diff --git a/test/dmtesthdf5.f90 b/test/dmtesthdf5.f90
index c9736db..ce9e90f 100644
--- a/test/dmtesthdf5.f90
+++ b/test/dmtesthdf5.f90
@@ -10,19 +10,21 @@ program dmtesthdf5
     character(len=*), parameter :: FILE_PATH  = 'testobserv.hdf5'
     character(len=*), parameter :: GROUP_NAME = 'timeseries'
 
-    integer, parameter :: NTESTS = 6
+    integer, parameter :: NTESTS = 7
 
     type(test_type) :: tests(NTESTS)
     logical         :: stats(NTESTS)
 
+    call dm_init()
+
     tests(1) = test_type('dmtesthdf5.test01', test01)
     tests(2) = test_type('dmtesthdf5.test02', test02)
     tests(3) = test_type('dmtesthdf5.test03', test03)
     tests(4) = test_type('dmtesthdf5.test04', test04)
     tests(5) = test_type('dmtesthdf5.test05', test05)
     tests(6) = test_type('dmtesthdf5.test06', test06)
+    tests(7) = test_type('dmtesthdf5.test07', test07)
 
-    call dm_init()
     call dm_test_run(tests, stats, dm_env_has('NO_COLOR'))
 contains
     logical function test01() result(stat)
@@ -353,4 +355,36 @@ logical function test06() result(stat)
         print *, 'Clean-up ...'
         rc = dm_hdf5_destroy()
     end function test06
+
+    logical function test07() result(stat)
+        !! Tests availale filters.
+        integer :: rc
+        logical :: avail(4)
+
+        stat = TEST_FAILED
+
+        print *, 'Initialising ...'
+        rc = dm_hdf5_init()
+        call dm_error_out(rc)
+        if (dm_is_error(rc)) return
+
+        print *, 'Checking available filters ...'
+        avail = .false.
+        rc = dm_hdf5_filter_available(HDF5_FILTER_DEFLATE,    avail(HDF5_FILTER_DEFLATE));    call dm_error_out(rc)
+        rc = dm_hdf5_filter_available(HDF5_FILTER_SHUFFLE,    avail(HDF5_FILTER_SHUFFLE));    call dm_error_out(rc)
+        rc = dm_hdf5_filter_available(HDF5_FILTER_FLETCHER32, avail(HDF5_FILTER_FLETCHER32)); call dm_error_out(rc)
+        rc = dm_hdf5_filter_available(HDF5_FILTER_SZIP,       avail(HDF5_FILTER_SZIP));       call dm_error_out(rc)
+
+        print *, 'Deflate...: ', avail(HDF5_FILTER_DEFLATE)
+        print *, 'Shuffle...: ', avail(HDF5_FILTER_SHUFFLE)
+        print *, 'Fletcher32: ', avail(HDF5_FILTER_FLETCHER32)
+        print *, 'SZIP......: ', avail(HDF5_FILTER_SZIP)
+
+        print *, 'Clean-up ...'
+        rc = dm_hdf5_destroy()
+        call dm_error_out(rc)
+        if (dm_is_error(rc)) return
+
+        stat = TEST_PASSED
+    end function test07
 end program dmtesthdf5
diff --git a/test/dmtesthtml.f90 b/test/dmtesthtml.f90
index 56076e9..53dd49a 100644
--- a/test/dmtesthtml.f90
+++ b/test/dmtesthtml.f90
@@ -5,15 +5,17 @@
 program dmtesthtml
     use :: dmpack
     implicit none (type, external)
-    integer, parameter :: NTESTS = 2
+    integer, parameter :: NTESTS = 3
 
-    type(test_type) :: tests(NTESTS)
     logical         :: stats(NTESTS)
+    type(test_type) :: tests(NTESTS)
+
+    call dm_init()
 
     tests(1) = test_type('dmtesthtml.test01', test01)
     tests(2) = test_type('dmtesthtml.test02', test02)
+    tests(3) = test_type('dmtesthtml.test03', test03)
 
-    call dm_init()
     call dm_test_run(tests, stats, dm_env_has('NO_COLOR'))
 contains
     logical function test01() result(stat)
@@ -59,5 +61,17 @@ logical function test02() result(stat)
 
         stat = TEST_PASSED
     end function test02
+
+    logical function test03() result(stat)
+        stat = TEST_FAILED
+
+        print *, 'Basic HTML page ...'
+        print '(72("."))'
+        print '(a)', dm_html_header('Title', 'Sub-Title', 'style.css', brand='Brand')
+        print '(a)', dm_html_footer('Footer' // ASCII_LF, 'script.js')
+        print '(72("."))'
+
+        stat = TEST_PASSED
+    end function test03
 end program dmtesthtml
 
diff --git a/test/dmtestmqueue.f90 b/test/dmtestmqueue.f90
index 945d990..e92d693 100644
--- a/test/dmtestmqueue.f90
+++ b/test/dmtestmqueue.f90
@@ -14,6 +14,8 @@ program dmtestmqueue
     !!      $ export DM_MQUEUE_SKIP=1
     !!      $ ./dmtestmqueue
     !!
+    !! This may be necessary on test platforms where messages queues are not
+    !! available.
     use :: dmpack
     implicit none (type, external)
 
diff --git a/test/dmtestpipe.f90 b/test/dmtestpipe.f90
index 01ef671..b2a4cfe 100644
--- a/test/dmtestpipe.f90
+++ b/test/dmtestpipe.f90
@@ -3,6 +3,18 @@
 ! Author:  Philipp Engel
 ! Licence: ISC
 program dmtestpipe
+    !! Disabled the tests of this program by setting the following environment
+    !! variable:
+    !!
+    !!      DM_PIPE_SKIP - Skip all tests.
+    !!
+    !! For example:
+    !!
+    !!      $ export DM_PIPE_SKIP=1
+    !!      $ ./dmtestpipe
+    !!
+    !! This may be necessary on test platforms where bi-directional pipes are
+    !! not available.
     use, intrinsic :: iso_c_binding, only: c_associated
     use :: dmpack
     implicit none (type, external)
diff --git a/test/dmtestplot.f90 b/test/dmtestplot.f90
index 67fd04c..25c4981 100644
--- a/test/dmtestplot.f90
+++ b/test/dmtestplot.f90
@@ -3,6 +3,18 @@
 ! Author:  Philipp Engel
 ! Licence: ISC
 program dmtestplot
+    !! Disabled the tests of this program by setting the following environment
+    !! variable:
+    !!
+    !!      DM_PIPE_SKIP - Skip all tests.
+    !!
+    !! For example:
+    !!
+    !!      $ export DM_PIPE_SKIP=1
+    !!      $ ./dmtestplot
+    !!
+    !! This may be necessary on test platforms where Gnuplot or bi-directional
+    !! pipes are not available.
     use :: dmpack
     implicit none (type, external)
     integer, parameter :: NTESTS = 1