moves Class#reachable? to Module#reachable?, bases implementation on anonymous? and constantize, and adds test coverage

1 files changed, 41 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/module/reachable_test.rb b/activesupport/test/core_ext/module/reachable_test.rb
new file mode 100644
index 0000000000..72892b77d5
--- /dev/null
+++ b/activesupport/test/core_ext/module/reachable_test.rb
@@ -0,0 +1,41 @@
+require 'abstract_unit'
+require 'active_support/core_ext/module/reachable'
+
+class AnonymousTest < ActiveSupport::TestCase
+  test "an anonymous class or module is not reachable" do
+    assert !Module.new.reachable?
+    assert !Class.new.reachable?
+  end
+  
+  test "ordinary named classes or modules are reachable" do
+    assert Kernel.reachable?
+    assert Object.reachable?
+  end
+  
+  test "a named class or module whose constant has gone is not reachable" do
+    c = eval "class C; end; C"
+    m = eval "module M; end; M"
+    
+    self.class.send(:remove_const, :C)
+    self.class.send(:remove_const, :M)
+    
+    assert !c.reachable?
+    assert !m.reachable?
+  end
+  
+  test "a named class or module whose constants store different objects are not reachable" do
+    c = eval "class C; end; C"
+    m = eval "module M; end; M"
+    
+    self.class.send(:remove_const, :C)
+    self.class.send(:remove_const, :M)    
+
+    eval "class C; end"
+    eval "module M; end"
+    
+    assert C.reachable?
+    assert M.reachable?
+    assert !c.reachable?
+    assert !m.reachable?
+  end
+end
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