test: add create endpoint contract coverage for api client

AGENTS.md

@@ -24,6 +24,7 @@ Kanbn4Droid is an unofficial app to connect to and manipulate data stored in sel
 - Baseline tests:
   - JVM unit tests for auth URL normalization and auth error mapping in `app/src/test/`.
   - JVM unit tests for boards repository and boards view model in `app/src/test/space/hackenslacker/kanbn4droid/app/boards/`.
+  - JVM API-client contract tests for board-detail parsing and create list/card endpoint payloads and id parsing in `app/src/test/java/space/hackenslacker/kanbn4droid/app/auth/HttpKanbnApiClientBoardDetailParsingTest.kt`.
   - Instrumentation tests for login and boards flows in `app/src/androidTest/`.
 
 ## Command-line workflow

app/src/main/java/space/hackenslacker/kanbn4droid/app/auth/KanbnApiClient.kt

@@ -778,7 +778,11 @@ class HttpKanbnApiClient : KanbnApiClient {
                     ?: data
             }
 
-            else -> root
+            else -> {
+                (root["card"] as? Map<*, *>)
+                    ?: (root["list"] as? Map<*, *>)
+                    ?: root
+            }
         }
 
         val publicId = extractString(entity, "publicId", "public_id", "id")

app/src/test/java/space/hackenslacker/kanbn4droid/app/auth/HttpKanbnApiClientBoardDetailParsingTest.kt

@@ -18,12 +18,41 @@ import org.junit.Assert.assertNull
 import org.junit.Assert.assertTrue
 import org.junit.Test
 import space.hackenslacker.kanbn4droid.app.boarddetail.BoardDetail
+import space.hackenslacker.kanbn4droid.app.boarddetail.CreatedEntityRef
 import space.hackenslacker.kanbn4droid.app.boards.BoardsApiResult
 
 class HttpKanbnApiClientBoardDetailParsingTest {
 
     @Test
-    fun createCardFormatsLocalDateAsUtcMidnightInPayload() = runTest {
+    fun createList_sendsAppendIndexPayload_andParsesPublicIdFallbacks() = runTest {
+        TestServer().use { server ->
+            server.register(
+                path = "/api/v1/lists",
+                method = "POST",
+                status = 200,
+                responseBody = """{"list":{"public_id":"list-new"}}""",
+            )
+
+            val result = HttpKanbnApiClient().createList(
+                baseUrl = server.baseUrl,
+                apiKey = "api",
+                boardPublicId = "board-1",
+                title = "Sprint",
+                appendIndex = 7,
+            )
+
+            assertTrue(result is BoardsApiResult.Success<*>)
+            val createdRef = (result as BoardsApiResult.Success<*>).value as CreatedEntityRef
+            assertEquals("list-new", createdRef.publicId)
+
+            val request = server.findRequest("POST", "/api/v1/lists")
+            assertNotNull(request)
+            assertEquals("{\"boardPublicId\":\"board-1\",\"name\":\"Sprint\",\"index\":7}", request?.body)
+        }
+    }
+
+    @Test
+    fun createCard_serializesLocalDateAsUtcMidnight() = runTest {
         TestServer().use { server ->
             server.register(path = "/api/v1/cards", method = "POST", status = 200, responseBody = """{"publicId":"card-new"}""")
 
@@ -46,7 +75,7 @@ class HttpKanbnApiClientBoardDetailParsingTest {
     }
 
     @Test
-    fun createCardOmitsNullDueDateAndDescriptionInPayload() = runTest {
+    fun createCard_sendsTopIndex_andOmittedDueDateWhenNull() = runTest {
         TestServer().use { server ->
             server.register(path = "/api/v1/cards", method = "POST", status = 200, responseBody = """{"publicId":"card-new"}""")
 
@@ -63,11 +92,38 @@ class HttpKanbnApiClientBoardDetailParsingTest {
             assertTrue(result is BoardsApiResult.Success<*>)
             val request = server.findRequest("POST", "/api/v1/cards")
             assertNotNull(request)
+            assertTrue(request?.body?.contains("\"index\":0") == true)
             assertTrue(request?.body?.contains("\"dueDate\"") == false)
             assertTrue(request?.body?.contains("\"description\"") == false)
         }
     }
 
+    @Test
+    fun createCard_returnsCreatedRefWithNullPublicIdWhenResponseHasNoId() = runTest {
+        TestServer().use { server ->
+            server.register(
+                path = "/api/v1/cards",
+                method = "POST",
+                status = 200,
+                responseBody = """{"card":{"title":"Card without id"}}""",
+            )
+
+            val result = HttpKanbnApiClient().createCard(
+                baseUrl = server.baseUrl,
+                apiKey = "api",
+                listPublicId = "list-1",
+                title = "Card",
+                description = null,
+                dueDate = null,
+                tagPublicIds = emptyList(),
+            )
+
+            assertTrue(result is BoardsApiResult.Success<*>)
+            val createdRef = (result as BoardsApiResult.Success<*>).value as CreatedEntityRef
+            assertNull(createdRef.publicId)
+        }
+    }
+
     @Test
     fun getBoardDetailParsesWrappedPayloadWithDueDateVariants() = runTest {
         TestServer().use { server ->