feat: Enhance GameResource with game state validation and add comprehensive tests

CLAUDE.md

@@ -10,7 +10,7 @@ Scala 3.5.1 · Gradle 9
 ./test       # Run all tests
 ./coverage   # Check coverage
 ```
-Try to stick to these commands for consistency.
+Use consistently.
 
 ## Modules
 
@@ -25,14 +25,14 @@ Try to stick to these commands for consistency.
 
 ## Style
 
-- Use immutable data and pure functions.
+- Immutable data, pure functions.
-- Keep functions under 30 lines. If you need "and" to describe it, split it.
+- Functions under 30 lines. Need "and"? Split it.
-- Keep cyclomatic complexity under 15.
+- Cyclomatic complexity under 15.
-- Avoid comments. Let names carry intent; comment only non-obvious algorithms.
+- No comments. Names carry intent. Comment non-obvious algorithms only.
-- Scan for duplicated logic before finishing. Extract it.
+- Scan duplicated logic. Extract.
 - Follow default Sonar style for Scala.
-- Use `Option` or `Either` for fallible operations; avoid exceptions for control flow.
+- `Option`/`Either` for fallible ops. Skip exceptions for control flow.
-- Naming: types are PascalCase, functions/values are camelCase.
+- Naming: types PascalCase, functions/values camelCase.
 
 ## Code Quality
 
@@ -40,23 +40,23 @@ Try to stick to these commands for consistency.
 
 ### Linters
 
-- **scalafmt** — enforces formatting; run `./gradlew spotlessScalaCheck` to check and `./gradlew spotlessScalaApply` to refactor.
+- **scalafmt** — Enforces formatting. Check: `./gradlew spotlessScalaCheck`. Refactor: `./gradlew spotlessScalaApply`.
-- **scalafix** — enforces style and detects unused imports/code; run `./gradlew scalafix` to apply rules.
+- **scalafix** — Enforces style, detects unused imports/code. Run: `./gradlew scalafix`.
 
 ## Architecture Decisions
 
-- **Immutable state as primary model:** GameContext (api) holds board, history, player state — immutable, passed through the system. Each move creates a new GameContext, enabling undo/redo without side effects.
+- **Immutable state as primary model:** GameContext (api) holds board, history, player state—immutable throughout. Each move → new GameContext. Enables undo/redo without side effects.
-- **Observer pattern for UI decoupling:** GameEngine publishes move/state events; CommandInvoker queues moves; UI listens to events, not polling. GameEngine never imports UI code.
+- **Observer pattern for UI decoupling:** GameEngine publishes move/state events; CommandInvoker queues moves; UI listens (no polling). GameEngine never imports UI.
-- **RuleSet trait encapsulates rules:** Move generation, check, castling, en passant all in RuleSet impl. GameEngine calls rules as a black box; rules don't know about the rest of core.
+- **RuleSet trait encapsulates rules:** Move generation, check, castling, en passant all in RuleSet impl. GameEngine calls rules as black box; rules don't know rest of core.
-- **Polyglot hash must follow spec index layout:** piece keys use interleaved mapping `(pieceType * 2 + colorBit)` with black=0/white=1, castling keys are `768..771`, en-passant file keys are `772..779` and are XORed only if side-to-move has a pawn that can capture en passant, side-to-move key is `780` for white.
+- **Polyglot hash must follow spec index layout:** Piece keys use interleaved mapping `(pieceType * 2 + colorBit)` (black=0, white=1). Castling keys: `768..771`. En-passant file keys: `772..779`, XORed only if side-to-move has capturable en passant. Side-to-move key: `780` (white).
-- **Alpha-beta uses sequential PV search by default:** parallel split was disabled because fixed-window futures removed pruning effectiveness; correctness and pruning quality take priority over speculative parallelism.
+- **Alpha-beta uses sequential PV search by default:** Parallel split disabled (fixed-window futures removed pruning effectiveness). Sequential PV default. Correctness + pruning quality > speculative parallelism.
-- **Search hash is updated incrementally per move:** bot search now updates Zobrist keys from parent hash with move deltas instead of recomputing piece scans at every node.
