diff --git a/internal/signalio/json.go b/internal/signalio/json.go
index bea884e2a..d767dc6cf 100644
--- a/internal/signalio/json.go
+++ b/internal/signalio/json.go
@@ -16,7 +16,6 @@ package signalio
 
 import (
 	"encoding/json"
-	"fmt"
 	"io"
 	"sync"
 
@@ -51,10 +50,9 @@ func (w *jsonWriter) WriteSignals(signals []signal.Set, extra ...Field) error {
 				d = make(map[string]any)
 				data[ns] = d
 			}
-			nsData, ok := d.(map[string]any)
-			if !ok {
-				return fmt.Errorf("failed to get map for namespace: %s", ns)
-			}
+			nsData := d.(map[string]any)
+			// we don't need to check for an error here (the above line) because d is always a map[string]any
+
 			for k, v := range innerM {
 				nsData[k] = v
 			}
@@ -63,6 +61,7 @@ func (w *jsonWriter) WriteSignals(signals []signal.Set, extra ...Field) error {
 	for _, f := range extra {
 		data[f.Key] = f.Value
 	}
+
 	w.mu.Lock()
 	defer w.mu.Unlock()
 	return w.encoder.Encode(data)
diff --git a/internal/signalio/json_test.go b/internal/signalio/json_test.go
new file mode 100644
index 000000000..44bb9230a
--- /dev/null
+++ b/internal/signalio/json_test.go
@@ -0,0 +1,71 @@
+// Copyright 2022 Criticality Score Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package signalio
+
+import (
+	"encoding/json"
+	"github.com/ossf/criticality_score/internal/collector/signal"
+	"io"
+	"testing"
+)
+
+type testJsonWriterSet struct {
+	UpdatedCount signal.Field[int]
+	Field        string
+}
+
+func (t testJsonWriterSet) Namespace() signal.Namespace {
+	return "test"
+}
+
+type mockWriterJSON struct {
+	written []byte
+}
+
+func (m *mockWriterJSON) Write(p []byte) (n int, err error) {
+	return 0, nil
+}
+
+func Test_jsonWriter_WriteSignals(t *testing.T) {
+	type args struct {
+		signals []signal.Set
+		extra   []Field
+	}
+	test := struct {
+		name    string
+		encoder *json.Encoder
+		args    args
+		wantErr bool
+	}{
+		name:    "default",
+		encoder: json.NewEncoder(io.Writer(&mockWriterJSON{})),
+		args: args{
+			signals: []signal.Set{
+				&testJsonWriterSet{},
+			},
+			extra: []Field{
+				{
+					Key:   "extra",
+					Value: "value",
+				},
+			},
+		},
+	}
+
+	w := JSONWriter(&mockWriterJSON{})
+	if err := w.WriteSignals(test.args.signals, test.args.extra...); (err != nil) != test.wantErr {
+		t.Errorf("WriteSignals() error = %v, wantErr %v", err, test.wantErr)
+	}
+}