rspecs

lib/common/common_helper.rb

@@ -180,7 +180,9 @@ end
 
 # Truncates a string to a specific length and adds ... at the end
 def truncate(input, size, trailing = '...')
-  padded_length = size - trailing.length - 2 # ... + space + index 0
-  return input if input.nil? or size <= trailing.length or size <= 0 or input.length <= size
-  return "#{input[0...padded_length]}#{trailing}"
+  size = size.to_i
+  trailing ||= ''
+  return input if input.nil? or size <= 0 or input.length <= size or
+      trailing.length >= input.length or size-trailing.length-1 >= input.length
+  return "#{input[0..size-trailing.length-1]}#{trailing}"
 end

spec/lib/common/common_helper_spec.rb

@@ -88,4 +88,83 @@ describe 'common_helper' do
       @expected = @html
     end
   end
-end
+
+  describe '#truncate' do
+    after :each do
+      output = truncate(@input, @length, @trailing)
+      output.should == @expected
+    end
+
+    it 'returns nil on no input' do
+      @input = nil
+      @length = 1
+      @expected = nil
+      @trailing = '...'
+    end
+
+    it 'returns input when length > input' do
+      @input = '1234567890'
+      @length = 13
+      @expected = @input
+      @trailing = '...'
+    end
+
+    it 'truncates the input' do
+      @input = '1234567890'
+      @length = 6
+      @expected = '123...'
+      @trailing = '...'
+    end
+
+    it 'adds own trailing' do
+      @input = '1234567890'
+      @length = 7
+      @expected = '123xxxx'
+      @trailing = 'xxxx'
+    end
+
+    it 'accepts strings as length' do
+      @input = '1234567890'
+      @length = '6'
+      @expected = '123...'
+      @trailing = '...'
+    end
+
+    it 'checks if trailing is longer than input' do
+      @input = '1234567890'
+      @length = 1
+      @expected = @input
+      @trailing = 'A' * 20
+    end
+
+    it 'returns input on negative length' do
+      @input = '1234567890'
+      @length = -1
+      @expected = @input
+      @trailing = '...'
+    end
+
+    it 'returns input on length == input.length' do
+      @input = '1234567890'
+      @length = '10'
+      @expected = @input
+      @trailing = '...'
+    end
+
+    it 'returns cut string on nil trailing' do
+      @input = '1234567890'
+      @length = 9
+      @expected = '123456789'
+      @trailing = nil
+    end
+
+    it 'trailing.length > length' do
+      @input = '1234567890'
+      @length = 1
+      @expected = @input
+      @trailing = 'A' * 20
+    end
+
+  end
+
+end