Introduce separate test for the 3-ary border call in CSS API

web/core/src/jsTest/kotlin/StaticComposableTests.kt

@@ -1,8 +1,6 @@
 package org.jetbrains.compose.web.core.tests
 
-import org.jetbrains.compose.web.css.Color
 import org.jetbrains.compose.web.css.Position
-import org.jetbrains.compose.web.css.border
 import org.jetbrains.compose.web.css.bottom
 import org.jetbrains.compose.web.css.color
 import org.jetbrains.compose.web.css.left

web/core/src/jsTest/kotlin/css/CSSBorderTests.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.compose.web.core.tests.css
 
+import kotlinx.browser.window
 import org.jetbrains.compose.web.core.tests.runTest
 import org.jetbrains.compose.web.css.*
 import org.jetbrains.compose.web.dom.Div
@@ -23,13 +24,21 @@ class CSSBorderTests {
         }
 
         assertEquals("1px solid red", (root.children[0] as HTMLElement).style.border)
-        root.children[1]?.let {
-            val el = it.unsafeCast<HTMLElement>()
+        (root.children[1] as HTMLElement).let { el ->
             assertEquals("green", el.style.getPropertyValue("border-color"))
             assertEquals("3px", el.style.getPropertyValue("border-width"))
         }
     }
 
+    @Test
+    fun borderThreeValues() = runTest {
+        composition {
+            Div({ style { border(3.px, LineStyle.Dotted, Color("green")) } })
+        }
+
+        assertEquals("3px dotted green", (root.children[0] as HTMLElement).style.border)
+    }
+
     @Test
     fun borderRadius() = runTest {
         composition {