first implementation

tests/test_db.py

@@ -380,7 +380,7 @@ def _make_raw(job_id: str, company: str = "Acme") -> RawJob:
 class TestRunBatch:
     """Monkeypatched run_batch tests — no network, no real providers."""
 
-    def _patch_all(self, monkeypatch, raw_jobs: list[RawJob]) -> None:
+    def _patch_all(self, monkeypatch, raw_jobs: list[RawJob]) -> MagicMock:
         """Patch all external I/O in pipeline so tests run offline."""
         from jobsource.careers.cascade import CareersResult
 
@@ -418,6 +418,7 @@ class TestRunBatch:
         cm.__enter__ = lambda s: MagicMock()
         cm.__exit__ = MagicMock(return_value=False)
         monkeypatch.setattr("jobsource.pipeline.build_client", lambda: cm)
+        return fake_source
 
     def test_new_jobs_processed(self, tmp_path: Path, monkeypatch) -> None:
         from jobsource.pipeline import run_batch
@@ -469,6 +470,20 @@ class TestRunBatch:
         assert summary.new == 3
         assert summary.position_found == 3
 
+    def test_fetch_limit_matches_batch_size(self, tmp_path: Path, monkeypatch) -> None:
+        """Immediate re-runs only re-fetch the requested batch window."""
+        from jobsource.pipeline import run_batch
+
+        raw = [_make_raw(str(i), company=f"Co{i}") for i in range(10)]
+        source = self._patch_all(monkeypatch, raw)
+
+        db = Database(path=tmp_path / "fetch-limit.db")
+        summary = run_batch(batch_size=3, search_terms=["eng"], db=db)
+
+        assert summary.new == 3
+        source.fetch_recent_jobs.assert_called_once()
+        assert source.fetch_recent_jobs.call_args.kwargs["results_wanted"] == 3
+
     def test_resolve_failure_marks_needs_review(self, tmp_path: Path, monkeypatch) -> None:
         """Jobs where resolve_website returns None get needs_review, not failed."""
         from jobsource.pipeline import run_batch