diff --git a/libgnucash/engine/test/test-address.c b/libgnucash/engine/test/test-address.c
index 334da191d6..df620a8169 100644
--- a/libgnucash/engine/test/test-address.c
+++ b/libgnucash/engine/test/test-address.c
@@ -76,12 +76,13 @@ test_string_fcn (GncAddress *address, const char *message,
                  void (*set) (GncAddress *, const char *str),
                  const char * (*get)(const GncAddress *))
 {
-    char const *str = get_random_string ();
+    char *str = get_random_string ();
 
     do_test (!gncAddressIsDirty (address), "test if start dirty");
     set (address, str);
     do_test (gncAddressIsDirty (address), "test dirty later");
     do_test (g_strcmp0 (get (address), str) == 0, message);
+    g_free (str);
     gncAddressClearDirty (address);
 }
 
diff --git a/libgnucash/engine/test/test-commodities.cpp b/libgnucash/engine/test/test-commodities.cpp
index 089880f9dc..7ed5871678 100644
--- a/libgnucash/engine/test/test-commodities.cpp
+++ b/libgnucash/engine/test/test-commodities.cpp
@@ -72,6 +72,7 @@ test_commodity(void)
         do_test(
             g_strcmp0(fullname, gnc_commodity_get_fullname(com)) == 0,
             "fullnames equal test");
+        g_free (fullname);
 
         do_test(
             g_strcmp0(name_space, gnc_commodity_get_namespace(com)) == 0,
@@ -80,10 +81,12 @@ test_commodity(void)
         do_test(
             g_strcmp0(mnemonic, gnc_commodity_get_mnemonic(com)) == 0,
             "mnemonic equal test");
+        g_free (mnemonic);
 
         do_test(
             g_strcmp0(cusip, gnc_commodity_get_cusip(com)) == 0,
             "cusip equal test");
+        g_free (cusip);
 
         do_test(
             gnc_commodity_get_fraction(com) == fraction,
@@ -126,6 +129,10 @@ test_commodity(void)
 
         com2 = gnc_commodity_new(book, fullname, name_space, mnemonic,
                                  cusip, fraction);
+        g_free (fullname);
+        g_free (mnemonic);
+        g_free (cusip);
+
         do_test(
             gnc_commodity_equiv(com, com2), "commodity equiv");
 
diff --git a/libgnucash/engine/test/test-customer.c b/libgnucash/engine/test/test-customer.c
index fc3cc52eca..b3f5bac789 100644
--- a/libgnucash/engine/test/test-customer.c
+++ b/libgnucash/engine/test/test-customer.c
@@ -111,16 +111,16 @@ test_customer (void)
         g_list_free (list);
     }
     {
-        const char *str = get_random_string();
-        const char *res;
+        char *str = get_random_string();
 
-        res = NULL;
         gncCustomerBeginEdit(customer);
         gncCustomerSetName (customer, str);
         gncCustomerCommitEdit(customer);
-        res = qof_object_printable (GNC_ID_CUSTOMER, customer);
+
+        const char *res = qof_object_printable (GNC_ID_CUSTOMER, customer);
         do_test (res != NULL, "Printable NULL?");
         do_test (g_strcmp0 (str, res) == 0, "Printable equals");
+        g_free (str);
     }
 
     do_test (gncCustomerGetJoblist (customer, TRUE) == NULL, "joblist empty");
@@ -143,7 +143,7 @@ test_string_fcn (QofBook *book, const char *message,
                  const char * (*get)(const GncCustomer *))
 {
     GncCustomer *customer = gncCustomerCreate (book);
-    char const *str = get_random_string ();
+    char *str = get_random_string ();
 
     do_test (!gncCustomerIsDirty (customer), "test if start dirty");
     gncCustomerBeginEdit (customer);
@@ -158,6 +158,7 @@ test_string_fcn (QofBook *book, const char *message,
      */
     // do_test (!gncCustomerIsDirty (customer), "test dirty after commit");
     do_test (g_strcmp0 (get (customer), str) == 0, message);
+    g_free (str);
     gncCustomerSetActive (customer, FALSE);
     count++;
 }
diff --git a/libgnucash/engine/test/test-employee.c b/libgnucash/engine/test/test-employee.c
index 1010febf36..cfefd2e214 100644
--- a/libgnucash/engine/test/test-employee.c
+++ b/libgnucash/engine/test/test-employee.c
@@ -117,15 +117,14 @@ test_employee (void)
         g_list_free (list);
     }
     {
-        const char *str = get_random_string();
-        const char *res;
-        GncAddress *addr;
+        char *str = get_random_string();
 
