From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/test/rake/test_rake_thread_pool.rb | 145 ++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 jni/ruby/test/rake/test_rake_thread_pool.rb

(limited to 'jni/ruby/test/rake/test_rake_thread_pool.rb')

diff --git a/jni/ruby/test/rake/test_rake_thread_pool.rb b/jni/ruby/test/rake/test_rake_thread_pool.rb
new file mode 100644
index 0000000..35a1fe9
--- /dev/null
+++ b/jni/ruby/test/rake/test_rake_thread_pool.rb
@@ -0,0 +1,145 @@
+require File.expand_path('../helper', __FILE__)
+require 'rake/thread_pool'
+
+class TestRakeTestThreadPool < Rake::TestCase
+  include Rake
+
+  def test_pool_executes_in_current_thread_for_zero_threads
+    pool = ThreadPool.new(0)
+    f = pool.future { Thread.current }
+    pool.join
+    assert_equal Thread.current, f.value
+  end
+
+  def test_pool_executes_in_other_thread_for_pool_of_size_one
+    pool = ThreadPool.new(1)
+    f = pool.future { Thread.current }
+    pool.join
+    refute_equal Thread.current, f.value
+  end
+
+  def test_pool_executes_in_two_other_threads_for_pool_of_size_two
+    pool = ThreadPool.new(2)
+    threads = 2.times.map {
+      pool.future {
+        sleep 0.1
+        Thread.current
+      }
+    }.each { |f|
+      f.value
+    }
+
+    refute_equal threads[0], threads[1]
+    refute_equal Thread.current, threads[0]
+    refute_equal Thread.current, threads[1]
+  ensure
+    pool.join
+  end
+
+  def test_pool_creates_the_correct_number_of_threads
+    pool = ThreadPool.new(2)
+    threads = Set.new
+    t_mutex = Mutex.new
+    10.times.each do
+      pool.future do
+        sleep 0.02
+        t_mutex.synchronize { threads << Thread.current }
+      end
+    end
+    pool.join
+    assert_equal 2, threads.count
+  end
+
+  def test_pool_future_does_not_duplicate_arguments
+    pool = ThreadPool.new(2)
+    obj = Object.new
+    captured = nil
+    pool.future(obj) { |var| captured = var }
+    pool.join
+    assert_equal obj, captured
+  end
+
+  def test_pool_join_empties_queue
+    pool = ThreadPool.new(2)
+    repeat = 25
+    repeat.times {
+      pool.future do
+        repeat.times {
+          pool.future do
+            repeat.times {
+              pool.future do end
+            }
+          end
+        }
+      end
+    }
+
+    pool.join
+    assert_equal(
+      true,
+      pool.__send__(:__queue__).empty?,
+      "queue should be empty")
+  end
+
+  CustomError = Class.new(StandardError)
+
+  # test that throwing an exception way down in the blocks propagates
+  # to the top
+  def test_exceptions
+    pool = ThreadPool.new(10)
+
+    deep_exception_block = lambda do |count|
+      raise CustomError if count < 1
+      pool.future(count - 1, &deep_exception_block).value
+    end
+
+    assert_raises(CustomError) do
+      pool.future(2, &deep_exception_block).value
+    end
+  ensure
+    pool.join
+  end
+
+  def test_pool_prevents_deadlock
+    pool = ThreadPool.new(5)
+
+    common_dependency_a = pool.future { sleep 0.2 }
+    futures_a = 10.times.map {
+      pool.future {
+        common_dependency_a.value
+        sleep(rand() * 0.01)
+      }
+    }
+
+    common_dependency_b = pool.future { futures_a.each { |f| f.value } }
+    futures_b = 10.times.map {
+      pool.future {
+        common_dependency_b.value
+        sleep(rand() * 0.01)
+      }
+    }
+
+    futures_b.each { |f| f.value }
+    pool.join
+  end
+
+  def test_pool_reports_correct_results
+    pool = ThreadPool.new(7)
+
+    a = 18
+    b = 5
+    c = 3
+
+    result = a.times.map do
+      pool.future do
+        b.times.map do
+          pool.future { sleep rand * 0.001; c }
+        end.reduce(0) { |m, f| m + f.value }
+      end
+    end.reduce(0) { |m, f| m + f.value }
+
+    assert_equal a * b * c, result
+    pool.join
+  end
+
+end
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