Add more color code tests

[no changelog]

src/main/kotlin/moe/nea/firmament/util/textutil.kt

@@ -93,7 +93,7 @@ fun CharSequence.removeColorCodes(keepNonColorCodes: Boolean = false): String {
 }
 
 val Text.unformattedString: String
-    get() = string.removeColorCodes().toString()
+    get() = string.removeColorCodes()
 
 
 fun Text.transformEachRecursively(function: (Text) -> Text): Text {

src/test/kotlin/moe/nea/firmament/test/ColorCode.kt

@@ -25,4 +25,39 @@ class ColorCode {
         Assertions.assertEquals("b§lc§l", "§ab§l§§c§l".removeColorCodes(true).toString())
         Assertions.assertEquals("§lb§lc", "§l§ab§l§§c".removeColorCodes(true).toString())
     }
+
+    @Test
+    fun testEdging() {
+        Assertions.assertEquals("", "§".removeColorCodes())
+        Assertions.assertEquals("a", "a§".removeColorCodes())
+        Assertions.assertEquals("b", "§ab§".removeColorCodes())
+    }
+
+    @Test
+    fun `testDouble§`() {
+        Assertions.assertEquals("1", "§§1".removeColorCodes())
+    }
+
+    @Test
+    fun testKeepNonColor() {
+        Assertions.assertEquals("§k§l§m§n§o§r", "§k§l§m§f§n§o§r".removeColorCodes(true))
+    }
+
+    @Test
+    fun testPlainString() {
+        Assertions.assertEquals("bcdefgp", "bcdefgp".removeColorCodes())
+        Assertions.assertEquals("", "".removeColorCodes())
+    }
+
+    @Test
+    fun testSomeNormalTestCases() {
+        Assertions.assertEquals(
+            "You are not currently in a party.",
+            "§r§cYou are not currently in a party.§r".removeColorCodes()
+        )
+        Assertions.assertEquals(
+            "Ancient Necron's Chestplate ✪✪✪✪",
+            "§dAncient Necron's Chestplate §6✪§6✪§6✪§6✪".removeColorCodes()
+        )
+    }
 }