diff --git a/.covrignore b/.covrignore
index 5c0d0af..e02fd5e 100644
--- a/.covrignore
+++ b/.covrignore
@@ -1,5 +1,4 @@
 ./R/entities.R
-./R/HashTable.R
 ./R/Lrner.R
 ./R/Model.R
 ./R/NewData.R
diff --git a/R/HashTable.R b/R/HashTable.R
index 2076698..af707f3 100644
--- a/R/HashTable.R
+++ b/R/HashTable.R
@@ -22,6 +22,18 @@ HashTable <- R6Class("HashTable",
                                                       parent = emptyenv())
                        },
                        #' @description
+                       #' Printer
+                       #' @param ... (any) \cr
+                       #'
+                       #' @export
+                       #'
+                       print = function (...) {
+                         cat("Class: HashTable\n")
+                         cat(sprintf("id: %s\n", private$id))
+                         cat("-----------------\n")
+                         print(private$key_class)
+                       },
+                       #' @description
                        #' Function to add a key-value pair to the hash table.
                        #' @param key (`character(1)`) \cr
                        #' The key to be added.
@@ -93,18 +105,7 @@ HashTable <- R6Class("HashTable",
                          }
                          invisible(TRUE)
                        },
-                       #' @description
-                       #' Printer
-                       #' @param ... (any) \cr
-                       #'
-                       #' @export
-                       #'
-                       print = function (...) {
-                         cat("Class: HashTable\n")
-                         cat(sprintf("id: %s\n", private$id))
-                         cat("-----------------\n")
-                         print(private$key_class)
-                       },
+
                        #' @description
                        #' Getter of the current object ID.
                        #'
diff --git a/tests/testthat/test-HashTable.R b/tests/testthat/test-HashTable.R
index 81638a9..107bfb2 100644
--- a/tests/testthat/test-HashTable.R
+++ b/tests/testthat/test-HashTable.R
@@ -1,3 +1,45 @@
-test_that("A hash table can be created", {
-  expect_s3_class(HashTable$new(id = "test"), "HashTable")
+hashtable <- HashTable$new(id = "test")
+
+test_that("HashTable: initialize", {
+  expect_s3_class(hashtable, "HashTable")
+  print(hashtable)
+})
+
+test_that("HashTable: add2HashTable", {
+  expect_no_error(hashtable$add2HashTable(key = "obj1",
+                                          value = 2L,
+                                          .class = "test"))
+  expect_no_error(hashtable$add2HashTable(key = "obj1",
+                                          value = 2L,
+                                          .class = "test"))
+  expect_no_error(hashtable$add2HashTable(key = "obj1",
+                                          value = 2L,
+                                          .class = "test2"))
+})
+
+test_that("HashTable: getFromHashTable", {
+  expect_no_error(hashtable$getFromHashTable(key = "obj1"))
+  expect_no_error(hashtable$getFromHashTable(key = "notexists"))
+})
+
+test_that("HashTable: getKeyClass", {
+  expect_no_error(hashtable$getKeyClass())
+})
+
+test_that("HashTable: removeFromHashTable", {
+  expect_no_error(hashtable$removeFromHashTable(key = "obj1"))
+  expect_no_error(hashtable$getFromHashTable(key = "notexists"))
+})
+
+test_that("HashTable: getId", {
+  expect_no_error(hashtable$getId())
+})
+
+test_that("HashTable: getHashTable", {
+  expect_no_error(hashtable$getHashTable())
+})
+
+
+test_that("HashTable: checkClassExist", {
+  expect_no_error(hashtable$checkClassExist(.class = "notexists"))
 })