Add seed parameter to turbo tests

README.md

@@ -4,7 +4,7 @@
 
 <div align="center">
    <img src="https://user-images.githubusercontent.com/78694043/233910064-87a6d557-1120-42d2-b965-2a9403c6f2f4.svg" width="500" alt="Turbo-Tests">
-  
+
 </div>
 
 <div align="center">
@@ -96,6 +96,7 @@ Options:
         --runtime-log FILE           Location of previously recorded test runtimes
     -v, --verbose                    More output
         --fail-fast=[N]
+        --seed SEED                  Seed for rspec
 ```
 
 ## Development

lib/turbo_tests/cli.rb

@@ -16,6 +16,7 @@ def run
       runtime_log = nil
       verbose = false
       fail_fast = nil
+      seed = nil
 
       OptionParser.new { |opts|
         opts.banner = <<~BANNER
@@ -76,6 +77,10 @@ def run
           end
           fail_fast = n.nil? || n < 1 ? 1 : n
         end
+
+        opts.on("--seed SEED", "Seed for rspec") do |s|
+          seed = s
+        end
       }.parse!(@argv)
 
       requires.each { |f| require(f) }
@@ -101,6 +106,7 @@ def run
         verbose: verbose,
         fail_fast: fail_fast,
         count: count,
+        seed: seed
       )
 
       if success

lib/turbo_tests/reporter.rb

@@ -114,6 +114,11 @@ def finish
         RSpec::Core::Notifications::NullNotification)
     end
 
+    def seed_notification(seed, seed_used)
+      puts RSpec::Core::Notifications::SeedNotification.new(seed, seed_used).fully_formatted
+      puts
+    end
+
     protected
 
     def delegate_to_formatters(method, *args)

lib/turbo_tests/runner.rb

@@ -20,6 +20,8 @@ def self.run(opts = {})
       verbose = opts.fetch(:verbose, false)
       fail_fast = opts.fetch(:fail_fast, nil)
       count = opts.fetch(:count, nil)
+      seed = opts.fetch(:seed, rand(0xFFFF).to_s)
+      seed_used = !opts[:seed].nil?
 
       if verbose
         STDERR.puts "VERBOSE"
@@ -34,7 +36,9 @@ def self.run(opts = {})
         runtime_log: runtime_log,
         verbose: verbose,
         fail_fast: fail_fast,
-        count: count
+        count: count,
+        seed: seed,
+        seed_used: seed_used
       ).run
     end
 
@@ -49,6 +53,8 @@ def initialize(opts)
       @load_time = 0
       @load_count = 0
       @failure_count = 0
+      @seed = opts[:seed]
+      @seed_used = opts[:seed_used]
 
       @messages = Thread::Queue.new
       @threads = []
@@ -86,6 +92,8 @@ def run
 
       report_number_of_tests(tests_in_groups)
 
+      @reporter.seed_notification(@seed, @seed_used)
+
       wait_threads = tests_in_groups.map.with_index do |tests, process_id|
         start_regular_subprocess(tests, process_id + 1, **subprocess_opts)
       end
@@ -94,6 +102,8 @@ def run
 
       @reporter.finish
 
+      @reporter.seed_notification(@seed, @seed_used)
+
       @threads.each(&:join)
 
       @reporter.failed_examples.empty? && wait_threads.map(&:value).all?(&:success?)
@@ -150,7 +160,7 @@ def start_subprocess(env, extra_args, tests, process_id, record_runtime:)
         command = [
           ENV["BUNDLE_BIN_PATH"], "exec", "rspec",
           *extra_args,
-          "--seed", rand(0xFFFF).to_s,
+          "--seed", @seed,
           "--format", "TurboTests::JsonRowsFormatter",
           "--out", tmp_filename,
           *record_runtime_options,

spec/cli_spec.rb

@@ -1,5 +1,5 @@
 RSpec.describe TurboTests::CLI do
-  subject(:output) { `bundle exec turbo_tests -f d #{fixture}`.strip }
+  subject(:output) { `bundle exec turbo_tests -f d #{fixture} --seed 1234`.strip }
 
   before { output }
 
@@ -8,6 +8,9 @@
       %(
 1 processes for 1 specs, ~ 1 specs per process
 
+Randomized with seed 1234
+
+
 An error occurred while loading #{fixture}.
 \e[31mFailure/Error: \e[0m\e[1;34m1\e[0m / \e[1;34m0\e[0m\e[0m
 \e[31m\e[0m
@@ -18,14 +21,19 @@
 \e[36m# #{fixture}:1:in `<top (required)>'\e[0m
 ).strip
     }
+    let(:expected_end_of_output) do
+      "0 examples, 0 failures\n"\
+        "\n\n"\
+        "Randomized with seed 1234"
+    end
 
     let(:fixture) { "./fixtures/rspec/errors_outside_of_examples_spec.rb" }
 
     it "reports" do
       expect($?.exitstatus).to eql(1)
 
       expect(output).to start_with(expected_start_of_output)
-      expect(output).to end_with("0 examples, 0 failures")
+      expect(output).to end_with(expected_end_of_output)
     end
   end
 
@@ -66,7 +74,7 @@
         expect(output).to include(part)
       end
 
-      expect(output).to end_with("3 examples, 0 failures, 3 pending")
+      expect(output).to end_with("3 examples, 0 failures, 3 pending\n\n\nRandomized with seed 1234")
     end
   end