Add spec for String concatenation task

Author: paulgoetze

3_Strings/1_Interpolation/solution_spec.rb

@@ -42,6 +42,7 @@ def interpolation_part_of(actual)
     interpolation.first
   end
 end
+
 describe "Your code" do
   [['solution::code']]
 

3_Strings/2_Concatenating_Strings/solution_spec.rb

@@ -1,5 +1,51 @@
 require 'rspec'
+require 'rspec/expectations'
+
+RSpec::Matchers.define :use_multiplication_of_strings do
+  match { |actual| actual =~ /['"]o['"]\s?\*\s?\d+/ }
+
+  failure_message do |actual|
+    %Q{Your code doesn't use the * method to add the "o"s}
+  end
+end
+
+RSpec::Matchers.define :concat_the_ordinal_number do |expected|
+  match { |actual| actual =~ /(<<[\(\s]?#{expected}\)?|\.concat[\(\s]#{expected}\(?)/ }
+
+  failure_message do |actual|
+    %Q{Your code doesn't add "#{expected.chr}" by using the ordinal number}
+  end
+end
+
+def code_line
+  %q{[['solution::code']]}
+end
+
+def code
+  @code ||= eval(code_line)
+end
 
 describe 'Your code' do
+  it 'creates a String' do
+    expect(code).to be_a String
+  end
+
+  it 'adds whitespace by using the ordinal number' do
+    expect(code_line).to concat_the_ordinal_number 32
+  end
+
+  it 'uses the * method to create the "ooooo"' do
+    expect(code_line).to use_multiplication_of_strings
+  end
+
+  it 'adds an exclamation mark by using the ordinal number' do
+    expect(code_line).to concat_the_ordinal_number 33
+  end
+
 
+  if code.is_a?(String)
+    it 'forms the String "Ruby rooooocks!"' do
+      expect(code.strip).to eq 'Ruby rooooocks!'
+    end
+  end
 end