Add `Time#floor`

[Feature #15653]
[Fix GH-2092]

From: manga_osyo <manga.osyo@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67632 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 37 insertions, 0 deletions

diff --git a/spec/ruby/core/time/floor_spec.rb b/spec/ruby/core/time/floor_spec.rb
new file mode 100644
index 0000000000..763ed1ba51
--- /dev/null
+++ b/spec/ruby/core/time/floor_spec.rb
@@ -0,0 +1,37 @@
+require_relative '../../spec_helper'
+
+ruby_version_is "2.7" do
+  describe "Time#floor" do
+    before do
+      @time = Time.utc(2010, 3, 30, 5, 43, "25.123456789".to_r)
+    end
+
+    it "defaults to flooring to 0 places" do
+      @time.floor.should == Time.utc(2010, 3, 30, 5, 43, 25.to_r)
+    end
+
+    it "floors to 0 decimal places with an explicit argument" do
+      @time.floor(0).should == Time.utc(2010, 3, 30, 5, 43, 25.to_r)
+    end
+
+    it "floors to 7 decimal places with an explicit argument" do
+      @time.floor(7).should == Time.utc(2010, 3, 30, 5, 43, "25.1234567".to_r)
+    end
+
+    it "returns an instance of Time, even if #floor is called on a subclass" do
+      subclass = Class.new(Time)
+      instance = subclass.at(0)
+      instance.class.should equal subclass
+      instance.floor.should be_an_instance_of(Time)
+    end
+
+    it "copies own timezone to the returning value" do
+      @time.zone.should == @time.floor.zone
+
+      with_timezone "JST-9" do
+        time = Time.at 0, 1
+        time.zone.should == time.floor.zone
+      end
+    end
+  end
+end