add build test for a builder waiting on another builder

build_tests/simple/builder_wait_for_builder.rb

@@ -0,0 +1,23 @@
+class MyObject < Rscons::Builder
+  def run(options)
+    if @builder
+      if File.exists?(@target)
+        true
+      else
+        false
+      end
+    else
+      @env.print_builder_run_message("#{name} #{@target}", nil)
+      @builder = @env.Object(@target, @sources, @vars)
+      wait_for(@builder)
+    end
+  end
+end
+
+build do
+  Environment.new do |env|
+    env.add_builder(MyObject)
+    env.MyObject("simple.o", "simple.c")
+    env.Program("simple.exe", "simple.o")
+  end
+end

spec/build_tests_spec.rb

@@ -350,6 +350,16 @@ EOF
     expect(File.exists?("foo")).to be_truthy
   end
 
+  it 'supports a Builder waiting for another Builder' do
+    test_dir "simple"
+    result = run_rscons(rsconscript: "builder_wait_for_builder.rb")
+    expect(result.stderr).to eq ""
+    expect(result.status).to eq 0
+    expect(lines(result.stdout)).to include "MyObject simple.o"
+    expect(File.exists?("simple.o")).to be_truthy
+    expect(File.exists?("simple.exe")).to be_truthy
+  end
+
   it 'allows cloning Environment objects' do
     test_dir('clone_env')
     result = run_rscons