feat(flow): add whole-utterance batch ASR fallback (P1)

- Accumulate utterance PCM in FlowContinuousCapture for batch retry - Run full-utterance transcribeChunk when stitched final lags partial - Refactor Mac MLX tail drain to shared FlowUtteranceEndCoordinator - Add FlowUtterancePCMStore, UtteranceBatchFallbackPolicy, and tests Co-authored-by: Rocky <hkgood@users.noreply.github.com>
2026-07-26 10:15:31 +00:00
parent c7ee891a90
commit f0240c3088
9 changed files with 256 additions and 3 deletions
@@ -0,0 +1,45 @@
+// UtteranceBatchFallbackPolicyTests.swift
+// OSGKeyboardTests
+
+import XCTest
+@testable import OSGKeyboardShared
+
+final class UtteranceBatchFallbackPolicyTests: XCTestCase {
+
+    func testShouldRunWhenPartialClearlyLonger() {
+        XCTAssertTrue(
+            UtteranceBatchFallbackPolicy.shouldRunBatchFallback(
+                stitchedFinal: "今天很好",
+                partialSnapshot: "今天很好，我们一起去公园吧"
+            )
+        )
+    }
+
+    func testShouldRunWhenFinalEmptyButPartialPresent() {
+        XCTAssertTrue(
+            UtteranceBatchFallbackPolicy.shouldRunBatchFallback(
+                stitchedFinal: "",
+                partialSnapshot: "最后一段"
+            )
+        )
+    }
+
+    func testShouldNotRunWhenPartialNotLonger() {
+        XCTAssertFalse(
+            UtteranceBatchFallbackPolicy.shouldRunBatchFallback(
+                stitchedFinal: "今天很好，我们一起去公园吧",
+                partialSnapshot: "今天很好"
+            )
+        )
+    }
+
+    func testPreferredTranscriptPicksLongestCandidate() {
+        let resolved = UtteranceBatchFallbackPolicy.preferredTranscript(
+            batch: "今天很好，我们一起去公园吧",
+            stitchedFinal: "今天很好",
+            partialSnapshot: "今天很好，我们",
+            current: "今天很好，我们"
+        )
+        XCTAssertEqual(resolved, "今天很好，我们一起去公园吧")
+    }
+}