1 files changed, 33 insertions, 0 deletions
diff --git a/spec/ruby/core/thread/backtrace_locations_spec.rb b/spec/ruby/core/thread/backtrace_locations_spec.rb
new file mode 100644
index 0000000000..66947f8ea6
--- /dev/null
+++ b/spec/ruby/core/thread/backtrace_locations_spec.rb
@@ -0,0 +1,33 @@
+require_relative '../../spec_helper'
+
+describe "Thread#backtrace_locations" do
+  it "returns an Array" do
+    locations = Thread.current.backtrace_locations
+    locations.should be_an_instance_of(Array)
+    locations.should_not be_empty
+  end
+
+  it "sets each element to a Thread::Backtrace::Location" do
+    locations = Thread.current.backtrace_locations
+    locations.each { |loc| loc.should be_an_instance_of(Thread::Backtrace::Location) }
+  end
+
+  it "can be called on any Thread" do
+    locations = Thread.new { Thread.current.backtrace_locations }.value
+    locations.should be_an_instance_of(Array)
+    locations.should_not be_empty
+    locations.each { |loc| loc.should be_an_instance_of(Thread::Backtrace::Location) }
+  end
+
+  it "without argument is the same as showing all locations with 0..-1" do
+    Thread.current.backtrace_locations.map(&:to_s).should == Thread.current.backtrace_locations(0..-1).map(&:to_s)
+  end
+
+  it "the first location reports the call to #backtrace_locations" do
+    Thread.current.backtrace_locations(0..0)[0].to_s.should == "#{__FILE__ }:#{__LINE__ }:in `backtrace_locations'"
+  end
+
+  it "[1..-1] is the same as #caller_locations(0..-1) for Thread.current" do
+    Thread.current.backtrace_locations(1..-1).map(&:to_s).should == caller_locations(0..-1).map(&:to_s)
+  end
+end