Update to ruby/spec@83063a3

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62094 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/core/integer/divmod_spec.rb

@@ -0,0 +1,117 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Integer#divmod" do
+  context "fixnum" do
+    it "returns an Array containing quotient and modulus obtained from dividing self by the given argument" do
+      13.divmod(4).should == [3, 1]
+      4.divmod(13).should == [0, 4]
+
+      13.divmod(4.0).should == [3, 1]
+      4.divmod(13.0).should == [0, 4]
+
+      1.divmod(2.0).should == [0, 1.0]
+      200.divmod(bignum_value).should == [0, 200]
+    end
+
+    it "raises a ZeroDivisionError when the given argument is 0" do
+      lambda { 13.divmod(0)  }.should raise_error(ZeroDivisionError)
+      lambda { 0.divmod(0)   }.should raise_error(ZeroDivisionError)
+      lambda { -10.divmod(0) }.should raise_error(ZeroDivisionError)
+    end
+
+    it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
+      lambda { 0.divmod(0.0)   }.should raise_error(ZeroDivisionError)
+      lambda { 10.divmod(0.0)  }.should raise_error(ZeroDivisionError)
+      lambda { -10.divmod(0.0) }.should raise_error(ZeroDivisionError)
+    end
+
+    it "raises a TypeError when given a non-Integer" do
+      lambda {
+        (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+        13.divmod(obj)
+      }.should raise_error(TypeError)
+      lambda { 13.divmod("10")    }.should raise_error(TypeError)
+      lambda { 13.divmod(:symbol) }.should raise_error(TypeError)
+    end
+  end
+
+  context "bignum" do
+    before :each do
+      @bignum = bignum_value(55)
+    end
+
+    # Based on MRI's test/test_integer.rb (test_divmod),
+    # MRI maintains the following property:
+    # if q, r = a.divmod(b) ==>
+    # assert(0 < b ? (0 <= r && r < b) : (b < r && r <= 0))
+    # So, r is always between 0 and b.
+    it "returns an Array containing quotient and modulus obtained from dividing self by the given argument" do
+      @bignum.divmod(4).should == [2305843009213693965, 3]
+      @bignum.divmod(13).should == [709490156681136604, 11]
+
+      @bignum.divmod(4.5).should == [2049638230412172288, 3.5]
+
+      not_supported_on :opal do
+        @bignum.divmod(4.0).should == [2305843009213693952, 0.0]
+        @bignum.divmod(13.0).should == [709490156681136640, 8.0]
+
+        @bignum.divmod(2.0).should == [4611686018427387904, 0.0]
+      end
+
+      @bignum.divmod(bignum_value).should == [1, 55]
+
+      (-(10**50)).divmod(-(10**40 + 1)).should == [9999999999, -9999999999999999999999999999990000000001]
+      (10**50).divmod(10**40 + 1).should == [9999999999, 9999999999999999999999999999990000000001]
+
+      (-10**50).divmod(10**40 + 1).should == [-10000000000, 10000000000]
+      (10**50).divmod(-(10**40 + 1)).should == [-10000000000, -10000000000]
+    end
+
+    describe "with q = floor(x/y), a = q*b + r," do
+      it "returns [q,r] when a < 0, b > 0 and |a| < b" do
+        a = -@bignum + 1
+        b =  @bignum
+        a.divmod(b).should == [-1, 1]
+      end
+
+      it "returns [q,r] when a > 0, b < 0 and a > |b|" do
+        b = -@bignum + 1
+        a =  @bignum
+        a.divmod(b).should == [-2, -@bignum + 2]
+      end
+
+      it "returns [q,r] when a > 0, b < 0 and a < |b|" do
+        a =  @bignum - 1
+        b = -@bignum
+        a.divmod(b).should == [-1, -1]
+      end
+
+      it "returns [q,r] when a < 0, b < 0 and |a| < |b|" do
+        a = -@bignum + 1
+        b = -@bignum
+        a.divmod(b).should == [0, -@bignum + 1]
+      end
+    end
+
+    it "raises a ZeroDivisionError when the given argument is 0" do
+      lambda { @bignum.divmod(0) }.should raise_error(ZeroDivisionError)
+      lambda { (-@bignum).divmod(0) }.should raise_error(ZeroDivisionError)
+    end
+
+    # Behaviour established as correct in r23953
+    it "raises a FloatDomainError if other is NaN" do
+      lambda { @bignum.divmod(nan_value) }.should raise_error(FloatDomainError)
+    end
+
+    it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
+      lambda { @bignum.divmod(0.0) }.should raise_error(ZeroDivisionError)
+      lambda { (-@bignum).divmod(0.0) }.should raise_error(ZeroDivisionError)
+    end
+
+    it "raises a TypeError when the given argument is not an Integer" do
+      lambda { @bignum.divmod(mock('10')) }.should raise_error(TypeError)
+      lambda { @bignum.divmod("10") }.should raise_error(TypeError)
+      lambda { @bignum.divmod(:symbol) }.should raise_error(TypeError)
+    end
+  end
+end