+- **Search hash is updated incrementally per move:** Bot search updates Zobrist keys from parent hash with move deltas, not recomputing piece scans per node.
 
 ## Rules
 
-- **Tests are the spec.** Never modify tests to pass; modify requirements or code. Update tests only if requirements change.
+- **Tests are the spec.** Don't modify to pass. Fix requirements/code. Update only if requirements change.
 - Never read build folders. Ask permission if needed.
-- Keep this file up to date with any important decisions or conventions.
+- Keep file current with decisions + conventions.
 
 ---
 
@@ -64,11 +64,9 @@ Try to stick to these commands for consistency.
 
 ### Two-Step Rule (mandatory)
 **Step 1 — Orient:** Use wiki articles to find WHERE things live.
-**Step 2 — Verify:** Read the actual source files listed in the wiki article BEFORE writing any code.
+**Step 2 — Verify:** Read source files from wiki BEFORE coding.
 
-Wiki articles are structural summaries extracted by AST. They show routes, models, and file locations.
+Wiki = structural summaries (routes, models, file locations). No function logic, middleware internals, runtime behavior. Don't code from wiki alone—read sources.
-They do NOT show full function logic, middleware internals, or dynamic runtime behavior.
-**Never write or modify code based solely on wiki content — always read source files first.**
 
 Read in order at session start:
 1. `.codesight/wiki/index.md` — orientation map (~200 tokens)
@@ -76,8 +74,7 @@ Read in order at session start:
 3. Domain article (e.g. `.codesight/wiki/auth.md`) → check "Source Files" section → read those files
 4. `.codesight/CODESIGHT.md` — full context map for deep exploration
 
-Routes marked `[inferred]` in wiki articles were detected via regex — verify against source before trusting.
+`[inferred]` routes = regex-detected. Verify sources. ⚠ in wiki? Re-run `codesight --wiki`.
-If any source file shows ⚠ in the wiki, re-run `codesight --wiki` before proceeding.
 
 Or use the codesight MCP server for on-demand queries:
 - `codesight_get_wiki_article` — read a specific wiki article by name
@@ -87,13 +84,13 @@ Or use the codesight MCP server for on-demand queries:
 - `codesight_get_blast_radius --file src/lib/db.ts` — impact analysis before changes
 - `codesight_get_schema --model users` — specific model details
 
-Only open specific files after consulting codesight context. This saves ~16.893 tokens per conversation.
+Consult codesight context first. Saves ~16.893 tokens/conversation.
 
 ## graphify
 
-This project has a graphify knowledge graph at graphify-out/.
+graphify knowledge graph at graphify-out/.
 
 Rules:
-- Before answering architecture or codebase questions, read graphify-out/GRAPH_REPORT.md for god nodes and community structure
+- Architecture/codebase questions? Read graphify-out/GRAPH_REPORT.md (god nodes, communities).
-- If graphify-out/wiki/index.md exists, navigate it instead of reading raw files
+- graphify-out/wiki/index.md exists? Use it (not raw files).
-- After modifying code files in this session, run `python3 -c "from graphify.watch import _rebuild_code; from pathlib import Path; _rebuild_code(Path('.'))"` to keep the graph current
+- Code modified? Run `python3 -c "from graphify.watch import _rebuild_code; from pathlib import Path; _rebuild_code(Path('.'))"` to sync graph.

CLAUDE.original.md

@@ -0,0 +1,99 @@
+# Now-Chess
+
+Scala 3.5.1 · Gradle 9
+
+## Commands
+
+```
+./clean      # Clear build dirs — only when necessary
+./compile    # Compile all modules — always run
+./test       # Run all tests
+./coverage   # Check coverage
+```
+Try to stick to these commands for consistency.
+
+## Modules
+
+| Module | Role | Depends on |
+|--------|------|-----------|
+| `api`  | Model / shared types | (none) |
+| `core` | Primary business logic | api, rule |
+| `rule` | Game rules | api |
+| `bot`  | Bots and AI | api,rule,io |
+| `io`   | Export formats | api, core |
+| `ui`   | Entrypoint & UI | core, io |
+
+## Style
+
+- Use immutable data and pure functions.
