FEAT: Support all Tier 1, 2 and 3 targets by Kotlin & remove dependency on Kotest Json due to not supporting all targets (#151)

Co-authored-by: Leonid Stashevsky <e5l@users.noreply.github.com>

src/commonTest/kotlin/AudioContentSerializationTest.kt

@@ -1,20 +1,20 @@
 package io.modelcontextprotocol.kotlin.sdk
 
-import io.kotest.assertions.json.shouldEqualJson
 import io.modelcontextprotocol.kotlin.sdk.shared.McpJson
-import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.decodeFromJsonElement
+import kotlinx.serialization.json.encodeToJsonElement
+import kotlinx.serialization.json.put
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
 class AudioContentSerializationTest {
 
-    private val audioContentJson = """
-        {
-          "data": "base64-encoded-audio-data",
-           "mimeType": "audio/wav",
-          "type": "audio"
-        }
-    """.trimIndent()
+    private val audioContentJson = buildJsonObject {
+        put("data", "base64-encoded-audio-data")
+        put("mimeType", "audio/wav")
+        put("type", "audio")
+    }
 
     private val audioContent = AudioContent(
         data = "base64-encoded-audio-data",
@@ -23,12 +23,17 @@ class AudioContentSerializationTest {
 
     @Test
     fun `should serialize audio content`() {
-        McpJson.encodeToString(audioContent) shouldEqualJson audioContentJson
+        val actual = McpJson.encodeToJsonElement(audioContent)
+        assertEquals(
+            audioContentJson,
+            actual,
+            "Expected $actual to be equal to $audioContentJson"
+        )
     }
 
     @Test
     fun `should deserialize audio content`() {
-        val content = McpJson.decodeFromString<AudioContent>(audioContentJson)
+        val content = McpJson.decodeFromJsonElement<AudioContent>(audioContentJson)
         assertEquals(expected = audioContent, actual = content)
     }
 }

src/commonTest/kotlin/io/modelcontextprotocol/kotlin/sdk/ToolSerializationTest.kt

@@ -1,51 +1,53 @@
 package io.modelcontextprotocol.kotlin.sdk
 
-import io.kotest.assertions.json.shouldEqualJson
 import io.modelcontextprotocol.kotlin.sdk.shared.McpJson
 import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonArray
 import kotlinx.serialization.json.JsonPrimitive
 import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.decodeFromJsonElement
+import kotlinx.serialization.json.encodeToJsonElement
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
 class ToolSerializationTest {
 
     // see https://docs.anthropic.com/en/docs/build-with-claude/tool-use
-    /* language=json */
-    private val getWeatherToolJson = """
-        {
-          "name": "get_weather",
-          "description": "Get the current weather in a given location",
-          "inputSchema": {
-            "type": "object",
-            "properties": {
-              "location": {
-                "type": "string",
-                "description": "The city and state, e.g. San Francisco, CA"
-              }
-            },
-            "required": ["location"]
-          },
-          "outputSchema": {
-            "type": "object",
-            "properties": {
-              "temperature": {
-                "type": "number",
-                "description": "Temperature in celsius"
-              },
-              "conditions": {
-                "type": "string",
-                "description": "Weather conditions description"
-              },
-              "humidity": {
-                "type": "number",
-                "description": "Humidity percentage"
-              }
-            },
-            "required": ["temperature", "conditions", "humidity"]
-          }
-        }
-    """.trimIndent()
+    private val getWeatherToolJson = buildJsonObject {
+        put("name", JsonPrimitive("get_weather"))
+        put("description", JsonPrimitive("Get the current weather in a given location"))
+        put("inputSchema", buildJsonObject {
+            put("properties", buildJsonObject {
+                put("location", buildJsonObject {
+                    put("type", JsonPrimitive("string"))
+                    put("description", JsonPrimitive("The city and state, e.g. San Francisco, CA"))
+                })
+            })
+            put("required", JsonArray(listOf(JsonPrimitive("location"))))
+            put("type", JsonPrimitive("object"))
+        })
+        put("outputSchema", buildJsonObject {
+            put("type", JsonPrimitive("object"))
+            put("properties", buildJsonObject {
+                put("temperature", buildJsonObject {
+                    put("type", JsonPrimitive("number"))
+                    put("description", JsonPrimitive("Temperature in celsius"))
+                })
+                put("conditions", buildJsonObject {
+                    put("type", JsonPrimitive("string"))
+                    put("description", JsonPrimitive("Weather conditions description"))
+                })
+                put("humidity", buildJsonObject {
+                    put("type", JsonPrimitive("number"))
+                    put("description", JsonPrimitive("Humidity percentage"))
+                })
+            })
+            put(
+                "required",
+                JsonArray(listOf(JsonPrimitive("temperature"), JsonPrimitive("conditions"), JsonPrimitive("humidity")))
+            )
+        })
+    }
 
     val getWeatherTool = Tool(
         name = "get_weather",
@@ -81,12 +83,18 @@ class ToolSerializationTest {
 
     @Test
     fun `should serialize get_weather tool`() {
-        McpJson.encodeToString(getWeatherTool) shouldEqualJson getWeatherToolJson
+        val actual = McpJson.encodeToJsonElement(getWeatherTool)
+
+        assertEquals(
+            getWeatherToolJson,
+            actual,
+            "Expected $actual to be equal to $getWeatherToolJson"
+        )
     }
 
     @Test
     fun `should deserialize get_weather tool`() {
-        val tool = McpJson.decodeFromString<Tool>(getWeatherToolJson)
+        val tool = McpJson.decodeFromJsonElement<Tool>(getWeatherToolJson)
         assertEquals(expected = getWeatherTool, actual = tool)
     }
 
@@ -95,6 +103,11 @@ class ToolSerializationTest {
         val json = Json(from = McpJson) {
             encodeDefaults = false
         }
-        json.encodeToString(getWeatherTool) shouldEqualJson getWeatherToolJson
+        val actual = json.encodeToJsonElement(getWeatherTool)
+        assertEquals(
+            getWeatherToolJson,
+            actual,
+            "Expected $actual to be equal to $getWeatherToolJson"
+        )
     }
 }

src/commonTest/kotlin/io/modelcontextprotocol/kotlin/sdk/shared/ReadBufferTest.kt

@@ -4,7 +4,6 @@ import io.ktor.utils.io.charsets.Charsets
 import io.ktor.utils.io.core.toByteArray
 import io.modelcontextprotocol.kotlin.sdk.JSONRPCMessage
 import io.modelcontextprotocol.kotlin.sdk.JSONRPCNotification
-import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import kotlin.test.Test
 import kotlin.test.assertEquals

src/nativeMain/kotlin/io/modelcontextprotocol/kotlin/sdk/internal/utils.native.kt

@@ -0,0 +1,8 @@
+package io.modelcontextprotocol.kotlin.sdk.internal
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.IO
+
+internal actual val IODispatcher: CoroutineDispatcher
+    get() = Dispatchers.IO