Merge pull request #1040 from AI-Mozi/add_specs_for_thread_each_caller_location

Add specs for `Thread.each_caller_location`

Author: andrykonchin

core/thread/each_caller_location_spec.rb

@@ -0,0 +1,55 @@
+require_relative '../../spec_helper'
+
+describe "Thread.each_caller_location" do
+  ruby_version_is "3.2" do
+    it "iterates through the current execution stack and matches caller_locations content and type" do
+      ScratchPad.record []
+      Thread.each_caller_location { |l| ScratchPad << l; }
+
+      ScratchPad.recorded.map(&:to_s).should == caller_locations.map(&:to_s)
+      ScratchPad.recorded[0].should be_kind_of(Thread::Backtrace::Location)
+    end
+
+    it "returns subset of 'Thread.to_enum(:each_caller_location)' locations" do
+      ar = []
+      ecl = Thread.each_caller_location { |x| ar << x }
+
+      (ar.map(&:to_s) - Thread.to_enum(:each_caller_location).to_a.map(&:to_s)).should.empty?
+    end
+
+    it "stops the backtrace iteration if 'break' occurs" do
+      i = 0
+      ar = []
+      ecl = Thread.each_caller_location do |x|
+        ar << x
+        i += 1
+        break x if i == 2
+      end
+
+      ar.map(&:to_s).should == caller_locations(1, 2).map(&:to_s)
+      ecl.should be_kind_of(Thread::Backtrace::Location)
+    end
+
+    it "returns nil" do
+      Thread.each_caller_location {}.should == nil
+    end
+
+    it "cannot be iterated with an external iterator" do
+      -> {
+        Thread.to_enum(:each_caller_location).next
+      }.should raise_error(StopIteration, "iteration reached an end")
+    end
+
+    it "raises LocalJumpError when called without a block" do
+      -> {
+        Thread.each_caller_location
+      }.should raise_error(LocalJumpError, "no block given")
+    end
+
+    it "doesn't accept positional and keyword arguments" do
+      -> {
+        Thread.each_caller_location(12, foo: 10) {}
+      }.should raise_error(ArgumentError, "wrong number of arguments (given 2, expected 0)")
+    end
+  end
+end