1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/fetch_spec.rb b/spec/ruby/core/hash/fetch_spec.rb
new file mode 100644
index 0000000000..5e701b1162
--- /dev/null
+++ b/spec/ruby/core/hash/fetch_spec.rb
@@ -0,0 +1,36 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Hash#fetch" do
+  it "returns the value for key" do
+    { a: 1, b: -1 }.fetch(:b).should == -1
+  end
+
+  it "raises a KeyError if key is not found" do
+    lambda { {}.fetch(:a)       }.should raise_error(KeyError)
+    lambda { Hash.new(5).fetch(:a)    }.should raise_error(KeyError)
+    lambda { Hash.new { 5 }.fetch(:a) }.should raise_error(KeyError)
+  end
+
+  it "returns default if key is not found when passed a default" do
+    {}.fetch(:a, nil).should == nil
+    {}.fetch(:a, 'not here!').should == "not here!"
+    { a: nil }.fetch(:a, 'not here!').should == nil
+  end
+
+  it "returns value of block if key is not found when passed a block" do
+    {}.fetch('a') { |k| k + '!' }.should == "a!"
+  end
+
+  it "gives precedence to the default block over the default argument when passed both" do
+    lambda {
+      @result = {}.fetch(9, :foo) { |i| i * i }
+    }.should complain(/block supersedes default value argument/)
+    @result.should == 81
+  end
+
+  it "raises an ArgumentError when not passed one or two arguments" do
+    lambda { {}.fetch()        }.should raise_error(ArgumentError)
+    lambda { {}.fetch(1, 2, 3) }.should raise_error(ArgumentError)
+  end
+end