diff --git a/.github/scripts/check-coverage.sh b/.github/scripts/check-coverage.sh
index 47caa81..cc4956e 100755
--- a/.github/scripts/check-coverage.sh
+++ b/.github/scripts/check-coverage.sh
@@ -2,7 +2,7 @@
 
 make coverage
 
-target=70.0
+target=74.0
 p=$(lcov --summary coverage.info | grep "lines" | grep -Eo "[0-9]+\.[0-9]+")
 if (( $(echo "$p < $target" | bc -l) )); then
     echo "Error: Coverage $p% is less than $target%"
diff --git a/Makefile b/Makefile
index 91a5f0e..1429055 100644
--- a/Makefile
+++ b/Makefile
@@ -63,10 +63,12 @@ $(BIN_DIR)/test_disk.raw: $(BIN_DIR)/test_image.raw
 	truncate --size 100M $@
 
 check:
-	sudo ./build/bin/test_ubi --cpumask [0,1,2] --json test/test_conf.json $(TEST_BDEVS)
+	sudo ./build/bin/test_ubi --cpumask [0,1,2] --json test/test_conf.json \
+		--json-ignore-init-errors $(TEST_BDEVS)
 
 valgrind:
-	sudo valgrind ./build/bin/memcheck_ubi --cpumask [0] --json test/test_conf.json $(TEST_BDEVS)
+	sudo valgrind ./build/bin/memcheck_ubi --cpumask [0] \
+		--json-ignore-init-errors --json test/test_conf.json $(TEST_BDEVS)
 
 coverage:
 	lcov --capture --directory . --exclude=`pwd`/test/'*.c' --no-external --output-file coverage.info > /dev/null
diff --git a/test/test_conf.json b/test/test_conf.json
index 3ed1449..fd644c7 100644
--- a/test/test_conf.json
+++ b/test/test_conf.json
@@ -3,6 +3,12 @@
     {
       "subsystem": "bdev",
       "config": [
+        {
+          "method": "bdev_ubi_create",
+          "params": {
+            "name": "ubi_with_missing_args"
+          }
+        },
         {
           "method": "bdev_malloc_create",
           "params": {
@@ -11,6 +17,36 @@
             "num_blocks": 204800
           }
         },
+        {
+          "method": "bdev_ubi_create",
+          "params": {
+            "name": "ubi_to_be_deleted",
+            "base_bdev": "malloc0",
+            "image_path": "build/bin/test_image.raw",
+            "stripe_size_kb": 1024,
+            "copy_on_read": false,
+            "directio": false,
+            "no_sync": false
+          }
+        },
+        {
+          "method": "bdev_ubi_delete",
+          "params": {
+            "name": "invalid bdev name"
+          }
+        },
+        {
+          "method": "bdev_ubi_delete",
+          "params": {
+            "invalid_param": 1
+          }
+        },
+        {
+          "method": "bdev_ubi_delete",
+          "params": {
+            "name": "ubi_to_be_deleted"
+          }
+        },
         {
           "method": "bdev_ubi_create",
           "params": {