diff --git a/src/tests/jf_test_34.F90 b/src/tests/jf_test_34.F90
new file mode 100644
index 0000000000..549751726e
--- /dev/null
+++ b/src/tests/jf_test_34.F90
@@ -0,0 +1,165 @@
+!*****************************************************************************************
+!>
+!  Module for the 34th unit test.
+
+module jf_test_34_mod
+
+    use json_module, rk => json_rk, lk => json_lk, ik => json_ik, ck => json_ck, cdk => json_cdk
+    use, intrinsic :: iso_fortran_env , only: error_unit, output_unit
+
+    implicit none
+
+    private
+    public :: test_34
+
+contains
+
+    subroutine test_34(error_cnt)
+
+    !! Test some of more obscure routines and exception cases.
+
+    implicit none
+
+    integer,intent(out) :: error_cnt
+
+    type(json_core) :: json
+    type(json_value),pointer :: p,e
+    integer(IK) :: max_str_len
+    logical(LK) :: found
+    logical(LK) :: strict_type_checking
+    integer :: i !! counter
+    integer(IK),dimension(:),allocatable :: ilen
+    character(kind=CK,len=:),allocatable :: str
+    logical(LK) :: is_matrix
+    integer(IK) :: var_type
+    integer(IK) :: n_sets
+    integer(IK) :: set_size
+    character(kind=CK,len=:),allocatable :: name
+
+    error_cnt = 0
+
+    write(error_unit,'(A)') ''
+    write(error_unit,'(A)') '================================='
+    write(error_unit,'(A)') '   TEST 34'
+    write(error_unit,'(A)') '================================='
+    write(error_unit,'(A)') ''
+
+    ! test initialize_json_core:
+    json = json_core( escape_solidus = .true.,&
+                      stop_on_error = .true.)
+    call json%initialize(path_mode=1_IK)
+    call json%initialize(stop_on_error = .false.)
+
+    ! invalid path mode:
+    call json%initialize(path_mode=-999_IK)
+    call json%clear_exceptions()
+
+    ! string_info:
+    do i = 1, 2
+
+        strict_type_checking = i==1
+
+        call json%initialize(strict_type_checking=strict_type_checking)
+
+        ! with found:
+        call json%create_string(p,'string','abc')
+        call json%string_info(p,max_str_len=max_str_len,ilen=ilen,found=found)
+        call json%destroy(p)
+
+        call json%create_array(p,'integer_array')
+        call json%create_integer(e,1,CK_'')
+        call json%add(p,e)
+        call json%string_info(p,max_str_len=max_str_len,ilen=ilen,found=found)
+        call json%destroy(p)
+
+        ! without found:
+        call json%create_string(p,'string','abc')
+        call json%string_info(p,max_str_len=max_str_len,ilen=ilen)
+        call json%clear_exceptions()
+        call json%destroy(p)
+
+        call json%create_array(p,'integer_array')
+        call json%create_integer(e,1,CK_'')
+        call json%add(p,e)
+        call json%string_info(p,max_str_len=max_str_len,ilen=ilen)
+        call json%clear_exceptions()
+        call json%destroy(p)
+
+    end do
+
+    ! json_matrix_info:
+    do i = 1, 3
+
+        select case (i)
+        case(1)
+            ! valid matrix:
+            str = CK_'{"matrix":[[1,2,3,4],[5,6,7,8],[9,10,11,12]]}'
+        case(2)
+            ! not valid (wrong number of elements)
+            str = CK_'{"matrix":[[1,2,3],[5,6,7,8],[9,10,11,12]]}'
+        case(3)
+            ! not valid (not same types)
+            str = CK_'{"matrix":[["a",2,3,4],[5,6,7,8],[9,10,11,12]]}'
+        end select
+
+        call json%initialize()
+        call json%parse(p,str)
+
+        call json%matrix_info(p,is_matrix,var_type,&
+                                n_sets,set_size,name)
+        call json%initialize()
+
+        ! without found:
+        call json%matrix_info(p,'path.not.there',is_matrix,&
+                               var_type=var_type,n_sets=n_sets,&
+                               set_size=set_size,name=name)
+        call json%initialize()
+
+        call json%matrix_info(p,'matrix',is_matrix,&
+                               var_type=var_type,n_sets=n_sets,&
+                               set_size=set_size,name=name)
+        call json%initialize()
+
+        ! with found:
+        call json%matrix_info(p,'path.not.there',is_matrix,&
+                               var_type=var_type,n_sets=n_sets,&
+                               set_size=set_size,name=name,&
+                               found=found)
+        call json%initialize()
+
+        call json%matrix_info(p,'matrix',is_matrix,&
+                               var_type=var_type,n_sets=n_sets,&
+                               set_size=set_size,name=name,&
+                               found=found)
+        call json%initialize()
+
+        call json%destroy(p)
+
+    end do
+
+    ! rename:
+    call json%initialize(trailing_spaces_significant=.true.)
+    call json%create_integer(p,1,CK_'a')
+    call json%rename(p,CK_'b  ')
+
+    end subroutine test_34
+
+end module jf_test_34_mod
+!*****************************************************************************************
+
+#ifndef INTERGATED_TESTS
+!*****************************************************************************************
+program jf_test_34
+
+    !! 34th unit test.
+
+    use jf_test_34_mod , only: test_34
+    implicit none
+    integer :: n_errors
+    n_errors = 0
+    call test_34(n_errors)
+    if (n_errors /= 0) stop 1
+
+end program jf_test_34
+!*****************************************************************************************
+#endif