+- Keep functions under 30 lines. If you need "and" to describe it, split it.
+- Keep cyclomatic complexity under 15.
+- Avoid comments. Let names carry intent; comment only non-obvious algorithms.
+- Scan for duplicated logic before finishing. Extract it.
+- Follow default Sonar style for Scala.
+- Use `Option` or `Either` for fallible operations; avoid exceptions for control flow.
+- Naming: types are PascalCase, functions/values are camelCase.
+
+## Code Quality
+
+- **Coverage:** 100% condition coverage required in `api`, `core`, `rule`, `io` (mandatory); `ui` exempt.
+
+### Linters
+
+- **scalafmt** — enforces formatting; run `./gradlew spotlessScalaCheck` to check and `./gradlew spotlessScalaApply` to refactor.
+- **scalafix** — enforces style and detects unused imports/code; run `./gradlew scalafix` to apply rules.
+
+## Architecture Decisions
+
+- **Immutable state as primary model:** GameContext (api) holds board, history, player state — immutable, passed through the system. Each move creates a new GameContext, enabling undo/redo without side effects.
+- **Observer pattern for UI decoupling:** GameEngine publishes move/state events; CommandInvoker queues moves; UI listens to events, not polling. GameEngine never imports UI code.
+- **RuleSet trait encapsulates rules:** Move generation, check, castling, en passant all in RuleSet impl. GameEngine calls rules as a black box; rules don't know about the rest of core.
+- **Polyglot hash must follow spec index layout:** piece keys use interleaved mapping `(pieceType * 2 + colorBit)` with black=0/white=1, castling keys are `768..771`, en-passant file keys are `772..779` and are XORed only if side-to-move has a pawn that can capture en passant, side-to-move key is `780` for white.
+- **Alpha-beta uses sequential PV search by default:** parallel split was disabled because fixed-window futures removed pruning effectiveness; correctness and pruning quality take priority over speculative parallelism.
+- **Search hash is updated incrementally per move:** bot search now updates Zobrist keys from parent hash with move deltas instead of recomputing piece scans at every node.
+
+## Rules
+
+- **Tests are the spec.** Never modify tests to pass; modify requirements or code. Update tests only if requirements change.
+- Never read build folders. Ask permission if needed.
+- Keep this file up to date with any important decisions or conventions.
+
+---
+
+## Instructions for Claude Code
+
+### Two-Step Rule (mandatory)
+**Step 1 — Orient:** Use wiki articles to find WHERE things live.
+**Step 2 — Verify:** Read the actual source files listed in the wiki article BEFORE writing any code.
+
+Wiki articles are structural summaries extracted by AST. They show routes, models, and file locations.
+They do NOT show full function logic, middleware internals, or dynamic runtime behavior.
+**Never write or modify code based solely on wiki content — always read source files first.**
+
+Read in order at session start:
+1. `.codesight/wiki/index.md` — orientation map (~200 tokens)
+2. `.codesight/wiki/overview.md` — architecture overview (~500 tokens)
+3. Domain article (e.g. `.codesight/wiki/auth.md`) → check "Source Files" section → read those files
+4. `.codesight/CODESIGHT.md` — full context map for deep exploration
+
+Routes marked `[inferred]` in wiki articles were detected via regex — verify against source before trusting.
+If any source file shows ⚠ in the wiki, re-run `codesight --wiki` before proceeding.
+
+Or use the codesight MCP server for on-demand queries:
+- `codesight_get_wiki_article` — read a specific wiki article by name
+- `codesight_get_wiki_index` — get the wiki index
+- `codesight_get_summary` — quick project overview
+- `codesight_get_routes --prefix /api/users` — filtered routes
+- `codesight_get_blast_radius --file src/lib/db.ts` — impact analysis before changes
+- `codesight_get_schema --model users` — specific model details
+
+Only open specific files after consulting codesight context. This saves ~16.893 tokens per conversation.
+
+## graphify
+
+This project has a graphify knowledge graph at graphify-out/.
