1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/library/random/formatter/alphanumeric_spec.rb b/spec/ruby/library/random/formatter/alphanumeric_spec.rb
new file mode 100644
index 0000000000..62a4698d0d
--- /dev/null
+++ b/spec/ruby/library/random/formatter/alphanumeric_spec.rb
@@ -0,0 +1,54 @@
+require_relative '../../../spec_helper'
+
+require 'random/formatter'
+
+describe "Random::Formatter#alphanumeric" do
+  before :each do
+    @object = Object.new
+    @object.extend(Random::Formatter)
+    @object.define_singleton_method(:bytes) do |n|
+      "\x00".b * n
+    end
+  end
+
+  it "generates a random alphanumeric string" do
+    @object.alphanumeric.should =~ /\A[A-Za-z0-9]+\z/
+  end
+
+  it "has a default size of 16 characters" do
+    @object.alphanumeric.size.should == 16
+  end
+
+  it "accepts a 'size' argument" do
+    @object.alphanumeric(10).size.should == 10
+  end
+
+  it "uses the default size if 'nil' is given as size argument" do
+    @object.alphanumeric(nil).size.should == 16
+  end
+
+  it "raises an ArgumentError if the size is not numeric" do
+    -> {
+      @object.alphanumeric("10")
+    }.should.raise(ArgumentError)
+  end
+
+  it "does not coerce the size argument with #to_int" do
+    size = mock("size")
+    size.should_not_receive(:to_int)
+    -> {
+      @object.alphanumeric(size)
+    }.should.raise(ArgumentError)
+  end
+
+  it "accepts a 'chars' argument with the output alphabet" do
+    @object.alphanumeric(chars: ['a', 'b']).should =~ /\A[ab]+\z/
+  end
+
+  it "converts the elements of chars using #to_s" do
+    to_s = mock("to_s")
+    to_s.should_receive(:to_s).and_return("[mock to_s]")
+    # Using 1 value in chars results in an infinite loop
+    @object.alphanumeric(1, chars: [to_s, to_s]).should == "[mock to_s]"
+  end
+end