1 files changed, 120 insertions, 0 deletions
diff --git a/spec/ruby/core/float/to_s_spec.rb b/spec/ruby/core/float/to_s_spec.rb
new file mode 100644
index 0000000000..e76cfc1b7e
--- /dev/null
+++ b/spec/ruby/core/float/to_s_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Float#to_s" do
+  it "returns 'NaN' for NaN" do
+    nan_value().to_s.should == 'NaN'
+  end
+
+  it "returns 'Infinity' for positive infinity" do
+    infinity_value().to_s.should == 'Infinity'
+  end
+
+  it "returns '-Infinity' for negative infinity" do
+    (-infinity_value()).to_s.should == '-Infinity'
+  end
+
+  it "returns '0.0' for 0.0" do
+    0.0.to_s.should == "0.0"
+  end
+
+  platform_is_not :openbsd do
+    it "emits '-' for -0.0" do
+      -0.0.to_s.should == "-0.0"
+    end
+  end
+
+  it "emits a '-' for negative values" do
+    -3.14.to_s.should == "-3.14"
+  end
+
+  it "emits a trailing '.0' for a whole number" do
+    50.0.to_s.should == "50.0"
+  end
+
+  it "emits a trailing '.0' for the mantissa in e format" do
+    1.0e20.to_s.should == "1.0e+20"
+  end
+
+  it "uses non-e format for a positive value with fractional part having 5 significant figures" do
+    0.0001.to_s.should == "0.0001"
+  end
+
+  it "uses non-e format for a negative value with fractional part having 5 significant figures" do
+    -0.0001.to_s.should == "-0.0001"
+  end
+
+  it "uses e format for a positive value with fractional part having 6 significant figures" do
+    0.00001.to_s.should == "1.0e-05"
+  end
+
+  it "uses e format for a negative value with fractional part having 6 significant figures" do
+    -0.00001.to_s.should == "-1.0e-05"
+  end
+
+  it "uses non-e format for a positive value with whole part having 15 significant figures" do
+    10000000000000.0.to_s.should == "10000000000000.0"
+  end
+
+  it "uses non-e format for a negative value with whole part having 15 significant figures" do
+    -10000000000000.0.to_s.should == "-10000000000000.0"
+  end
+
+  it "uses non-e format for a positive value with whole part having 16 significant figures" do
+    100000000000000.0.to_s.should == "100000000000000.0"
+  end
+
+  it "uses non-e format for a negative value with whole part having 16 significant figures" do
+    -100000000000000.0.to_s.should == "-100000000000000.0"
+  end
+
+  it "uses e format for a positive value with whole part having 18 significant figures" do
+    10000000000000000.0.to_s.should == "1.0e+16"
+  end
+
+  it "uses e format for a negative value with whole part having 18 significant figures" do
+    -10000000000000000.0.to_s.should == "-1.0e+16"
+  end
+
+  it "uses non-e format for a positive value with whole part having 17 significant figures" do
+    1000000000000000.0.to_s.should == "1.0e+15"
+  end
+
+  it "uses non-e format for a negative value with whole part having 17 significant figures" do
+    -1000000000000000.0.to_s.should == "-1.0e+15"
+  end
+
+  # #3273
+  it "outputs the minimal, unique form necessary to recreate the value" do
+    value = 0.21611564636388508
+    string = "0.21611564636388508"
+
+    value.to_s.should == string
+    string.to_f.should == value
+  end
+
+  it "outputs the minimal, unique form to represent the value" do
+    0.56.to_s.should == "0.56"
+  end
+end
+
+with_feature :encoding do
+  describe "Float#to_s" do
+    before :each do
+      @internal = Encoding.default_internal
+    end
+
+    after :each do
+      Encoding.default_internal = @internal
+    end
+
+    it "returns a String in US-ASCII encoding when Encoding.default_internal is nil" do
+      Encoding.default_internal = nil
+      1.23.to_s.encoding.should equal(Encoding::US_ASCII)
+    end
+
+    it "returns a String in US-ASCII encoding when Encoding.default_internal is not nil" do
+      Encoding.default_internal = Encoding::IBM437
+      5.47.to_s.encoding.should equal(Encoding::US_ASCII)
+    end
+  end
+end