Restore checks for calculating each stat only once

exercises/practice/dnd-character/dnd-character_spec.lua

@@ -122,6 +122,7 @@ describe('dnd', function()
       assert.equal("integer", math.type(strength))
       assert.lteq(3, strength)
       assert.lteq(strength, 18)
+      assert.equal(strength, character.strength)
     end)
 
     it('creates a character with valid dexterity', function()
@@ -130,6 +131,7 @@ describe('dnd', function()
       assert.equal("integer", math.type(dexterity))
       assert.lteq(3, dexterity)
       assert.lteq(dexterity, 18)
+      assert.equal(dexterity, character.dexterity)
     end)
 
     it('creates a character with valid constitution', function()
@@ -138,6 +140,7 @@ describe('dnd', function()
       assert.equal("integer", math.type(constitution))
       assert.lteq(3, constitution)
       assert.lteq(constitution, 18)
+      assert.equal(constitution, character.constitution)
     end)
 
     it('creates a character with valid intelligence', function()
@@ -146,6 +149,7 @@ describe('dnd', function()
       assert.equal("integer", math.type(intelligence))
       assert.lteq(3, intelligence)
       assert.lteq(intelligence, 18)
+      assert.equal(intelligence, character.intelligence)
     end)
 
     it('creates a character with valid wisdom', function()
@@ -154,6 +158,7 @@ describe('dnd', function()
       assert.equal("integer", math.type(wisdom))
       assert.lteq(3, wisdom)
       assert.lteq(wisdom, 18)
+      assert.equal(wisdom, character.wisdom)
     end)
 
     it('creates a character with valid charisma', function()
@@ -162,6 +167,7 @@ describe('dnd', function()
       assert.equal("integer", math.type(charisma))
       assert.lteq(3, charisma)
       assert.lteq(charisma, 18)
+      assert.equal(charisma, character.charisma)
     end)
 
     it('creates a character with valid hitpoints', function()