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-rw-r--r--spec/ruby/core/integer/right_shift_spec.rb63
1 files changed, 52 insertions, 11 deletions
diff --git a/spec/ruby/core/integer/right_shift_spec.rb b/spec/ruby/core/integer/right_shift_spec.rb
index 6abcd8d714..e91613d8d1 100644
--- a/spec/ruby/core/integer/right_shift_spec.rb
+++ b/spec/ruby/core/integer/right_shift_spec.rb
@@ -52,17 +52,13 @@ describe "Integer#>> (with n >> m)" do
(-7 >> 64).should == -1
end
- it "returns 0 when m is a bignum" do
- (3 >> bignum_value).should == 0
- end
-
- it "returns an Bignum == fixnum_max * 2 when fixnum_max >> -1 and n > 0" do
+ it "returns a Bignum == fixnum_max * 2 when fixnum_max >> -1 and n > 0" do
result = fixnum_max >> -1
result.should be_an_instance_of(Integer)
result.should == fixnum_max * 2
end
- it "returns an Bignum == fixnum_min * 2 when fixnum_min >> -1 and n < 0" do
+ it "returns a Bignum == fixnum_min * 2 when fixnum_min >> -1 and n < 0" do
result = fixnum_min >> -1
result.should be_an_instance_of(Integer)
result.should == fixnum_min * 2
@@ -96,7 +92,7 @@ describe "Integer#>> (with n >> m)" do
context "bignum" do
before :each do
- @bignum = bignum_value * 16
+ @bignum = bignum_value * 8 # 2 ** 67
end
it "returns n shifted right m bits when n > 0, m > 0" do
@@ -153,10 +149,6 @@ describe "Integer#>> (with n >> m)" do
(@bignum >> 68).should == 0
end
- it "returns 0 when m is a Bignum" do
- (@bignum >> bignum_value).should == 0
- end
-
it "returns a Fixnum == fixnum_max when (fixnum_max * 2) >> 1 and n > 0" do
result = (fixnum_max * 2) >> 1
result.should be_an_instance_of(Integer)
@@ -191,4 +183,53 @@ describe "Integer#>> (with n >> m)" do
-> { @bignum >> "4" }.should raise_error(TypeError)
end
end
+
+ context "when m is a bignum or larger than int" do
+ it "returns -1 when m > 0 and n < 0" do
+ (-1 >> bignum_value).should == -1
+ (-1 >> (2**40)).should == -1
+
+ (-bignum_value >> bignum_value).should == -1
+ (-bignum_value >> (2**40)).should == -1
+ end
+
+ it "returns 0 when m > 0 and n >= 0" do
+ (0 >> bignum_value).should == 0
+ (1 >> bignum_value).should == 0
+ (bignum_value >> bignum_value).should == 0
+
+ (0 >> (2**40)).should == 0
+ (1 >> (2**40)).should == 0
+ (bignum_value >> (2**40)).should == 0
+ end
+
+ ruby_bug "#18517", ""..."3.2" do
+ it "returns 0 when m < 0 long and n == 0" do
+ (0 >> -(2**40)).should == 0
+ end
+ end
+
+ it "returns 0 when m < 0 bignum and n == 0" do
+ (0 >> -bignum_value).should == 0
+ end
+
+ it "raises RangeError when m < 0 and n != 0" do
+ # https://bugs.ruby-lang.org/issues/18518#note-9
+ limit = RUBY_ENGINE == 'ruby' ? 2**67 : 2**32
+
+ coerce_long = mock("long")
+ coerce_long.stub!(:to_int).and_return(-limit)
+ coerce_bignum = mock("bignum")
+ coerce_bignum.stub!(:to_int).and_return(-bignum_value)
+ exps = [-limit, coerce_long]
+ exps << -bignum_value << coerce_bignum if bignum_value >= limit
+
+ exps.each { |exp|
+ -> { (1 >> exp) }.should raise_error(RangeError, 'shift width too big')
+ -> { (-1 >> exp) }.should raise_error(RangeError, 'shift width too big')
+ -> { (bignum_value >> exp) }.should raise_error(RangeError, 'shift width too big')
+ -> { (-bignum_value >> exp) }.should raise_error(RangeError, 'shift width too big')
+ }
+ end
+ end
end