1 files changed, 47 insertions, 0 deletions
diff --git a/spec/ruby/library/openstruct/method_missing_spec.rb b/spec/ruby/library/openstruct/method_missing_spec.rb
new file mode 100644
index 0000000000..6051fd48d8
--- /dev/null
+++ b/spec/ruby/library/openstruct/method_missing_spec.rb
@@ -0,0 +1,47 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require "ostruct"
+
+describe "OpenStruct#method_missing when called with a method name ending in '='" do
+  before :each do
+    @os = OpenStruct.new
+  end
+
+  it "raises an ArgumentError when not passed any additional arguments" do
+    lambda { @os.method_missing(:test=) }.should raise_error(ArgumentError)
+  end
+
+  it "raises a TypeError when self is frozen" do
+    @os.freeze
+    lambda { @os.method_missing(:test=, "test") }.should raise_error(RuntimeError)
+  end
+
+  it "creates accessor methods" do
+    @os.method_missing(:test=, "test")
+    @os.respond_to?(:test=).should be_true
+    @os.respond_to?(:test).should be_true
+
+    @os.test.should == "test"
+    @os.test = "changed"
+    @os.test.should == "changed"
+  end
+
+  it "updates the method/value table with the passed method/value" do
+    @os.method_missing(:test=, "test")
+    @os.send(:table)[:test].should == "test"
+  end
+end
+
+describe "OpenStruct#method_missing when passed additional arguments" do
+  it "raises a NoMethodError" do
+    os = OpenStruct.new
+    lambda { os.method_missing(:test, 1, 2, 3) }.should raise_error(NoMethodError)
+  end
+end
+
+describe "OpenStruct#method_missing when not passed any additional arguments" do
+  it "returns the value for the passed method from the method/value table" do
+    os = OpenStruct.new(age: 20)
+    os.method_missing(:age).should eql(20)
+    os.method_missing(:name).should be_nil
+  end
+end