1 files changed, 42 insertions, 0 deletions
diff --git a/spec/ruby/core/env/rassoc_spec.rb b/spec/ruby/core/env/rassoc_spec.rb
new file mode 100644
index 0000000000..e4ac5ce5e2
--- /dev/null
+++ b/spec/ruby/core/env/rassoc_spec.rb
@@ -0,0 +1,42 @@
+require_relative '../../spec_helper'
+
+describe "ENV.rassoc" do
+  before :each do
+    @foo = ENV["foo"]
+    @baz = ENV["baz"]
+  end
+
+  after :each do
+    ENV["foo"] = @foo
+    ENV["baz"] = @baz
+  end
+
+  it "returns an array of the key and value of the environment variable with the given value" do
+    ENV["foo"] = "bar"
+    ENV.rassoc("bar").should == ["foo", "bar"]
+  end
+
+  it "returns a single array even if there are multiple such environment variables" do
+    ENV["foo"] = "bar"
+    ENV["baz"] = "bar"
+    [
+        ["foo", "bar"],
+        ["baz", "bar"],
+    ].should.include?(ENV.rassoc("bar"))
+  end
+
+  it "returns nil if no environment variable with the given value exists" do
+    ENV.rassoc("bar").should == nil
+  end
+
+  it "returns the value element coerced with #to_str" do
+    ENV["foo"] = "bar"
+    v = mock('value')
+    v.should_receive(:to_str).and_return("bar")
+    ENV.rassoc(v).should == ["foo", "bar"]
+  end
+
+  it "returns nil if the argument is not a String and does not respond to #to_str" do
+    ENV.rassoc(Object.new).should == nil
+  end
+end