1 files changed, 33 insertions, 0 deletions
diff --git a/spec/ruby/core/module/lte_spec.rb b/spec/ruby/core/module/lte_spec.rb
new file mode 100644
index 0000000000..c6aab94e9f
--- /dev/null
+++ b/spec/ruby/core/module/lte_spec.rb
@@ -0,0 +1,33 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Module#<=" do
+  it "returns true if self is a subclass of, the same as or includes the given module" do
+    (ModuleSpecs::Child  <= ModuleSpecs::Parent).should == true
+    (ModuleSpecs::Child  <= ModuleSpecs::Basic).should == true
+    (ModuleSpecs::Child  <= ModuleSpecs::Super).should == true
+    (ModuleSpecs::Super  <= ModuleSpecs::Basic).should == true
+    (ModuleSpecs::Child  <= ModuleSpecs::Child).should == true
+    (ModuleSpecs::Parent <= ModuleSpecs::Parent).should == true
+    (ModuleSpecs::Basic  <= ModuleSpecs::Basic).should == true
+    (ModuleSpecs::Super  <= ModuleSpecs::Super).should == true
+  end
+
+  it "returns nil if self is not related to the given module" do
+    (ModuleSpecs::Parent <= ModuleSpecs::Basic).should == nil
+    (ModuleSpecs::Parent <= ModuleSpecs::Super).should == nil
+    (ModuleSpecs::Basic  <= ModuleSpecs::Parent).should == nil
+    (ModuleSpecs::Super  <= ModuleSpecs::Parent).should == nil
+  end
+
+  it "returns false if self is a superclass of or is included by the given module" do
+    (ModuleSpecs::Parent <= ModuleSpecs::Child).should == false
+    (ModuleSpecs::Basic  <= ModuleSpecs::Child).should == false
+    (ModuleSpecs::Super  <= ModuleSpecs::Child).should == false
+    (ModuleSpecs::Basic  <= ModuleSpecs::Super).should == false
+  end
+
+  it "raises a TypeError if the argument is not a class/module" do
+    -> { ModuleSpecs::Parent <= mock('x') }.should.raise(TypeError)
+  end
+end