added modification to text method and test for it

generativeai/src/main/java/com/google/ai/client/generativeai/type/GenerateContentResponse.kt

@@ -32,7 +32,19 @@ class GenerateContentResponse(
 ) {
   /** Convenience field representing all the text parts in the response, if they exists. */
   val text: String? by lazy {
-    candidates.first().content.parts.filterIsInstance<TextPart>().joinToString(" ") { it.text }
+    candidates
+      .first()
+      .content
+      .parts
+      .filter { it is TextPart || it is ExecutableCodePart || it is CodeExecutionResultPart }
+      .joinToString(" ") {
+        when (it) {
+          is TextPart -> it.text
+          is ExecutableCodePart -> "\n```${it.language.lowercase()}\n${it.code}\n```"
+          is CodeExecutionResultPart -> "\n```\n${it.output}\n```"
+          else -> throw RuntimeException("unreachable")
+        }
+      }
   }
 
   /** Convenience field representing the first function call part in the request, if it exists */

generativeai/src/test/java/com/google/ai/client/generativeai/GenerateContentResponseTest.kt

@@ -17,6 +17,9 @@
 package com.google.ai.client.generativeai
 
 import com.google.ai.client.generativeai.type.Candidate
+import com.google.ai.client.generativeai.type.CodeExecutionResultPart
+import com.google.ai.client.generativeai.type.ExecutableCodePart
+import com.google.ai.client.generativeai.type.ExecutionOutcome
 import com.google.ai.client.generativeai.type.FunctionCallPart
 import com.google.ai.client.generativeai.type.GenerateContentResponse
 import com.google.ai.client.generativeai.type.content
@@ -74,6 +77,38 @@ internal class GenerateContentResponseTest {
     response.text shouldBe "This is a textPart"
   }
 
+  @Test
+  fun `generate response should add generated code to the response`() {
+    val response =
+      GenerateContentResponse(
+        candidates =
+          listOf(
+            Candidate(
+              content {
+                text("I can calculate that for you!")
+                part(ExecutableCodePart("python", "print(\"hello world\")"))
+                part(CodeExecutionResultPart(ExecutionOutcome.OK, "hello world"))
+              },
+              listOf(),
+              listOf(),
+              null,
+            )
+          ),
+        null,
+        null,
+      )
+
+    response.text shouldBe """
+        I can calculate that for you! 
+        ```python
+        print("hello world")
+        ``` 
+        ```
+        hello world
+        ```
+      """.trimIndent()
+  }
+
   @Test
   fun `generate response should get strings and concatenate them together`() {
     val response =