better unit check error

modules/Element.lua

@@ -348,19 +348,25 @@ function Element.new(props, deps)
 
   ------ add non-hereditary ------
   --- self drawing---
-  self.border = props.border
-      and {
+  -- Handle border (can be number or table)
+  if type(props.border) == "table" then
+    self.border = {
       top = props.border.top or false,
       right = props.border.right or false,
       bottom = props.border.bottom or false,
       left = props.border.left or false,
     }
-    or {
+  elseif props.border then
+    -- If border is a number or truthy value, keep it as-is
+    self.border = props.border
+  else
+    self.border = {
       top = false,
       right = false,
       bottom = false,
       left = false,
     }
+  end
   self.borderColor = props.borderColor or self._deps.Color.new(0, 0, 0, 1)
   self.backgroundColor = props.backgroundColor or self._deps.Color.new(0, 0, 0, 0)
 

modules/Units.lua

@@ -29,6 +29,15 @@ function Units.parse(value)
     return 0, "px"
   end
 
+  -- Check for unit-only input (e.g., "px", "%", "vw" without a number)
+  local validUnits = { px = true, ["%"] = true, vw = true, vh = true, ew = true, eh = true }
+  if validUnits[value] then
+    if ErrorHandler then
+      ErrorHandler.error("Units", string.format("Missing numeric value before unit '%s'. Use format like '50%s' (e.g., '50px', '10%%', '2vw')", value, value))
+    end
+    return 0, "px"
+  end
+
   -- Check for invalid format (space between number and unit)
   if value:match("%d%s+%a") then
     if ErrorHandler then
@@ -59,7 +68,7 @@ function Units.parse(value)
     unit = "px"
   end
 
-  local validUnits = { px = true, ["%"] = true, vw = true, vh = true, ew = true, eh = true }
+  -- validUnits is already defined at the top of the function
   if not validUnits[unit] then
     if ErrorHandler then
       ErrorHandler.error("Units", string.format("Unknown unit '%s' in '%s'. Valid units: px, %%, vw, vh, ew, eh", unit, value))

testing/__tests__/units_test.lua

@@ -89,28 +89,20 @@ function TestUnitsParse:testParseZero()
 end
 
 function TestUnitsParse:testParseInvalidType()
-  local value, unit = Units.parse(nil)
-  luaunit.assertEquals(value, 0)
-  luaunit.assertEquals(unit, "px")
+  luaunit.assertErrorMsgContains("Invalid unit value type", Units.parse, nil)
 end
 
 function TestUnitsParse:testParseInvalidString()
-  local value, unit = Units.parse("abc")
-  luaunit.assertEquals(value, 0)
-  luaunit.assertEquals(unit, "px")
+  luaunit.assertErrorMsgContains("Invalid unit format", Units.parse, "abc")
 end
 
 function TestUnitsParse:testParseInvalidUnit()
-  local value, unit = Units.parse("100xyz")
-  luaunit.assertEquals(value, 100)
-  luaunit.assertEquals(unit, "px") -- Falls back to px
+  luaunit.assertErrorMsgContains("Unknown unit", Units.parse, "100xyz")
 end
 
 function TestUnitsParse:testParseWithSpace()
   -- Spaces between number and unit should be invalid
-  local value, unit = Units.parse("100 px")
-  luaunit.assertEquals(value, 0)
-  luaunit.assertEquals(unit, "px")
+  luaunit.assertErrorMsgContains("contains space", Units.parse, "100 px")
 end
 
 -- Test suite for Units.resolve()
@@ -377,15 +369,11 @@ function TestUnitsEdgeCases:testResolveZeroParentSize()
 end
 
 function TestUnitsEdgeCases:testParseEmptyString()
-  local value, unit = Units.parse("")
-  luaunit.assertEquals(value, 0)
-  luaunit.assertEquals(unit, "px")
+  luaunit.assertErrorMsgContains("Invalid unit format", Units.parse, "")
 end
 
 function TestUnitsEdgeCases:testParseOnlyUnit()
-  local value, unit = Units.parse("px")
-  luaunit.assertEquals(value, 0)
-  luaunit.assertEquals(unit, "px")
+  luaunit.assertErrorMsgContains("Missing numeric value before unit", Units.parse, "px")
 end
 
 function TestUnitsEdgeCases:testResolveNegativePercentage()