description" do
metrics = header.metrics
expect(metrics.first.description).to be == ""
end
end
with "test;dur=123;desc=mixed;unknown=ignored" do
it "ignores unknown parameters and processes known ones" do
metrics = header.metrics
expect(metrics.first.name).to be == "test"
expect(metrics.first.duration).to be == 123.0
expect(metrics.first.description).to be == "mixed"
end
end
with "test;dur=0" do
it "can parse zero duration" do
metrics = header.metrics
expect(metrics.first.duration).to be == 0.0
end
end
with "test;dur=123.456789" do
it "preserves decimal precision" do
metrics = header.metrics
expect(metrics.first.duration).to be == 123.456789
end
end
end
describe Protocol::HTTP::Header::ServerTiming::Metric do
it "can create metric directly" do
metric = subject.new("test", 123.45, "Test metric")
expect(metric.name).to be == "test"
expect(metric.duration).to be == 123.45
expect(metric.description).to be == "Test metric"
expect(metric.to_s).to be == "test;dur=123.45;desc=\"Test metric\""
end
it "can create metric with name only" do
metric = subject.new("cache")
expect(metric.name).to be == "cache"
expect(metric.duration).to be_nil
expect(metric.description).to be_nil
expect(metric.to_s).to be == "cache"
end
it "can create metric with duration only" do
metric = subject.new("test", 123.45, nil)
expect(metric.to_s).to be == "test;dur=123.45"
end
it "can create metric with description only" do
metric = subject.new("test", nil, "description")
expect(metric.to_s).to be == "test;desc=\"description\""
end
it "handles nil values correctly" do
metric = subject.new("test", nil, nil)
expect(metric.to_s).to be == "test"
end
end
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