Add test case for token-level transcription

Author: exPHAT

Tests/WhisperTests/Transcription Tests/TranscriptionParameterTests.swift

@@ -0,0 +1,23 @@
+import XCTest
+@testable import SwiftWhisper
+
+class TranscriptionParamterTests: ResourceDependentTestCase, ModelFileTestCase, AudioFileTestCase {
+    let timeout: TimeInterval = 60
+
+    @available(iOS 13, macOS 10.15, *)
+    func testParametersMaxLen() async throws {
+        let params = WhisperParams()
+        params.language = .english
+        params.max_len = 1
+        params.token_timestamps = true
+
+        let modelURL = await tinyModelURL!
+        let whisper = Whisper(fromFileURL: modelURL, withParams: params)
+        let jfk = jfkAudioFrames!
+
+        let segments = try await whisper.transcribe(audioFrames: jfk)
+
+        // The JFK audio contains 23 non-empty segments
+        XCTAssert(segments.filter { !$0.text.isEmpty }.count == 23)
+    }
+}