Raise exceptions on invalid user params

pedometer/models/user.rb

@@ -7,30 +7,18 @@ class User
   attr_reader :gender, :height, :stride
 
   def initialize(gender = nil, height = nil, stride = nil)
-    @gender = gender.to_s.downcase if GENDER.include? gender.to_s.downcase
-    # @height = height.to_f if height.to_f > 0
-    # @stride = (stride.to_f > 0) ? stride.to_f : calculate_stride
-    @height = float_or_default(height, nil, 0)
-    @stride = float_or_default(stride, calculate_stride, 0)
-  end
+    @gender = gender.to_s.downcase unless gender.to_s.empty?
+    @height = height.to_f unless height.to_s.empty?
+    @stride = stride.to_f unless stride.to_s.empty?
 
-private
+    raise('Invalid gender') if @gender && !GENDER.include?(@gender)
+    raise('Invalid height') if @height && (@height <= 0)
+    raise('Invalid stride') if @stride && (@stride <= 0)
 
-  def float_or_default(val, default, greater_than_val)
-    float = Float(val)
-    (float > greater_than_val) ? float : default
-  rescue ArgumentError, TypeError
-    default
+    @stride ||= calculate_stride
   end
 
-  # def float_or_default(val, default, greater_than_val)
-  #   float = val.to_f
-  #   if (float.to_s == val.to_s || float.to_s.gsub('.0', '') == val.to_s)
-  #     (float > greater_than_val) ? float : default
-  #   else
-  #     default
-  #   end
-  # end
+private
 
   def calculate_stride
     if gender && height

pedometer/test/unit/user_test.rb

@@ -7,8 +7,8 @@ def test_create
     user = User.new('male', 167.5, 80)
 
     assert_equal 'male', user.gender
-    assert_equal 167.5, user.height
-    assert_equal 80, user.stride
+    assert_equal 167.5,  user.height
+    assert_equal 80,     user.stride
   end
 
   def test_create_no_params
@@ -19,27 +19,31 @@ def test_create_no_params
     assert_equal 74, user.stride
   end
 
-  def test_create_bad_params
-    user = User.new('bad params')
+  def test_create_with_gender
+    assert_nil User.new.gender
+    assert_nil User.new(nil).gender
+    assert_nil User.new('').gender
 
-    assert_nil user.gender
-    assert_nil user.height
-    assert_equal 74, user.stride
-  end
+    ['invalid gender', 1].each do |gender|
+      assert_raise_with_message(RuntimeError, 'Invalid gender') do
+        User.new(gender)
+      end
+    end
 
-  def test_create_with_gender
     assert_equal 'female', User.new('Female').gender
     assert_equal 'male',   User.new('MALE').gender
-
-    assert_nil User.new('invalid value').gender
-    assert_nil User.new(1).gender
   end
 
   def test_create_with_height
     assert_nil User.new(nil).height
     assert_nil User.new(nil, nil).height
     assert_nil User.new(nil, '').height
-    assert_nil User.new(nil, 'bad height').height
+
+    ['invalid height', 0, '0', -1, '-1'].each do |height|
+      assert_raise_with_message(RuntimeError, 'Invalid height') do
+        User.new(nil, height)
+      end
+    end
 
     assert_equal 150, User.new(nil, 150).height
     assert_equal 150, User.new(nil, '150').height
@@ -49,25 +53,30 @@ def test_create_with_height
     assert_equal 167.5, User.new(nil, '167.5').height
     assert_equal 181.12, User.new(nil, 181.12).height
     assert_equal 181.12, User.new(nil, '181.12').height
-
-    assert_nil User.new(nil, 0).height
-    assert_nil User.new(nil, '0').height
-    assert_nil User.new(nil, -1).height
-    assert_nil User.new(nil, '-1').height
-  end
-
-  def test_create_with_height_and_gender
-    assert_equal 0.415, User.new('male', 1).stride
-    assert_equal 0.413, User.new('female', 1).stride
   end
 
   def test_create_with_stride
     assert_equal 74, User.new.stride
-    assert_equal 74, User.new(nil, nil, 'bad stride').stride
-    assert_equal 74, User.new(nil, nil, -1).stride
+    assert_equal 74, User.new(nil, nil, nil).stride
+    assert_equal 74, User.new(nil, nil, '').stride
+
+    ['invalid stride', 0, '0', -1, '-1'].each do |stride|
+      assert_raise_with_message(RuntimeError, 'Invalid stride') do
+        User.new(nil, nil, stride)
+      end
+    end
 
+    assert_equal 80,    User.new(nil, nil, 80).stride
     assert_equal 80,    User.new(nil, nil, '80').stride
+    assert_equal 80,    User.new(nil, nil, 80.0).stride
+    assert_equal 80,    User.new(nil, nil, '80.0').stride
     assert_equal 75.25, User.new(nil, nil, 75.25).stride
+    assert_equal 75.25, User.new(nil, nil, '75.25').stride
+  end
+
+  def test_create_with_height_and_gender
+    assert_equal 0.415, User.new('male', 1).stride
+    assert_equal 0.413, User.new('female', 1).stride
   end
 
   def test_calculate_stride
@@ -80,19 +89,4 @@ def test_calculate_stride
     assert_equal 82.6, User.new('female', 200).stride
   end
 
-  def test_for_chapter
-    User.new.stride
-    # => 74
-    User.new('Female').stride
-    # => 70
-    User.new(nil, '167.5').stride
-    # => 69.345
-    User.new('male', 191).stride
-    # => 79.265
-    User.new(nil, nil, '80').stride
-    # => 80.0
-    User.new('female', 1, '72').stride
-    # => 72.0
-  end
-
 end