fix: formatting

Author: alisa101rs

formats/json-tests/commonTest/src/kotlinx/serialization/json/MissingCommaTest.kt

@@ -9,7 +9,7 @@ import kotlinx.serialization.*
 import kotlinx.serialization.test.*
 import kotlin.test.*
 
-class MissingCommaTest: JsonTestBase() {
+class MissingCommaTest : JsonTestBase() {
     @Serializable
     class Holder(
         val i: Int,
@@ -68,7 +68,7 @@ class MissingCommaTest: JsonTestBase() {
     }
 
     @Test
-    fun missingCommaInDynamicMap(){
+    fun missingCommaInDynamicMap() {
         val m = "Unexpected JSON token at offset 9: Expected end of the object or comma at path: \$"
         val json = """{"i":42 "c":{"i":"string"}}"""
         assertFailsWithSerialMessage("JsonDecodingException", m) {
@@ -77,12 +77,22 @@ class MissingCommaTest: JsonTestBase() {
     }
 
     @Test
-    fun missingCommaInArray(){
+    fun missingCommaInArray() {
         val m = "Unexpected JSON token at offset 3: Expected end of the array or comma at path: \$[0]"
         val json = """[1 2 3 4]"""
 
         assertFailsWithSerialMessage("JsonDecodingException", m) {
             default.decodeFromString<List<Int>>(json)
         }
     }
+
+    @Test
+    fun missingCommaInStringMap() {
+        val m = "Unexpected JSON token at offset 9: Expected comma after the key-value pair at path: \$['a']"
+        val json = """{"a":"1" "b":"2"}"""
+
+        assertFailsWithSerialMessage("JsonDecodingException", m) {
+            default.decodeFromString<Map<String, String>>(json)
+        }
+    }
 }

formats/json/commonMain/src/kotlinx/serialization/json/internal/StreamingJsonDecoder.kt

@@ -45,7 +45,8 @@ internal open class StreamingJsonDecoder(
     private var discriminatorHolder: DiscriminatorHolder? = discriminatorHolder
     private val configuration = json.configuration
 
-    private val elementMarker: JsonElementMarker? = if (configuration.explicitNulls) null else JsonElementMarker(descriptor)
+    private val elementMarker: JsonElementMarker? =
+        if (configuration.explicitNulls) null else JsonElementMarker(descriptor)
 
     override fun decodeJsonElement(): JsonElement = JsonTreeReader(json.configuration, lexer).read()
 
@@ -76,14 +77,14 @@ internal open class StreamingJsonDecoder(
 
             @Suppress("UNCHECKED_CAST")
             val actualSerializer = try {
-                    deserializer.findPolymorphicSerializer(this, type)
-                } catch (it: SerializationException) { // Wrap SerializationException into JsonDecodingException to preserve position, path, and input.
-                    // Split multiline message from private core function:
-                    // core/commonMain/src/kotlinx/serialization/internal/AbstractPolymorphicSerializer.kt:102
-                    val message = it.message!!.substringBefore('\n').removeSuffix(".")
-                    val hint = it.message!!.substringAfter('\n', missingDelimiterValue = "")
-                    lexer.fail(message, hint = hint)
-                } as DeserializationStrategy<T>
+                deserializer.findPolymorphicSerializer(this, type) as DeserializationStrategy<T>
+            } catch (it: SerializationException) { // Wrap SerializationException into JsonDecodingException to preserve position, path, and input.
+                // Split multiline message from private core function:
+                // core/commonMain/src/kotlinx/serialization/internal/AbstractPolymorphicSerializer.kt:102
+                val message = it.message!!.substringBefore('\n').removeSuffix(".")
+                val hint = it.message!!.substringAfter('\n', missingDelimiterValue = "")
+                lexer.fail(message, hint = hint)
+            }
 
             discriminatorHolder = DiscriminatorHolder(discriminator)
             return actualSerializer.deserialize(this)