-        addr = gncEmployeeGetAddr (employee);
+        GncAddress *addr = gncEmployeeGetAddr (employee);
         gncAddressSetName (addr, str);
-        res = qof_object_printable (GNC_ID_EMPLOYEE, employee);
+        const char *res = qof_object_printable (GNC_ID_EMPLOYEE, employee);
         do_test (res != NULL, "Printable NULL?");
         do_test (g_strcmp0 (str, res) == 0, "Printable equals");
+        g_free (str);
     }
 
     qof_book_destroy (book);
@@ -137,7 +136,7 @@ test_string_fcn (QofBook *book, const char *message,
                  const char * (*get)(const GncEmployee *))
 {
     GncEmployee *employee = gncEmployeeCreate (book);
-    char const *str = get_random_string ();
+    char *str = get_random_string ();
 
     do_test (!gncEmployeeIsDirty (employee), "test if start dirty");
     gncEmployeeBeginEdit (employee);
@@ -152,6 +151,7 @@ test_string_fcn (QofBook *book, const char *message,
      */
     // do_test (!gncEmployeeIsDirty (employee), "test dirty after commit");
     do_test (g_strcmp0 (get (employee), str) == 0, message);
+    g_free (str);
     gncEmployeeSetActive (employee, FALSE);
     count++;
 }
diff --git a/libgnucash/engine/test/test-job.c b/libgnucash/engine/test/test-job.c
index 2b5b4f8155..737f168017 100644
--- a/libgnucash/engine/test/test-job.c
+++ b/libgnucash/engine/test/test-job.c
@@ -113,13 +113,13 @@ test_job (void)
     }
 #endif
     {
-        const char *str = get_random_string();
-        const char *res;
+        char *str = get_random_string();
 
         gncJobSetName (job, str);
-        res = qof_object_printable (GNC_ID_JOB, job);
+        const char *res = qof_object_printable (GNC_ID_JOB, job);
         do_test (res != NULL, "Printable NULL?");
         do_test (g_strcmp0 (str, res) == 0, "Printable equals");
+        g_free (str);
     }
     {
         GList *list;
@@ -154,7 +154,7 @@ test_string_fcn (QofBook *book, const char *message,
                  const char * (*get)(const GncJob *))
 {
     GncJob *job = gncJobCreate (book);
-    char const *str = get_random_string ();
+    char *str = get_random_string ();
 
     do_test (!qof_instance_is_dirty (QOF_INSTANCE(job)), "test if start dirty");
     gncJobBeginEdit (job);
@@ -169,6 +169,7 @@ test_string_fcn (QofBook *book, const char *message,
      */
     // do_test (!qof_instance_is_dirty (QOF_INSTANCE(job)), "test dirty after commit");
     do_test (g_strcmp0 (get (job), str) == 0, message);
+    g_free (str);
     gncJobSetActive (job, FALSE);
     count++;
 }
diff --git a/libgnucash/engine/test/test-vendor.c b/libgnucash/engine/test/test-vendor.c
index 8e3e19cfd7..47bdb057d7 100644
--- a/libgnucash/engine/test/test-vendor.c
+++ b/libgnucash/engine/test/test-vendor.c
@@ -117,13 +117,13 @@ test_vendor (void)
         g_list_free (list);
     }
     {
-        const char *str = get_random_string();
-        const char *res;
+        char *str = get_random_string();
 
         gncVendorSetName (vendor, str);
-        res = qof_object_printable (GNC_ID_VENDOR, vendor);
+        const char *res = qof_object_printable (GNC_ID_VENDOR, vendor);
         do_test (res != NULL, "Printable NULL?");
         do_test (g_strcmp0 (str, res) == 0, "Printable equals");
+        g_free (str);
     }
 
     qof_book_destroy (book);
@@ -135,7 +135,7 @@ test_string_fcn (QofBook *book, const char *message,
                  const char * (*get)(const GncVendor *))
 {
     GncVendor *vendor = gncVendorCreate (book);
-    char const *str = get_random_string ();
+    char *str = get_random_string ();
 
     do_test (!gncVendorIsDirty (vendor), "test if start dirty");
     gncVendorBeginEdit (vendor);
@@ -150,6 +150,7 @@ test_string_fcn (QofBook *book, const char *message,
      */
     // do_test (!gncVendorIsDirty (vendor), "test dirty after commit");
     do_test (g_strcmp0 (get (vendor), str) == 0, message);
+    g_free (str);
     gncVendorSetActive (vendor, FALSE);
     count++;
 }