Simpler test

autotest/gcore/vsifile.py

@@ -1306,24 +1306,13 @@ def test_vsifile_win32_network_path():
 def test_vsifile_eof_cache_read(tmp_path):
     """Test issue GH #9658"""
 
-    np = pytest.importorskip("numpy")
-    # Create an empty GTiff file
-    filename = f"/vsizip/{tmp_path}/test.zip/testraster.tif"
-    driver = gdal.GetDriverByName("GTiff")
-    size = 1000
-    ds = driver.Create(
-        filename, size, size, 1, gdal.GDT_Byte, options=["STREAMABLE_OUTPUT=YES"]
-    )
-    assert ds
-    data = np.random.randint(0, 255, size=(size, size))
-    band = ds.GetRasterBand(1)
-    assert band.WriteArray(data) == 0
-    ds = None
-
-    # Read past EOF
+    tmp_filename = str(tmp_path / "vsifile_eof_cache_read.bin")
+    f = gdal.VSIFOpenL(tmp_filename, "wb")
+    gdal.VSIFWriteL(b"x" * 100000, 100000, 1, f)
+    gdal.VSIFCloseL(f)
     with gdal.config_option("VSI_CACHE", "YES"):
-        ds = gdal.Open(filename)
-        assert ds
-        b = ds.GetRasterBand(1)
-        # Read all
-        b.ReadRaster(0, 0, size, size)
+        f = gdal.VSIFOpenL(tmp_filename, "rb")
+        gdal.VSIFSeekL(f, 60000, 0)
+        data = gdal.VSIFReadL(1, 75000, f)  # reads past end of file
+        gdal.VSIFCloseL(f)
+        assert data == b"x" * 40000