Added JSON marshalling test for actions_secrets_test.go

Author: ashmi8

github/actions_secrets_test.go

@@ -92,6 +92,54 @@ func TestPublicKey_UnmarshalJSON(t *testing.T) {
 	}
 }
 
+func TestPublicKey_MarshalJSON(t *testing.T) {
+	t.Parallel()
+	testCases := map[string]struct {
+		input    PublicKey
+		wantJSON string
+		wantErr  bool
+	}{
+		"Empty": {
+			input:    PublicKey{},
+			wantJSON: `{"key_id":null,"key":null}`,
+			wantErr:  false,
+		},
+		"Valid KeyID and Key": {
+			input:    PublicKey{KeyID: Ptr("1234"), Key: Ptr("2Sg8iYjAxxmI2LvUXpJjkYrMxURPc8r+dB7TJyvv1234")},
+			wantJSON: `{"key_id":"1234","key":"2Sg8iYjAxxmI2LvUXpJjkYrMxURPc8r+dB7TJyvv1234"}`,
+			wantErr:  false,
+		},
+		"Nil KeyID": {
+			input:    PublicKey{KeyID: nil, Key: Ptr("abc")},
+			wantJSON: `{"key_id":null,"key":"abc"}`,
+			wantErr:  false,
+		},
+		"Nil Key": {
+			input:    PublicKey{KeyID: Ptr("1234"), Key: nil},
+			wantJSON: `{"key_id":"1234","key":null}`,
+			wantErr:  false,
+		},
+	}
+
+	for name, tt := range testCases {
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			data, err := json.Marshal(tt.input)
+			if err != nil && !tt.wantErr {
+				t.Errorf("PublicKey.MarshalJSON returned an unexpected error: %+v", err)
+			}
+			if err == nil && tt.wantErr {
+				t.Error("PublicKey.MarshalJSON returned nil instead of an error")
+			}
+			got := string(data)
+			if got != tt.wantJSON {
+				t.Errorf("PublicKey.MarshalJSON expected JSON %s, got %s", tt.wantJSON, got)
+			}
+		})
+	}
+}
+
+
 func TestActionsService_GetRepoPublicKey(t *testing.T) {
 	t.Parallel()
 	client, mux, _ := setup(t)