fix of #9

bot/src/test/kotlin/dev/inmo/plagubot/config/ConfigTest.kt

@@ -0,0 +1,37 @@
+package dev.inmo.plagubot.config
+
+import dev.inmo.plagubot.HelloPlugin
+import kotlinx.serialization.InternalSerializationApi
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class ConfigTest {
+    @InternalSerializationApi
+    @Test
+    fun testThatPluginPassedToParamsWillBeCorrectlyUsedInPlugins() {
+        val rawConfig = """
+            {
+              "database": {
+              },
+              "botToken": "",
+              "plugins": [
+                "helloPlugin"
+              ],
+              "params": {
+                "helloPlugin": {"type": "dev.inmo.plagubot.HelloPlugin", "parameter": "Example"}
+              }
+            }
+        """.trimIndent()
+        val config = configJsonFormat.decodeFromString(ConfigSerializer, rawConfig)
+
+        assert(config.plugins.size == 1)
+        assert(config.plugins.first() is HelloPlugin)
+        assert((config.plugins.first() as HelloPlugin).parameter == "Example")
+
+        val redecoded = configJsonFormat.decodeFromString(ConfigSerializer, configJsonFormat.encodeToString(ConfigSerializer, config))
+        assertEquals(config.database, redecoded.database)
+        assertEquals(config.plugins, redecoded.plugins)
+        assertEquals(config.botToken, redecoded.botToken)
+        assertEquals(config.params ?.toMap(), redecoded.params ?.toMap())
+    }
+}