1 files changed, 53 insertions, 0 deletions
diff --git a/spec/ruby/core/string/to_c_spec.rb b/spec/ruby/core/string/to_c_spec.rb
new file mode 100644
index 0000000000..9cd0ed4401
--- /dev/null
+++ b/spec/ruby/core/string/to_c_spec.rb
@@ -0,0 +1,53 @@
+require_relative '../../spec_helper'
+require_relative '../../shared/kernel/complex'
+require_relative 'fixtures/to_c'
+
+describe "String#to_c" do
+  it_behaves_like :kernel_complex, :to_c_method, StringSpecs
+end
+
+describe "String#to_c" do
+  it "returns a complex number with 0 as the real part, 0 as the imaginary part for unrecognised Strings" do
+    'ruby'.to_c.should == Complex(0, 0)
+  end
+
+  it "ignores trailing garbage" do
+    '79+4iruby'.to_c.should == Complex(79, 4)
+    '7__9+4__0i'.to_c.should == Complex(7, 0)
+  end
+
+  context "it treats special float value strings as characters" do
+    it "parses any string that starts with 'I' as 1i" do
+      'Infinity'.to_c.should == Complex(0, 1)
+      '-Infinity'.to_c.should == Complex(0, -1)
+      'Insecure'.to_c.should == Complex(0, 1)
+      '-Insecure'.to_c.should == Complex(0, -1)
+    end
+
+    it "does not parse any numeric information in 'NaN'" do
+      'NaN'.to_c.should == Complex(0, 0)
+    end
+  end
+
+  it "allows null-byte" do
+    "1-2i\0".to_c.should == Complex(1, -2)
+    "1\0-2i".to_c.should == Complex(1, 0)
+    "\01-2i".to_c.should == Complex(0, 0)
+  end
+
+  it "raises Encoding::CompatibilityError if String is in not ASCII-compatible encoding" do
+    -> {
+      '79+4i'.encode("UTF-16").to_c
+    }.should.raise(Encoding::CompatibilityError, "ASCII incompatible encoding: UTF-16")
+  end
+
+  it "treats a sequence of underscores as an end of Complex string" do
+    "5+3_1i".to_c.should == Complex(5, 31)
+    "5+3__1i".to_c.should == Complex(5)
+    "5+3___1i".to_c.should == Complex(5)
+
+    "12_3".to_c.should == Complex(123)
+    "12__3".to_c.should == Complex(12)
+    "12___3".to_c.should == Complex(12)
+  end
+end