1 files changed, 33 insertions, 0 deletions
diff --git a/spec/ruby/core/env/keep_if_spec.rb b/spec/ruby/core/env/keep_if_spec.rb
new file mode 100644
index 0000000000..c5bbc3dc05
--- /dev/null
+++ b/spec/ruby/core/env/keep_if_spec.rb
@@ -0,0 +1,33 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../../enumerable/shared/enumeratorized', __FILE__)
+
+describe "ENV.keep_if" do
+  before :each do
+    ENV["foo"] = "bar"
+  end
+
+  after :each do
+    ENV.delete "foo"
+  end
+
+  it "deletes pairs if the block returns false" do
+    ENV.keep_if { |k, v| k != "foo" }
+    ENV["foo"].should == nil
+  end
+
+  it "returns ENV even if nothing deleted" do
+    ENV.keep_if { true }.should_not == nil
+  end
+
+  it "returns an Enumerator if no block given" do
+    ENV.keep_if.should be_an_instance_of(Enumerator)
+  end
+
+  it "deletes pairs through enumerator" do
+    enum = ENV.keep_if
+    enum.each { |k, v| k != "foo" }
+    ENV["foo"].should == nil
+  end
+
+  it_behaves_like :enumeratorized_with_origin_size, :keep_if, ENV
+end