fix: bypass ai for singleton-backed viewmodels

modules/test-generator/src/main/kotlin/dev/diff2test/android/testgenerator/AiTestGenerator.kt

@@ -1073,15 +1073,19 @@ private fun <T> elapsedFailure(startedAt: Long, message: String, error: Exceptio
     throw IllegalStateException(message, error)
 }
 
+private val DIRECT_SINGLETON_ACCESS_PATTERN = Regex("""\b[A-Z][A-Za-z0-9_]*\.[a-z][A-Za-z0-9_]*""")
+
 private fun maybeBypassAi(
     plan: TestPlan,
     context: TestContext,
     analysis: ViewModelAnalysis,
     fallback: TestGenerator,
 ): GeneratedTestBundle? {
     val usesDirectSingleton = analysis.publicMethods.any { method ->
-        Regex("""\b[A-Z][A-Za-z0-9_]*\.[a-z][A-Za-z0-9_]*""").containsMatchIn(method.body.orEmpty())
-    }
+        DIRECT_SINGLETON_ACCESS_PATTERN.containsMatchIn(method.body.orEmpty())
+    } || runCatching {
+        Files.exists(analysis.filePath) && DIRECT_SINGLETON_ACCESS_PATTERN.containsMatchIn(Files.readString(analysis.filePath))
+    }.getOrDefault(false)
     if (context.styleGuide.coroutineEntryPoint == "runTest" || !usesDirectSingleton) {
         return null
     }

modules/test-generator/src/test/kotlin/dev/diff2test/android/testgenerator/OpenAiResponsesTestGeneratorTest.kt

@@ -589,6 +589,66 @@ class OpenAiResponsesTestGeneratorTest {
         assertContains(bundle.warnings.joinToString("\n"), "AI generation was skipped")
     }
 
+    @Test
+    fun `bypasses ai when changed methods miss singleton access but source file contains it`() {
+        val sourceFile = Files.createTempFile("nutrition-chat-viewmodel", ".kt")
+        Files.writeString(
+            sourceFile,
+            """
+                package net.ifmain.androiddummy.chatbot.ui
+
+                class NutritionChatViewModel {
+                    fun onInputChange(input: String) {}
+
+                    fun sendMessage() {
+                        ChatbotService.api.sendMessage(request)
+                    }
+                }
+            """.trimIndent(),
+        )
+
+        val analysis = ViewModelAnalysis(
+            className = "NutritionChatViewModel",
+            packageName = "net.ifmain.androiddummy.chatbot.ui",
+            filePath = sourceFile,
+            publicMethods = listOf(
+                dev.diff2test.android.core.TargetMethod(
+                    name = "onInputChange",
+                    signature = "fun onInputChange(input: String)",
+                    body = "_uiState.update { it }",
+                    mutatesState = true,
+                ),
+            ),
+        )
+        val generator = ChatCompletionsTestGenerator(
+            config = ChatCompletionsConfig(
+                apiKey = "sk-local",
+                model = "qwen3-coder-next-mlx",
+                baseUrl = "http://127.0.0.1:12345/v1",
+            ),
+            httpClient = fakeHttpClient(statusCode = 500, body = "should not be called"),
+        )
+
+        val bundle = generator.generate(
+            plan = TestPlan(
+                targetClass = "NutritionChatViewModel",
+                targetMethods = listOf("onInputChange"),
+                testType = TestType.LOCAL_UNIT,
+                scenarios = emptyList(),
+                requiredFakes = emptyList(),
+                assertions = emptyList(),
+                riskLevel = RiskLevel.LOW,
+            ),
+            context = TestContext(
+                moduleName = "app",
+                styleGuide = StyleGuide(assertionStyle = "junit4", coroutineEntryPoint = "unavailable"),
+            ),
+            analysis = analysis,
+        )
+
+        assertContains(bundle.warnings.joinToString("\n"), "AI generation was skipped")
+    }
+
     private fun findRepoRoot(): Path {
         var current: Path? = Path.of(System.getProperty("user.dir")).toAbsolutePath().normalize()