TextLLMRunner test. (#12731)

Summary: .

Reviewed By: mergennachin

Differential Revision: D77436559

Author: shoumikhin

extension/llm/apple/ExecuTorchLLM/__tests__/TextLLMRunnerTest.swift

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import ExecuTorchLLM
+import XCTest
+
+struct SpecialTokens {
+  static let kSpecialTokensSize = 256
+
+  static func defaultSpecialTokens() -> [String] {
+    var tokens = [
+      "<|begin_of_text|>",
+      "<|end_of_text|>",
+      "<|reserved_special_token_0|>",
+      "<|reserved_special_token_1|>",
+      "<|finetune_right_pad_id|>",
+      "<|step_id|>",
+      "<|start_header_id|>",
+      "<|end_header_id|>",
+      "<|eom_id|>",
+      "<|eot_id|>",
+      "<|python_tag|>"
+    ]
+    var reservedIndex = 2
+    while tokens.count < kSpecialTokensSize {
+      tokens.append("<|reserved_special_token_\(reservedIndex)|>")
+      reservedIndex += 1
+    }
+    return tokens
+  }
+}
+
+class TextLLMRunnerTest: XCTestCase {
+  func test() {
+    let bundle = Bundle(for: type(of: self))
+    guard let modelPath = bundle.path(forResource: "llama3_2-1B", ofType: "pte"),
+          let tokenizerPath = bundle.path(forResource: "tokenizer", ofType: "model") else {
+      XCTFail("Couldn't find model or tokenizer files")
+      return
+    }
+    let runner = TextLLMRunner(modelPath: modelPath, tokenizerPath: tokenizerPath, specialTokens: SpecialTokens.defaultSpecialTokens())
+    var text = ""
+
+    do {
+      try runner.generate("hello", sequenceLength: 2) { token in
+        text += token
+      }
+    } catch {
+      XCTFail("Failed to generate text with error \(error)")
+    }
+    XCTAssertEqual("hello,", text.lowercased())
+  }
+}