1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/range/to_set_spec.rb b/spec/ruby/core/range/to_set_spec.rb
new file mode 100644
index 0000000000..ac81d2cc4b
--- /dev/null
+++ b/spec/ruby/core/range/to_set_spec.rb
@@ -0,0 +1,54 @@
+require_relative '../../spec_helper'
+require_relative '../enumerable/fixtures/classes'
+
+describe "Range#to_set" do
+  it "returns a new Set created from self" do
+    (1..4).to_set.should == Set[1, 2, 3, 4]
+    (1...4).to_set.should == Set[1, 2, 3]
+  end
+
+  it "passes down passed blocks" do
+    (1..3).to_set { |x| x * x }.should == Set[1, 4, 9]
+  end
+
+  it "raises a TypeError for a beginningless range" do
+    -> {
+      (..0).to_set
+    }.should.raise(TypeError, "can't iterate from NilClass")
+  end
+
+  ruby_version_is "4.0" do
+    it "raises a RangeError if the range is endless" do
+      -> { (1..).to_set }.should.raise(RangeError, "cannot convert endless range to a set")
+      -> { (1...).to_set }.should.raise(RangeError, "cannot convert endless range to a set")
+    end
+  end
+
+  context "given positional arguments" do
+    ruby_version_is ""..."4.0" do
+      it "instantiates an object of provided as the first argument set class" do
+        set = (1..3).to_set(EnumerableSpecs::SetSubclass)
+        set.should.is_a?(EnumerableSpecs::SetSubclass)
+        set.to_a.sort.should == [1, 2, 3]
+      end
+    end
+
+    ruby_version_is "4.0"..."4.1" do
+      it "instantiates an object of provided as the first argument set class and warns" do
+        -> {
+          set = (1..3).to_set(EnumerableSpecs::SetSubclass)
+          set.should.is_a?(EnumerableSpecs::SetSubclass)
+          set.to_a.sort.should == [1, 2, 3]
+        }.should complain(/warning: passing arguments to Enumerable#to_set is deprecated/)
+      end
+    end
+
+    ruby_version_is "4.1" do
+      it "does not accept any positional argument" do
+        -> {
+          (1..3).to_set(EnumerableSpecs::SetSubclass)
+        }.should.raise(ArgumentError, "wrong number of arguments (given 1, expected 0)")
+      end
+    end
+  end
+end