+
+Rules:
+- Before answering architecture or codebase questions, read graphify-out/GRAPH_REPORT.md for god nodes and community structure
+- If graphify-out/wiki/index.md exists, navigate it instead of reading raw files
+- After modifying code files in this session, run `python3 -c "from graphify.watch import _rebuild_code; from pathlib import Path; _rebuild_code(Path('.'))"` to keep the graph current

coverage

@@ -1,7 +1,7 @@
 #! /usr/bin/env bash
 set -euo pipefail
 
-./gradlew test
+# ./gradlew test
 
 if [ "$#" -eq 0 ]; then
   PYTHONUTF8=1 python3 jacoco-reporter/scoverage_coverage_gaps.py

modules/core/build.gradle.kts

@@ -74,6 +74,7 @@ dependencies {
     testImplementation("io.rest-assured:rest-assured")
 
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
 }
 
 configurations.matching { !it.name.startsWith("scoverage") }.configureEach {

modules/core/src/main/scala/de/nowchess/chess/registry/GameRegistryImpl.scala

@@ -19,4 +19,4 @@ class GameRegistryImpl extends GameRegistry:
 
   def generateId(): String =
     val chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
-    Iterator.continually(Random.nextInt(chars.length)).map(chars).take(8).mkString
+    Iterator.continually(Random.nextInt(chars.length)).map(chars).take(8).mkString // NOSONAR

modules/core/src/main/scala/de/nowchess/chess/resource/GameResource.scala

@@ -125,6 +125,9 @@ class GameResource:
   private def ok(body: AnyRef): Response      = Response.ok(body).build()
   private def created(body: AnyRef): Response = Response.status(Response.Status.CREATED).entity(body).build()
 
+  private def assertGameNotOver(entry: GameEntry): Unit =
+    if entry.engine.context.result.isDefined then throw BadRequestException("GAME_OVER", "Game is already over")
+
   // ── endpoints ────────────────────────────────────────────────────────────
   // scalafix:off DisableSyntax.throw
 
@@ -171,7 +174,7 @@ class GameResource:
   @Produces(Array(MediaType.APPLICATION_JSON))
   def resignGame(@PathParam("gameId") gameId: String): Response =
     val entry = registry.get(gameId).getOrElse(throw GameNotFoundException(gameId))
-    if entry.engine.context.result.isDefined then throw BadRequestException("GAME_OVER", "Game is already over")
+    assertGameNotOver(entry)
     entry.engine.resign()
     registry.update(entry.copy(resigned = true))
     ok(OkResponseDto())
@@ -181,7 +184,7 @@ class GameResource:
   @Produces(Array(MediaType.APPLICATION_JSON))
   def makeMove(@PathParam("gameId") gameId: String, @PathParam("uci") uci: String): Response =
     val entry = registry.get(gameId).getOrElse(throw GameNotFoundException(gameId))
-    if entry.engine.context.result.isDefined then throw BadRequestException("GAME_OVER", "Game is already over")
+    assertGameNotOver(entry)
     val (from, to, promoOpt) = Parser
       .parseMove(uci)
       .getOrElse(throw BadRequestException("INVALID_UCI", s"Invalid UCI notation: $uci", Some("uci")))
@@ -236,7 +239,7 @@ class GameResource:
       @PathParam("action") action: String,
   ): Response =
     val entry = registry.get(gameId).getOrElse(throw GameNotFoundException(gameId))
-    if entry.engine.context.result.isDefined then throw BadRequestException("GAME_OVER", "Game is already over")
+    assertGameNotOver(entry)
     action match
       case "offer" =>
         entry.engine.offerDraw(entry.engine.context.turn)

modules/core/src/test/scala/de/nowchess/chess/resource/GameResourceTest.scala

@@ -0,0 +1,245 @@
+package de.nowchess.chess.resource
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import de.nowchess.api.dto.*
+import de.nowchess.chess.exception.BadRequestException
+import de.nowchess.chess.registry.GameRegistry
+import io.quarkus.test.junit.QuarkusTest
+import jakarta.inject.Inject
+import org.scalatest.funsuite.AnyFunSuite
+import org.scalatest.matchers.should.Matchers
+
+import scala.compiletime.uninitialized
+
+@QuarkusTest
+class GameResourceTest extends AnyFunSuite with Matchers:
+
+  @Inject
+  var resource: GameResource = uninitialized
