test(lesavka): cover client decoder policy flags

tests/compatibility/client/video_support/client_video_support_include_contract.rs

@@ -135,6 +135,57 @@ fn vulkan_decoder_fragment_downloads_gpu_memory_before_cpu_sinks() {
     let named = video_support::h264_decoder_launch_fragment_named("vulkanh264dec", "decoder1");
     assert!(named.contains("vulkanh264dec name=decoder1"));
     assert!(named.contains("vulkandownload"));
+
+    assert_eq!(
+        video_support::h264_decoder_launch_fragment_named("nvh264dec", "left_decoder"),
+        "nvh264dec name=left_decoder"
+    );
+}
+
+#[test]
+#[serial]
+fn video_fallback_flags_require_clear_opt_in_values() {
+    for disabled in [
+        None,
+        Some(""),
+        Some("0"),
+        Some("false"),
+        Some("no"),
+        Some("off"),
+    ] {
+        with_var("LESAVKA_ALLOW_SOFTWARE_VIDEO", disabled, || {
+            assert!(!video_support::software_video_fallback_allowed());
+        });
+        with_var("LESAVKA_ALLOW_VULKAN_H264_DECODER", disabled, || {
+            assert!(!video_support::h264_decoder_preference_order().contains(&"vulkanh264dec"));
+        });
+    }
+
+    for enabled in ["1", "true", "yes", "on", "lab"] {
+        with_var("LESAVKA_ALLOW_SOFTWARE_VIDEO", Some(enabled), || {
+            assert!(video_support::software_video_fallback_allowed());
+        });
+        with_var("LESAVKA_ALLOW_VULKAN_H264_DECODER", Some(enabled), || {
+            assert!(video_support::h264_decoder_preference_order().contains(&"vulkanh264dec"));
+        });
+    }
+}
+
+#[test]
+fn hardware_decoder_classifier_names_each_supported_route() {
+    for name in [
+        "nvh264dec",
+        "nvh264sldec",
+        "vulkanh264dec",
+        "vah264dec",
+        "vaapih264dec",
+        "v4l2h264dec",
+        "v4l2slh264dec",
+    ] {
+        assert!(video_support::is_hardware_h264_decoder(name));
+    }
+    assert!(!video_support::is_hardware_h264_decoder("decodebin"));
+    assert!(!video_support::is_hardware_h264_decoder("avdec_h264"));
 }
 
 #[test]