1 files changed, 73 insertions, 0 deletions
diff --git a/spec/ruby/library/bigdecimal/to_s_spec.rb b/spec/ruby/library/bigdecimal/to_s_spec.rb
new file mode 100644
index 0000000000..b97311c800
--- /dev/null
+++ b/spec/ruby/library/bigdecimal/to_s_spec.rb
@@ -0,0 +1,73 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'bigdecimal'
+
+describe "BigDecimal#to_s" do
+
+  before :each do
+    @bigdec_str = "3.14159265358979323846264338327950288419716939937"
+    @bigneg_str = "-3.1415926535897932384626433832795028841971693993"
+    @bigdec = BigDecimal(@bigdec_str)
+    @bigneg = BigDecimal(@bigneg_str)
+  end
+
+  it "return type is of class String" do
+    @bigdec.to_s.kind_of?(String).should == true
+    @bigneg.to_s.kind_of?(String).should == true
+  end
+
+  it "the default format looks like 0.xxxxEnn" do
+    @bigdec.to_s.should =~ /^0\.[0-9]*E[0-9]*$/i
+  end
+
+  it "takes an optional argument" do
+    lambda {@bigdec.to_s("F")}.should_not raise_error()
+  end
+
+  it "starts with + if + is supplied and value is positive" do
+    @bigdec.to_s("+").should =~ /^\+.*/
+    @bigneg.to_s("+").should_not =~ /^\+.*/
+  end
+
+  it "inserts a space every n chars, if integer n is supplied" do
+    re =\
+      /\A0\.314 159 265 358 979 323 846 264 338 327 950 288 419 716 939 937E1\z/i
+    @bigdec.to_s(3).should =~ re
+
+    str1 = '-123.45678 90123 45678 9'
+    BigDecimal.new("-123.45678901234567890").to_s('5F').should ==  str1
+    # trailing zeroes removed
+    BigDecimal.new("1.00000000000").to_s('1F').should == "1.0"
+    # 0 is treated as no spaces
+    BigDecimal.new("1.2345").to_s('0F').should == "1.2345"
+  end
+
+  it "can return a leading space for values > 0" do
+    @bigdec.to_s(" F").should =~ /\ .*/
+    @bigneg.to_s(" F").should_not =~ /\ .*/
+  end
+
+  it "removes trailing spaces in floating point notation" do
+    BigDecimal.new('-123.45678901234567890').to_s('F').should == "-123.4567890123456789"
+    BigDecimal.new('1.2500').to_s('F').should == "1.25"
+    BigDecimal.new('0000.00000').to_s('F').should == "0.0"
+    BigDecimal.new('-00.000010000').to_s('F').should == "-0.00001"
+    BigDecimal.new("5.00000E-2").to_s("F").should == "0.05"
+
+    BigDecimal.new("500000").to_s("F").should == "500000.0"
+    BigDecimal.new("5E2").to_s("F").should == "500.0"
+    BigDecimal.new("-5E100").to_s("F").should == "-5" + "0" * 100 + ".0"
+  end
+
+  it "can use engineering notation" do
+    @bigdec.to_s("E").should =~ /^0\.[0-9]*E[0-9]*$/i
+  end
+
+  it "can use conventional floating point notation" do
+    @bigdec.to_s("F").should == @bigdec_str
+    @bigneg.to_s("F").should == @bigneg_str
+    str2 = "+123.45678901 23456789"
+    BigDecimal.new('123.45678901234567890').to_s('+8F').should == str2
+  end
+
+end
+