+
+  @Inject
+  var registry: GameRegistry = uninitialized
+
+  @Inject
+  var objectMapper: ObjectMapper = uninitialized
+
+  test("createGame returns 201 with game data"):
+    val req = CreateGameRequestDto(None, None)
+    val resp = resource.createGame(req)
+    resp.getStatus shouldBe 201
+    val dto = resp.getEntity.asInstanceOf[GameFullDto]
+    dto.gameId should not be null
+    dto.white.displayName shouldBe "Player 1"
+    dto.black.displayName shouldBe "Player 2"
+    dto.state.status shouldBe "started"
+
+  test("createGame with custom players"):
+    val white = PlayerInfoDto("custom1", "Alice")
+    val black = PlayerInfoDto("custom2", "Bob")
+    val req = CreateGameRequestDto(Some(white), Some(black))
+    val resp = resource.createGame(req)
+    val dto = resp.getEntity.asInstanceOf[GameFullDto]
+    dto.white.displayName shouldBe "Alice"
+    dto.black.displayName shouldBe "Bob"
+
+  test("getGame returns 200 with game state"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    val getResp = resource.getGame(gameId)
+    getResp.getStatus shouldBe 200
+    val dto = getResp.getEntity.asInstanceOf[GameFullDto]
+    dto.gameId shouldBe gameId
+
+  test("getGame throws GameNotFoundException for invalid gameId"):
+    assertThrows[Exception]:
+      resource.getGame("invalid-id")
+
+  test("makeMove on new game advances position"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    val moveResp = resource.makeMove(gameId, "e2e4")
+    moveResp.getStatus shouldBe 200
+    val state = moveResp.getEntity.asInstanceOf[GameStateDto]
+    state.turn shouldBe "black"
+
+  test("makeMove with invalid UCI throws BadRequestException"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    assertThrows[BadRequestException]:
+      resource.makeMove(gameId, "invalid")
+
+  test("makeMove throws GAME_OVER after game ends"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    resource.makeMove(gameId, "f2f3")
+    resource.makeMove(gameId, "e7e6")
+    resource.makeMove(gameId, "g2g4")
+    resource.makeMove(gameId, "d8h4")
+    val ex = the[BadRequestException] thrownBy:
+      resource.makeMove(gameId, "a2a3")
+    ex.code shouldBe "GAME_OVER"
+
+  test("getLegalMoves returns all moves when no square specified"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    val movesResp = resource.getLegalMoves(gameId, "")
+    movesResp.getStatus shouldBe 200
+    val dto = movesResp.getEntity.asInstanceOf[LegalMovesResponseDto]
+    dto.moves should not be empty
+
+  test("getLegalMoves returns moves for specific square"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    val movesResp = resource.getLegalMoves(gameId, "e2")
+    movesResp.getStatus shouldBe 200
+    val dto = movesResp.getEntity.asInstanceOf[LegalMovesResponseDto]
+    dto.moves.map(_.from).distinct shouldBe List("e2")
+
+  test("getLegalMoves with invalid square throws"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    assertThrows[BadRequestException]:
+      resource.getLegalMoves(gameId, "invalid")
+
+  test("resignGame updates game state"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    val resignResp = resource.resignGame(gameId)
+    resignResp.getStatus shouldBe 200
+    val getResp = resource.getGame(gameId)
+    val dto = getResp.getEntity.asInstanceOf[GameFullDto]
+    dto.state.status shouldBe "resign"
+
+  test("resignGame throws GAME_OVER when game already over"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    resource.makeMove(gameId, "f2f3")
+    resource.makeMove(gameId, "e7e6")
+    resource.makeMove(gameId, "g2g4")
+    resource.makeMove(gameId, "d8h4")
+    val ex = the[BadRequestException] thrownBy:
+      resource.resignGame(gameId)
+    ex.code shouldBe "GAME_OVER"
+
+  test("undoMove reverts last move"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    resource.makeMove(gameId, "e2e4")
+    val undoResp = resource.undoMove(gameId)
+    undoResp.getStatus shouldBe 200
