add end read date

internal/apitest/put_userbook_read_test.go

@@ -20,6 +20,44 @@ func TestPutReadUserBooks_NewReadOk(t *testing.T) {
 	assert.Equal(t, false, book.WantRead)
 }
 
+func TestPutReadUserBooks_NewReadDateOk(t *testing.T) {
+	payload :=
+		`{
+			"read": true,
+			"endDate": "2025-10-20"
+		}`
+	bookId := "9"
+	testPutReadUserBooks(t, payload, bookId, http.StatusOK)
+	book := testGetBook(t, bookId, http.StatusOK)
+	assert.Equal(t, true, book.Read)
+	assert.Equal(t, "2025-10-20", book.EndReadDate)
+}
+
+func TestPutReadUserBooks_UnsetEndDate(t *testing.T) {
+	payload :=
+		`{
+			"read": true,
+			"endDate": "null"
+		}`
+	bookId := "9"
+	testPutReadUserBooks(t, payload, bookId, http.StatusOK)
+	book := testGetBook(t, bookId, http.StatusOK)
+	assert.Equal(t, true, book.Read)
+	assert.Equal(t, "", book.EndReadDate)
+}
+
+func TestPutReadUserBooks_UnsetReadOk(t *testing.T) {
+	payload :=
+		`{
+			"read": false
+		}`
+	bookId := "9"
+	testPutReadUserBooks(t, payload, bookId, http.StatusOK)
+	book := testGetBook(t, bookId, http.StatusOK)
+	assert.Equal(t, false, book.Read)
+	assert.Equal(t, "", book.EndReadDate)
+}
+
 func testPutReadUserBooks(t *testing.T, payload string, bookId string, expectedCode int) {
 	testutils.TestBookPutCallWithDemoPayload(t, payload, bookId, expectedCode, "/book/"+bookId+"/read")
 }