1 files changed, 100 insertions, 0 deletions
diff --git a/spec/rubyspec/core/time/plus_spec.rb b/spec/rubyspec/core/time/plus_spec.rb
new file mode 100644
index 0000000000..29931f8a87
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+++ b/spec/rubyspec/core/time/plus_spec.rb
@@ -0,0 +1,100 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Time#+" do
+  it "increments the time by the specified amount" do
+    (Time.at(0) + 100).should == Time.at(100)
+  end
+
+  it "is a commutative operator" do
+    (Time.at(1.1) + 0.9).should == Time.at(0.9) + 1.1
+  end
+
+  it "adds a negative Float" do
+    t = Time.at(100) + -1.3
+    t.usec.should == 699999
+    t.to_i.should == 98
+  end
+
+  it "raises a TypeError if given argument is a coercible String" do
+    lambda { Time.now + "1" }.should raise_error(TypeError)
+    lambda { Time.now + "0.1" }.should raise_error(TypeError)
+    lambda { Time.now + "1/3" }.should raise_error(TypeError)
+  end
+
+  it "increments the time by the specified amount as rational numbers" do
+    (Time.at(Rational(11, 10)) + Rational(9, 10)).should == Time.at(2)
+  end
+
+  it "accepts arguments that can be coerced into Rational" do
+    (obj = mock_numeric('10')).should_receive(:to_r).and_return(Rational(10))
+    (Time.at(100) + obj).should == Time.at(110)
+  end
+
+  it "raises TypeError on argument that can't be coerced into Rational" do
+    lambda { Time.now + Object.new }.should raise_error(TypeError)
+    lambda { Time.now + "stuff" }.should raise_error(TypeError)
+  end
+
+  it "returns a UTC time if self is UTC" do
+    (Time.utc(2012) + 10).utc?.should == true
+  end
+
+  it "returns a non-UTC time if self is non-UTC" do
+    (Time.local(2012) + 10).utc?.should == false
+  end
+
+  it "returns a time with the same fixed offset as self" do
+    (Time.new(2012, 1, 1, 0, 0, 0, 3600) + 10).utc_offset.should == 3600
+  end
+
+  it "does not return a subclass instance" do
+    c = Class.new(Time)
+    x = c.now + 1
+    x.should be_an_instance_of(Time)
+  end
+
+  it "raises TypeError on Time argument" do
+    lambda { Time.now + Time.now }.should raise_error(TypeError)
+  end
+
+  it "raises TypeError on nil argument" do
+    lambda { Time.now + nil }.should raise_error(TypeError)
+  end
+
+  #see [ruby-dev:38446]
+  it "tracks microseconds" do
+    time = Time.at(0)
+    time += Rational(123_456, 1_000_000)
+    time.usec.should == 123_456
+    time += Rational(654_321, 1_000_000)
+    time.usec.should == 777_777
+  end
+
+  it "tracks nanoseconds" do
+    time = Time.at(0)
+    time += Rational(123_456_789, 1_000_000_000)
+    time.nsec.should == 123_456_789
+    time += Rational(876_543_210, 1_000_000_000)
+    time.nsec.should == 999_999_999
+  end
+
+  it "maintains precision" do
+    t = Time.at(0) + Rational(8_999_999_999_999_999, 1_000_000_000_000_000)
+    t.should_not == Time.at(9)
+  end
+
+  it "maintains microseconds precision" do
+    time = Time.at(0) + Rational(8_999_999_999_999_999, 1_000_000_000_000_000)
+    time.usec.should == 999_999
+  end
+
+  it "maintains nanoseconds precision" do
+    time = Time.at(0) + Rational(8_999_999_999_999_999, 1_000_000_000_000_000)
+    time.nsec.should == 999_999_999
+  end
+
+  it "maintains subseconds precision" do
+    time = Time.at(0) + Rational(8_999_999_999_999_999, 1_000_000_000_000_000)
+    time.subsec.should == Rational(999_999_999_999_999, 1_000_000_000_000_000)
+  end
+end