Implement GC.{measure_total_time, total_time} and update GC.stat to update provided hash

Author: bjfish

core/gc/measure_total_time_spec.rb

@@ -0,0 +1,19 @@
+require_relative '../../spec_helper'
+
+ruby_version_is "3.1" do
+  describe "GC.measure_total_time" do
+    before :each do
+      @default = GC.measure_total_time
+    end
+
+    after :each do
+      GC.measure_total_time = @default
+    end
+
+    it "can set and get a boolean value" do
+      original = GC.measure_total_time
+      GC.measure_total_time = !original
+      GC.measure_total_time.should == !original
+    end
+  end
+end

core/gc/stat_spec.rb

@@ -51,4 +51,12 @@
     GC.stat(:total_allocated_objects).should be_kind_of(Integer)
     GC.stat[:total_allocated_objects].should be_kind_of(Integer)
   end
+
+  it "raises an error if argument is not nil, a symbol, or a hash" do
+    -> { GC.stat(7) }.should raise_error(TypeError, "non-hash or symbol given")
+  end
+
+  it "raises an error if an unknown key is given" do
+    -> { GC.stat(:foo) }.should raise_error(ArgumentError, "unknown key: foo")
+  end
 end

core/gc/total_time_spec.rb

@@ -0,0 +1,15 @@
+require_relative '../../spec_helper'
+
+ruby_version_is "3.1" do
+  describe "GC.total_time" do
+    it "returns an Integer" do
+      GC.total_time.should be_kind_of(Integer)
+    end
+
+    it "increases as collections are run" do
+      time_before = GC.total_time
+      GC.start
+      GC.total_time.should > time_before
+    end
+  end
+end