1 files changed, 53 insertions, 8 deletions
diff --git a/spec/ruby/core/kernel/caller_locations_spec.rb b/spec/ruby/core/kernel/caller_locations_spec.rb
index cb344e16a0..04cf806ef4 100644
--- a/spec/ruby/core/kernel/caller_locations_spec.rb
+++ b/spec/ruby/core/kernel/caller_locations_spec.rb
@@ -3,11 +3,11 @@ require_relative 'fixtures/caller_locations'
 
 describe 'Kernel#caller_locations' do
   it 'is a private method' do
-    Kernel.should have_private_instance_method(:caller_locations)
+    Kernel.private_instance_methods(false).should.include?(:caller_locations)
   end
 
   it 'returns an Array of caller locations' do
-    KernelSpecs::CallerLocationsTest.locations.empty?.should == false
+    KernelSpecs::CallerLocationsTest.locations.should_not.empty?
   end
 
   it 'returns an Array of caller locations using a custom offset' do
@@ -28,12 +28,16 @@ describe 'Kernel#caller_locations' do
     locations1[2..4].map(&:to_s).should == locations2.map(&:to_s)
   end
 
-  ruby_version_is "2.6" do
-    it "works with endless ranges" do
-      locations1 = caller_locations(0)
-      locations2 = caller_locations(eval("(2..)"))
-      locations2.map(&:to_s).should == locations1[2..-1].map(&:to_s)
-    end
+  it "works with endless ranges" do
+    locations1 = caller_locations(0)
+    locations2 = caller_locations(eval("(2..)"))
+    locations2.map(&:to_s).should == locations1[2..-1].map(&:to_s)
+  end
+
+  it "works with beginless ranges" do
+    locations1 = caller_locations(0)
+    locations2 = caller_locations((...5))
+    locations2.map(&:to_s)[eval("(2..)")].should == locations1[(...5)].map(&:to_s)[eval("(2..)")]
   end
 
   it "can be called with a range whose end is negative" do
@@ -65,4 +69,45 @@ describe 'Kernel#caller_locations' do
   it "must return the same locations when called with 1..-1 and when called with no arguments" do
     caller_locations.map(&:to_s).should == caller_locations(1..-1).map(&:to_s)
   end
+
+  guard -> { Kernel.instance_method(:tap).source_location } do
+    ruby_version_is ""..."3.4" do
+      it "includes core library methods defined in Ruby" do
+        file, line = Kernel.instance_method(:tap).source_location
+        file.should.start_with?('<internal:')
+
+        loc = nil
+        tap { loc = caller_locations(1, 1)[0] }
+        loc.label.should == "tap"
+        loc.path.should.start_with? "<internal:"
+      end
+    end
+
+    ruby_version_is "3.4"..."4.0" do
+      it "includes core library methods defined in Ruby" do
+        file, line = Kernel.instance_method(:tap).source_location
+        file.should.start_with?('<internal:')
+
+        loc = nil
+        tap { loc = caller_locations(1, 1)[0] }
+        loc.label.should == "Kernel#tap"
+        loc.path.should.start_with? "<internal:"
+      end
+    end
+
+    ruby_version_is "4.0" do
+      it "does not include core library methods defined in Ruby" do
+        file, line = Kernel.instance_method(:tap).source_location
+        file.should.start_with?('<internal:')
+
+        loc = nil
+        tap { loc = caller_locations(1, 1)[0] }
+        loc.label.should == "Kernel#tap"
+        # CRuby hides the file which defines the method: https://bugs.ruby-lang.org/issues/20968
+        unless loc.path == __FILE__
+          loc.path.should.start_with? "<internal:"
+        end
+      end
+    end
+  end
 end