1 files changed, 40 insertions, 0 deletions
diff --git a/spec/rubyspec/library/set/flatten_spec.rb b/spec/rubyspec/library/set/flatten_spec.rb
new file mode 100644
index 0000000000..2fa7f9f6e5
--- /dev/null
+++ b/spec/rubyspec/library/set/flatten_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require 'set'
+
+describe "Set#flatten" do
+  it "returns a copy of self with each included Set flattened" do
+    set = Set[1, 2, Set[3, 4, Set[5, 6, Set[7, 8]]], 9, 10]
+    flattened_set = set.flatten
+
+    flattened_set.should_not equal(set)
+    flattened_set.should == Set[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+  end
+
+  it "raises an ArgumentError when self is recursive" do
+    (set = Set[]) << set
+    lambda { set.flatten }.should raise_error(ArgumentError)
+  end
+end
+
+describe "Set#flatten!" do
+  it "flattens self" do
+    set = Set[1, 2, Set[3, 4, Set[5, 6, Set[7, 8]]], 9, 10]
+    set.flatten!
+    set.should == Set[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+  end
+
+  it "returns self when self was modified" do
+    set = Set[1, 2, Set[3, 4]]
+    set.flatten!.should equal(set)
+  end
+
+  it "returns nil when self was not modified" do
+    set = Set[1, 2, 3, 4]
+    set.flatten!.should be_nil
+  end
+
+  it "raises an ArgumentError when self is recursive" do
+    (set = Set[]) << set
+    lambda { set.flatten! }.should raise_error(ArgumentError)
+  end
+end