1 files changed, 39 insertions, 0 deletions
diff --git a/spec/ruby/core/env/select_spec.rb b/spec/ruby/core/env/select_spec.rb
new file mode 100644
index 0000000000..8261ff593a
--- /dev/null
+++ b/spec/ruby/core/env/select_spec.rb
@@ -0,0 +1,39 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../../enumerable/shared/enumeratorized', __FILE__)
+
+describe "ENV.select!" do
+  it "removes environment variables for which the block returns true" do
+    ENV["foo"] = "bar"
+    ENV.select! { |k, v| k != "foo" }
+    ENV["foo"].should == nil
+  end
+
+  it "returns self if any changes were made" do
+    ENV["foo"] = "bar"
+    ENV.select! { |k, v| k != "foo" }.should == ENV
+  end
+
+  it "returns nil if no changes were made" do
+    ENV.select! { true }.should == nil
+  end
+
+  it "returns an Enumerator if called without a block" do
+    ENV.select!.should be_an_instance_of(Enumerator)
+  end
+
+  it_behaves_like :enumeratorized_with_origin_size, :select!, ENV
+end
+
+describe "ENV.select" do
+  it "returns a Hash of names and values for which block return true" do
+    ENV["foo"] = "bar"
+    ENV.select { |k, v| k == "foo" }.should == {"foo" => "bar"}
+    ENV.delete "foo"
+  end
+
+  it "returns an Enumerator when no block is given" do
+    ENV.select.should be_an_instance_of(Enumerator)
+  end
+
+  it_behaves_like :enumeratorized_with_origin_size, :select, ENV
+end