added tests for ParseMode

src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/ParseMode/ParseMode.kt

@@ -29,8 +29,7 @@ typealias HTML = HTMLParseMode
 @Serializer(ParseMode::class)
 internal object ParseModeSerializerObject : KSerializer<ParseMode> {
     override fun deserialize(decoder: Decoder): ParseMode {
-        val mode = decoder.decodeString()
+        return when (decoder.decodeString()) {
-        return when (mode) {
             MarkdownParseMode.parseModeName -> MarkdownParseMode
             HTMLParseMode.parseModeName -> HTMLParseMode
             else -> throw IllegalArgumentException("Unknown parse mode")

src/test/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/ChatIdentifierTests.kt

@@ -71,7 +71,7 @@ class ChatIdentifierTests {
         // username without starting @ symbol
         Example(testUsername.toUsername()).let { withUsername ->
             val stringified = Json.plain.stringify(Example.serializer(), withUsername).replace("@", "")
-            assertEquals(stringified, "{\"identifier\":\"${testUsername.replace("@", "")}\"}")
+            assertEquals("{\"identifier\":\"${testUsername.replace("@", "")}\"}", stringified)
             val deserialized = Json.plain.parse(Example.serializer(), stringified)
             assertEquals(withUsername, deserialized)
         }

src/test/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/ParseModeTests.kt

@@ -0,0 +1,38 @@
+package com.github.insanusmokrassar.TelegramBotAPI.types
+
+import com.github.insanusmokrassar.TelegramBotAPI.types.ParseMode.*
+import kotlinx.serialization.ImplicitReflectionSerializer
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+@ImplicitReflectionSerializer
+class ParseModeTests {
+    @Serializable
+    data class Example(
+        val mode: ParseMode
+    )
+
+    @Test
+    fun `Markdown parse mode correctly serializing and deserializing`() {
+        val example = Example(Markdown)
+
+        val stringified = Json.plain.stringify(Example.serializer(), example)
+        assertEquals("{\"mode\":\"Markdown\"}", stringified)
+
+        val deserialized = Json.plain.parse(Example.serializer(), stringified)
+        assertEquals(example, deserialized)
+    }
+
+    @Test
+    fun `HTML parse mode correctly serializing and deserializing`() {
+        val example = Example(HTML)
+
+        val stringified = Json.plain.stringify(Example.serializer(), example)
+        assertEquals("{\"mode\":\"HTML\"}", stringified)
+
+        val deserialized = Json.plain.parse(Example.serializer(), stringified)
+        assertEquals(example, deserialized)
+    }
+}