Added my solution

Gemfile

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+source 'https://rubygems.org'
+ruby '2.0.0'
+
+gem 'rspec', '~> 3.0.0.beta2'

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    diff-lcs (1.3)
+    rspec (3.0.0)
+      rspec-core (~> 3.0.0)
+      rspec-expectations (~> 3.0.0)
+      rspec-mocks (~> 3.0.0)
+    rspec-core (3.0.4)
+      rspec-support (~> 3.0.0)
+    rspec-expectations (3.0.4)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.0.0)
+    rspec-mocks (3.0.4)
+      rspec-support (~> 3.0.0)
+    rspec-support (3.0.4)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rspec (~> 3.0.0.beta2)
+
+RUBY VERSION
+   ruby 2.0.0p648
+
+BUNDLED WITH
+   1.14.6

lib/frequency_map.rb

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+class FrequencyMap
+
+    attr_reader :text
+    attr_reader :sorted
+
+    def initialize(text)
+        @text = text
+        @frequencies = Hash.new(0)
+    end
+
+    def getFrequencies()
+        @frequencies = Hash.new(0)
+        words = @text.split(" ")
+
+        words.each do |word|
+
+            # Remove special chars and convert to lowercase
+            word = word.downcase.gsub(/[^0-9a-z ]/i, '')
+
+            if @frequencies.keys.include? word
+                @frequencies[word] += 1
+            else
+                @frequencies[word] = 1
+            end
+
+        end
+
+        @frequencies
+    end
+
+    def sortFrequencies
+        self.getFrequencies
+
+        @sorted = @frequencies.sort_by { |key, value| value}.reverse
+    end
+
+    def printFrequencies
+        self.getFrequencies
+        self.sortFrequencies
+
+        @sorted.each do |pair|
+            word =  pair[0]
+            freq = pair[1]
+
+            p "#{freq} - #{word}"
+
+        end
+
+
+    end
+end

run.rb

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+require_relative 'lib/frequency_map'
+
+text = File.open("speech.txt").read
+frequencyMap = FrequencyMap.new(text)
+frequencyMap.printFrequencies

spec/frequency_map_spec.rb

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+require 'rspec'
+require 'frequency_map'
+
+describe FrequencyMap do
+
+    it 'should be a Class' do
+        expect(described_class.is_a? Class).to be true
+    end
+
+    it 'should return its set text' do
+        set_text = "test"
+        frequencyMap = FrequencyMap.new(set_text)
+        expect(frequencyMap.text).to eq set_text
+    end
+
+    it 'should return a hash of type string->int when computing frequencies' do
+        set_text = "dog dog cat mouse mouse mouse"
+        frequencyMap = FrequencyMap.new(set_text)
+        frequencies = frequencyMap.getFrequencies()
+
+        expect(frequencies.is_a? Hash).to be true
+        expect(frequencies.keys).to all( be_a(String))
+        expect(frequencies.values).to all( be_a(Integer))
+    end
+
+    it 'should return correct frequencies for a normal case' do
+        set_text = "dog dog cat mouse mouse mouse"
+        frequencyMap = FrequencyMap.new(set_text)
+        frequencies = frequencyMap.getFrequencies()
+
+        expect(frequencies["dog"]).to eq 2
+        expect(frequencies["cat"]).to eq 1
+        expect(frequencies["mouse"]).to eq 3
+        expect(frequencies["lion"]).to eq 0
+    end
+
+    it 'should return no frequencies for an empty case' do
+        set_text = ""
+        frequencyMap = FrequencyMap.new(set_text)
+        frequencies = frequencyMap.getFrequencies()
+
+        expect(frequencies.size).to eq 0
+    end
+
+    it 'should sort frequencies for a normal case' do
+        set_text = "dog dog cat mouse mouse mouse"
+        frequencyMap = FrequencyMap.new(set_text)
+        frequencyMap.sortFrequencies
+
+        expect(frequencyMap.sorted[0]).to eq ["mouse", 3]
+        expect(frequencyMap.sorted[1]).to eq ["dog", 2]
+        expect(frequencyMap.sorted[2]).to eq ["cat", 1]
+    end
+
+    it 'should return an empty array for an empty case' do
+        set_text = ""
+        frequencyMap = FrequencyMap.new(set_text)
+        frequencyMap.sortFrequencies
+
+        expect(frequencyMap.sorted).to be_empty
+    end
+
+    it 'should print sorted frequencies for a normal case' do
+        set_text = "dog dog cat mouse mouse mouse"
+        frequencyMap = FrequencyMap.new(set_text)
+        expect(frequencyMap.printFrequencies()).to output("Hello!").to_stdout
+    end
+
+end