1 files changed, 25 insertions, 0 deletions
diff --git a/test/rubygems/test_gem_specification.rb b/test/rubygems/test_gem_specification.rb
index d893a7191e..0623e8d51d 100644
--- a/test/rubygems/test_gem_specification.rb
+++ b/test/rubygems/test_gem_specification.rb
@@ -67,6 +67,7 @@ end
 
       s.mark_version
       s.files = %w[lib/code.rb]
+      s.installed_by_version = v('2.2')
     end
   end
 
@@ -1221,6 +1222,19 @@ dependencies: []
     refute_path_exists @a1.extension_install_dir
   end
 
+  def test_build_extensions_old
+    ext_spec
+
+    refute_empty @ext.extensions, 'sanity check'
+
+    @ext.installed_by_version = v(0)
+
+    @ext.build_extensions
+
+    gem_make_out = File.join @ext.extension_install_dir, 'gem_make.out'
+    refute_path_exists gem_make_out
+  end
+
   def test_contains_requirable_file_eh
     code_rb = File.join @a1.gem_dir, 'lib', 'code.rb'
     FileUtils.mkdir_p File.dirname code_rb
@@ -1544,6 +1558,14 @@ dependencies: []
     refute_equal @a1.hash, @a2.hash
   end
 
+  def test_installed_by_version
+    assert_equal v(0), @a1.installed_by_version
+
+    @a1.installed_by_version = Gem.rubygems_version
+
+    assert_equal Gem.rubygems_version, @a1.installed_by_version
+  end
+
   def test_base_dir
     assert_equal @gemhome, @a1.base_dir
   end
@@ -1841,6 +1863,7 @@ end
     @a2.add_runtime_dependency 'b', '1'
     @a2.dependencies.first.instance_variable_set :@type, nil
     @a2.required_rubygems_version = Gem::Requirement.new '> 0'
+    @a2.installed_by_version = Gem.rubygems_version
 
     # cached specs do not have spec.files populated:
     ruby_code = @a2.to_ruby_for_cache
@@ -1863,6 +1886,8 @@ Gem::Specification.new do |s|
   s.rubygems_version = "#{Gem::VERSION}"
   s.summary = "this is a summary"
 
+  s.installed_by_version = "#{Gem::VERSION}"
+
   if s.respond_to? :specification_version then
     s.specification_version = #{Gem::Specification::CURRENT_SPECIFICATION_VERSION}