Add specs for coercion with BigDecimal

Author: eregon

spec/ruby/library/bigdecimal/add_spec.rb

@@ -73,6 +73,14 @@
 #    BigDecimal("0.88").add(0.0, 1).should == BigDecimal("0.9")
 #  end
 
+  describe "with Object" do
+    it "tries to coerce the other operand to self" do
+      object = mock("Object")
+      object.should_receive(:coerce).with(@frac_3).and_return([@frac_3, @frac_4])
+      @frac_3.add(object, 1).should == BigDecimal("0.1E16")
+    end
+  end
+
   it "favors the precision specified in the second argument over the global limit" do
     BigDecimalSpecs.with_limit(1) do
       BigDecimal('0.888').add(@zero, 3).should == BigDecimal('0.888')

spec/ruby/library/bigdecimal/div_spec.rb

@@ -42,6 +42,14 @@
     }
   end
 
+  describe "with Object" do
+    it "tries to coerce the other operand to self" do
+      object = mock("Object")
+      object.should_receive(:coerce).with(@one).and_return([@one, @two])
+      @one.div(object).should == @zero
+    end
+  end
+
   it "raises FloatDomainError if NaN is involved" do
     lambda { @one.div(@nan) }.should raise_error(FloatDomainError)
     lambda { @nan.div(@one) }.should raise_error(FloatDomainError)

spec/ruby/library/bigdecimal/mult_spec.rb

@@ -9,7 +9,8 @@
 describe "BigDecimal#mult" do
   before :each do
     @one = BigDecimal "1"
-    @e3_minus = BigDecimal "3E-20001"
+    @e3_minus = BigDecimal("3E-20001")
+    @e3_plus = BigDecimal("3E20001")
     @e = BigDecimal "1.00000000000000000000123456789"
     @tolerance = @e.sub @one, 1000
     @tolerance2 = BigDecimal "30001E-20005"
@@ -21,4 +22,11 @@
     @e3_minus.mult(@one, 1).should be_close(0, @tolerance2)
   end
 
+  describe "with Object" do
+    it "tries to coerce the other operand to self" do
+      object = mock("Object")
+      object.should_receive(:coerce).with(@e3_minus).and_return([@e3_minus, @e3_plus])
+      @e3_minus.mult(object, 1).should == BigDecimal("9")
+    end
+  end
 end

spec/ruby/library/bigdecimal/multiply_spec.rb

@@ -23,4 +23,12 @@
     (@e3_minus * @e3_minus).should == BigDecimal("9E-40002")
     (@e * @one).should == @e
   end
+
+  describe "with Object" do
+    it "tries to coerce the other operand to self" do
+      object = mock("Object")
+      object.should_receive(:coerce).with(@e3_minus).and_return([@e3_minus, @e3_plus])
+      (@e3_minus * object).should == BigDecimal("9")
+    end
+  end
 end

spec/ruby/library/bigdecimal/remainder_spec.rb

@@ -5,7 +5,8 @@
 
   before :each do
     @zero = BigDecimal("0")
-    @one = BigDecimal("0")
+    @one = BigDecimal("1")
+    @three = BigDecimal("3")
     @mixed = BigDecimal("1.23456789")
     @pos_int = BigDecimal("2E5555")
     @neg_int = BigDecimal("-2E5555")
@@ -71,9 +72,16 @@
   end
 
   it "coerces arguments to BigDecimal if possible" do
-    @one.remainder(2).should == @one
+    @three.remainder(2).should == @one
   end
 
+  describe "with Object" do
+    it "tries to coerce the other operand to self" do
+      object = mock("Object")
+      object.should_receive(:coerce).with(@three).and_return([@three, 2])
+      @three.remainder(object).should == @one
+    end
+  end
 
   it "raises TypeError if the argument cannot be coerced to BigDecimal" do
     lambda {

spec/ruby/library/bigdecimal/shared/modulo.rb

@@ -70,6 +70,15 @@
     res.kind_of?(BigDecimal).should == true
   end
 
+  describe "with Object" do
+    it "tries to coerce the other operand to self" do
+      bd6543 = BigDecimal("6543.21")
+      object = mock("Object")
+      object.should_receive(:coerce).with(bd6543).and_return([bd6543, 137])
+      bd6543.send(@method, object, *@object).should == BigDecimal("104.21")
+    end
+  end
+
   it "returns NaN if NaN is involved" do
     @nan.send(@method, @nan).nan?.should == true
     @nan.send(@method, @one).nan?.should == true

spec/ruby/library/bigdecimal/shared/quo.rb

@@ -29,6 +29,14 @@
     @one.send(@method, BigDecimal('2E-5555'), *@object).should == BigDecimal('0.5E5555')
   end
 
+  describe "with Object" do
+    it "tries to coerce the other operand to self" do
+      object = mock("Object")
+      object.should_receive(:coerce).with(@one).and_return([@one, @two])
+      @one.send(@method, object, *@object).should == BigDecimal("0.5")
+    end
+  end
+
   it "returns 0 if divided by Infinity" do
     @zero.send(@method, @infinity, *@object).should == 0
     @frac_2.send(@method, @infinity, *@object).should == 0

spec/ruby/library/bigdecimal/sub_spec.rb

@@ -13,6 +13,8 @@
     @one_minus = BigDecimal("-1")
     @frac_1 = BigDecimal("1E-99999")
     @frac_2 = BigDecimal("0.9E-99999")
+    @frac_3 = BigDecimal("12345E10")
+    @frac_4 = BigDecimal("98765E10")
   end
 
   it "returns a - b with given precision" do
@@ -32,6 +34,14 @@
     @frac_1.sub(@frac_1, 1000000).should == @zero
   end
 
+  describe "with Object" do
+    it "tries to coerce the other operand to self" do
+      object = mock("Object")
+      object.should_receive(:coerce).with(@frac_3).and_return([@frac_3, @frac_4])
+      @frac_3.sub(object, 1).should == BigDecimal("-0.9E15")
+    end
+  end
+
   it "returns NaN if NaN is involved" do
     @one.sub(@nan, 1).nan?.should == true
     @nan.sub(@one, 1).nan?.should == true