1 files changed, 24 insertions, 0 deletions
diff --git a/spec/rubyspec/library/stringscanner/exist_spec.rb b/spec/rubyspec/library/stringscanner/exist_spec.rb
new file mode 100644
index 0000000000..ff13de89df
--- /dev/null
+++ b/spec/rubyspec/library/stringscanner/exist_spec.rb
@@ -0,0 +1,24 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'strscan'
+
+describe "StringScanner#exist?" do
+  before :each do
+    @s = StringScanner.new("This is a test")
+  end
+
+  it "returns the index of the first occurrence of the given pattern" do
+    @s.exist?(/s/).should == 4
+    @s.scan(/This is/)
+    @s.exist?(/s/).should == 6
+  end
+
+  it "returns 0 if the pattern is empty" do
+    @s.exist?(//).should == 0
+  end
+
+  it "returns nil if the pattern isn't found in the string" do
+    @s.exist?(/S/).should == nil
+    @s.scan(/This is/)
+    @s.exist?(/i/).should == nil
+  end
+end