2 files changed, 54 insertions, 0 deletions
diff --git a/nvdmirror/failsetcache.go b/nvdmirror/failsetcache.go
new file mode 100644
index 0000000..ed5679b
--- /dev/null
+++ b/nvdmirror/failsetcache.go
@@ -0,0 +1,25 @@
+package nvdmirror
+
+import (
+  "fmt"
+)
+
+// Mock cache implementation that fails on Set().
+type FailSetCache byte
+
+// Get cache value.  Always returns not found.
+func (me FailSetCache) Get(_ string) (map[string]string, bool) {
+  return nil, false
+}
+
+// Set cache value (fails unconditionally).
+func (me FailSetCache) Set(s string, _ map[string]string) error {
+  return fmt.Errorf("set failed: %s", s)
+}
+
+// Close cache.  Always succeeds
+func (me FailSetCache) Close() error {
+  return nil
+}
+
+
diff --git a/nvdmirror/failsetcache_test.go b/nvdmirror/failsetcache_test.go
new file mode 100644
index 0000000..8e20a33
--- /dev/null
+++ b/nvdmirror/failsetcache_test.go
@@ -0,0 +1,29 @@
+package nvdmirror
+
+import "testing"
+
+func TestFailSetCache(t *testing.T) {
+  var data map[string]string
+  var cache FailSetCache
+
+  // test get
+  t.Run("Get", func(t *testing.T) {
+    if got, ok := cache.Get("foo"); ok {
+      t.Errorf("got %v, exp !ok", got)
+    }
+  })
+
+  // test set
+  t.Run("Set", func(t *testing.T) {
+    if err := cache.Set("bar", data); err == nil {
+      t.Errorf("got success, exp err")
+    }
+  })
+
+  // test Close
+  t.Run("Close", func(t *testing.T) {
+    if err := cache.Close(); err != nil {
+      t.Error(err)
+    }
+  })
+}