Add `Time#ceil`.

Closes: https://github.com/ruby/ruby/pull/2133

1 files changed, 45 insertions, 0 deletions

diff --git a/spec/ruby/core/time/ceil_spec.rb b/spec/ruby/core/time/ceil_spec.rb
new file mode 100644
index 0000000000..29dcec5d72
--- /dev/null
+++ b/spec/ruby/core/time/ceil_spec.rb
@@ -0,0 +1,45 @@
+require_relative '../../spec_helper'
+
+ruby_version_is "2.7" do
+  describe "Time#ceil" do
+    before do
+      @time = Time.utc(2010, 3, 30, 5, 43, "25.0123456789".to_r)
+    end
+
+    it "defaults to ceiling to 0 places" do
+      @time.ceil.should == Time.utc(2010, 3, 30, 5, 43, 26.to_r)
+    end
+
+    it "ceils to 0 decimal places with an explicit argument" do
+      @time.ceil(0).should == Time.utc(2010, 3, 30, 5, 43, 26.to_r)
+    end
+
+    it "ceils to 2 decimal places with an explicit argument" do
+      @time.ceil(2).should == Time.utc(2010, 3, 30, 5, 43, "25.02".to_r)
+    end
+
+    it "ceils to 4 decimal places with an explicit argument" do
+      @time.ceil(4).should == Time.utc(2010, 3, 30, 5, 43, "25.0124".to_r)
+    end
+
+    it "ceils to 7 decimal places with an explicit argument" do
+      @time.ceil(7).should == Time.utc(2010, 3, 30, 5, 43, "25.0123457".to_r)
+    end
+
+    it "returns an instance of Time, even if #ceil is called on a subclass" do
+      subclass = Class.new(Time)
+      instance = subclass.at(0)
+      instance.class.should equal subclass
+      instance.ceil.should be_an_instance_of(Time)
+    end
+
+    it "copies own timezone to the returning value" do
+      @time.zone.should == @time.ceil.zone
+
+      with_timezone "JST-9" do
+        time = Time.at 0, 1
+        time.zone.should == time.ceil.zone
+      end
+    end
+  end
+end