Expose ec -> backtrace (internal) and use it to implement fiber backtrace.

See <https://bugs.ruby-lang.org/issues/16815> for more details.

1 files changed, 22 insertions, 0 deletions

diff --git a/test/fiber/test_backtrace.rb b/test/fiber/test_backtrace.rb
new file mode 100644
index 0000000000..2d637c09c8
--- /dev/null
+++ b/test/fiber/test_backtrace.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+require 'test/unit'
+require 'fiber'
+
+class TestFiberBacktrace < Test::Unit::TestCase
+  def test_backtrace
+    backtrace = Fiber.current.backtrace
+    assert_kind_of Array, backtrace
+    assert_match /test_backtrace/, backtrace[0]
+  end
+
+  def test_backtrace_locations
+    backtrace = Fiber.current.backtrace_locations
+    assert_kind_of Array, backtrace
+    assert_match /test_backtrace_locations/, backtrace[1].label
+  end
+
+  def test_local_backtrace
+    backtrace = Fiber.current.backtrace(2)
+    assert_equal backtrace, caller
+  end
+end