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|
# frozen_string_literal: true
describe TestProf::MemoryProf::Tracker::RssTool do
subject { described_class }
describe ".tool" do
before do
allow(subject).to receive(:os_type).and_return(os_type)
end
context "when an OS is supported" do
let(:os_type) { :macosx }
it "returns an rss tool" do
expect(subject.tool).to be_kind_of(subject::PS)
end
end
context "when an OS is not supported" do
let(:os_type) { :invalid }
it "returns nil" do
expect(subject.tool).to eq(nil)
end
end
end
describe ".os_type" do
before do
@original_os = RbConfig::CONFIG["host_os"]
RbConfig::CONFIG["host_os"] = host_os
end
after do
RbConfig::CONFIG["host_os"] = @original_os
end
context "when the host OS is Linux" do
let(:host_os) { "linux" }
it "returns :linux" do
expect(subject.os_type).to eq(:linux)
end
end
context "when the host OS is macOS" do
let(:host_os) { "darwin22" }
it "returns :macosx" do
expect(subject.os_type).to eq(:macosx)
end
end
context "when the host OS is macOS" do
let(:host_os) { "mac os 14" }
it "returns :macosx" do
expect(subject.os_type).to eq(:macosx)
end
end
%w[solaris bsd].each do |os|
context "when the host OS is #{os}" do
let(:host_os) { "#{os} 17" }
it "returns :unix" do
expect(subject.os_type).to eq(:unix)
end
end
end
context "when the host OS is Windows" do
let(:host_os) { "mswin" }
it "returns :windows" do
expect(subject.os_type).to eq(:windows)
end
end
end
end
describe TestProf::MemoryProf::Tracker::RssTool::ProcFS do
subject { described_class.new }
describe "#track" do
before do
io = instance_double(IO, seek: nil, gets: "46441 196384 1804 1 0 24133 0\n")
allow(File).to receive(:open).and_return(io)
subject.instance_variable_set("@page_size", 1024)
end
it "retrieves rss via proc statm" do
subject.track
expect(File).to have_received(:open).with(/\/proc\/\d+\/statm/, "r")
end
it "returns the current rss" do
expect(subject.track).to eq(201097216)
end
end
end
describe TestProf::MemoryProf::Tracker::RssTool::PS do
subject { described_class.new }
describe "#track" do
before do
allow(subject).to receive(:`).and_return(" RSS\n196384")
end
it "retrieves rss via ps" do
subject.track
expect(subject).to have_received(:`).with(/ps -o rss -p \d+/)
end
it "returns the current rss" do
expect(subject.track).to eq(201097216)
end
end
end
describe TestProf::MemoryProf::Tracker::RssTool::GetProcess do
subject { described_class.new }
describe "#track" do
before do
allow(subject).to receive(:`).and_return("\n WS\n --\n201097216\n\n\n")
end
it "retrieves rss via Get-Process" do
subject.track
expect(subject).to have_received(:`).with(/powershell -Command "Get-Process -Id \d+ | select WS"/)
end
it "returns the current rss" do
expect(subject.track).to eq(201097216)
end
end
end
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