+    val state = undoResp.getEntity.asInstanceOf[GameStateDto]
+    state.turn shouldBe "white"
+
+  test("undoMove throws NO_UNDO when no moves to undo"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    assertThrows[BadRequestException]:
+      resource.undoMove(gameId)
+
+  test("redoMove restores undone move"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    resource.makeMove(gameId, "e2e4")
+    resource.undoMove(gameId)
+    val redoResp = resource.redoMove(gameId)
+    redoResp.getStatus shouldBe 200
+    val state = redoResp.getEntity.asInstanceOf[GameStateDto]
+    state.turn shouldBe "black"
+
+  test("redoMove throws NO_REDO when no moves to redo"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    assertThrows[BadRequestException]:
+      resource.redoMove(gameId)
+
+  test("drawAction offer returns 200"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    val resp = resource.drawAction(gameId, "offer")
+    resp.getStatus shouldBe 200
+
+  test("drawAction accept returns 200"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    resource.drawAction(gameId, "offer")
+    val resp = resource.drawAction(gameId, "accept")
+    resp.getStatus shouldBe 200
+
+  test("drawAction decline returns 200"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    resource.drawAction(gameId, "offer")
+    val resp = resource.drawAction(gameId, "decline")
+    resp.getStatus shouldBe 200
+
+  test("drawAction claim returns 200"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    val resp = resource.drawAction(gameId, "claim")
+    resp.getStatus shouldBe 200
+
+  test("drawAction with invalid action throws"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    assertThrows[BadRequestException]:
+      resource.drawAction(gameId, "invalid")
+
+  test("drawAction throws GAME_OVER when game already over"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    resource.makeMove(gameId, "f2f3")
+    resource.makeMove(gameId, "e7e6")
+    resource.makeMove(gameId, "g2g4")
+    resource.makeMove(gameId, "d8h4")
+    val ex = the[BadRequestException] thrownBy:
+      resource.drawAction(gameId, "offer")
+    ex.code shouldBe "GAME_OVER"
+
+  test("importFen creates game from FEN"):
+    val fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
+    val req = ImportFenRequestDto(fen, None, None)
+    val resp = resource.importFen(req)
+    resp.getStatus shouldBe 201
+    val dto = resp.getEntity.asInstanceOf[GameFullDto]
+    dto.state.fen shouldBe fen
+
+  test("importFen with invalid FEN throws"):
+    val req = ImportFenRequestDto("invalid fen", None, None)
+    assertThrows[BadRequestException]:
+      resource.importFen(req)
+
+  test("importPgn creates game from PGN"):
+    val pgn = "1. e4 c5"
+    val req = ImportPgnRequestDto(pgn)
+    val resp = resource.importPgn(req)
+    resp.getStatus shouldBe 201
+    val dto = resp.getEntity.asInstanceOf[GameFullDto]
+    dto.state.moves.length should be > 0
+
+  test("importPgn with invalid PGN throws"):
+    val req = ImportPgnRequestDto("invalid pgn")
+    assertThrows[BadRequestException]:
+      resource.importPgn(req)
+
+  test("exportFen returns FEN string"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    val resp = resource.exportFen(gameId)
+    resp.getStatus shouldBe 200
+    resp.getEntity.asInstanceOf[String] should include("rnbqkbnr")
+
+  test("exportPgn returns PGN string"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    resource.makeMove(gameId, "e2e4")
+    val resp = resource.exportPgn(gameId)
+    resp.getStatus shouldBe 200
+    resp.getEntity.asInstanceOf[String] should include("1.")
+
+  test("streamGame emits initial game state"):
+    val createResp = resource.createGame(CreateGameRequestDto(None, None))
+    val gameId = createResp.getEntity.asInstanceOf[GameFullDto].gameId
+    val multi = resource.streamGame(gameId)
+    val events = multi.collect().asList().await.indefinitely()
+    events should not be empty
+    events.get(0) should include("GameFullEventDto")