spec/ruby/core/time/: Use near time for timezone test

`time_with_zone.zone.should == (time_with_zone - 60*60).zone` fails when the time is immediately before the change of summer time. https://rubyci.org/logs/rubyci.s3.amazonaws.com/unstable11s/ruby-master/log/20200328T232504Z.fail.html.gz ``` 1) Time#+ preserves time zone FAILED Expected "CET" == "CEST" to be truthy but was false ``` It is acceptable as it fails at most twice per year, but it would be good to use near time objects to reduce the possibility.

Author: mame

core/time/minus_spec.rb

@@ -92,17 +92,17 @@
 
  it "preserves time zone" do
  time_with_zone = Time.now.utc
- time_with_zone.zone.should == (time_with_zone - 60*60).zone
+ time_with_zone.zone.should == (time_with_zone - 1).zone
 
  time_with_zone = Time.now
- time_with_zone.zone.should == (time_with_zone - 60*60).zone
+ time_with_zone.zone.should == (time_with_zone - 1).zone
  end
 
  ruby_version_is "2.6" do
  context "zone is a timezone object" do
  it "preserves time zone" do
  zone = TimeSpecs::Timezone.new(offset: (5*3600+30*60))
- time = Time.new(2012, 1, 1, 12, 0, 0, zone) - 60*60
+ time = Time.new(2012, 1, 1, 12, 0, 0, zone) - 1
 
  time.zone.should == zone
  end

core/time/plus_spec.rb

@@ -50,17 +50,17 @@
 
  it "preserves time zone" do
  time_with_zone = Time.now.utc
- time_with_zone.zone.should == (time_with_zone + 60*60).zone
+ time_with_zone.zone.should == (time_with_zone + 1).zone
 
  time_with_zone = Time.now
- time_with_zone.zone.should == (time_with_zone + 60*60).zone
+ time_with_zone.zone.should == (time_with_zone + 1).zone
  end
 
  ruby_version_is "2.6" do
  context "zone is a timezone object" do
  it "preserves time zone" do
  zone = TimeSpecs::Timezone.new(offset: (5*3600+30*60))
- time = Time.new(2012, 1, 1, 12, 0, 0, zone) + 60*60
+ time = Time.new(2012, 1, 1, 12, 0, 0, zone) + 1
 
  time.zone.should == zone
  end

core/time/succ_spec.rb

@@ -30,7 +30,7 @@
  context "zone is a timezone object" do
  it "preserves time zone" do
  zone = TimeSpecs::Timezone.new(offset: (5*3600+30*60))
- time = Time.new(2012, 1, 1, 12, 0, 0, zone) - 60*60
+ time = Time.new(2012, 1, 1, 12, 0, 0, zone) - 1
 
  time.zone.should == zone
  end