Simplify color utils and fix tests, resolves #156

1 files changed, 18 insertions, 0 deletions

diff --git a/core/src/test/kotlin/ca/allanwang/kau/utils/UtilsTest.kt b/core/src/test/kotlin/ca/allanwang/kau/utils/UtilsTest.kt
index 1cce9ae..b9c200a 100644
--- a/core/src/test/kotlin/ca/allanwang/kau/utils/UtilsTest.kt
+++ b/core/src/test/kotlin/ca/allanwang/kau/utils/UtilsTest.kt
@@ -32,6 +32,24 @@ class UtilsTest {
     }
 
     @Test
+    fun colorWithAlpha() {
+        val origColor = 0xFF123456.toInt()
+        assertEquals(0x00123456, origColor.withAlpha(0), "Failed to convert with alpha 0")
+        assertEquals(0x50123456, origColor.withAlpha(80), "Failed to convert with alpha 80")
+        assertEquals(0xFF123456.toInt(), origColor.withAlpha(255), "Failed to convert with alpha 255")
+        assertEquals(0xFF123456.toInt(), origColor.withAlpha(0xFF), "Failed to convert with alpha 0xFF")
+        assertEquals(Color.TRANSPARENT, Color.BLACK.withAlpha(0), "Failed to convert black to transparent")
+    }
+
+    @Test
+    fun colorWithMinAlpha() {
+        val origColor = 0x80123456.toInt()
+        assertEquals(origColor, origColor.withMinAlpha(0), "Failed to convert with min alpha 0")
+        assertEquals(0xFA123456.toInt(), origColor.withMinAlpha(0xFA), "Failed to convert with min alpha 0xFA")
+        assertEquals(Color.BLUE, Color.BLUE.withMinAlpha(89), "Failed to convert blue with min alpha 89")
+    }
+
+    @Test
     fun rounding() {
         assertEquals("1.23", 1.23456f.round(2))
         assertEquals("22.466", 22.465920439.round(3))