diff --git a/test/units/TEST-07-PID1.nft.sh b/test/units/TEST-07-PID1.nft.sh
index dbfefc281f..3713cd6c86 100755
--- a/test/units/TEST-07-PID1.nft.sh
+++ b/test/units/TEST-07-PID1.nft.sh
@@ -24,12 +24,14 @@ systemd-run --unit test-nft.service --service-type=exec -p DynamicUser=yes \
             -p 'NFTSet=cgroup:inet:sd_test:c user:inet:sd_test:u group:inet:sd_test:g' sleep 10000
 run nft list set inet sd_test c
 grep -qF "test-nft.service" "$RUN_OUT"
-uid=$(userdbctl user --json=short test-nft | jq .uid)
-run nft list set inet sd_test u
-grep -qF "$uid" "$RUN_OUT"
-gid=$(userdbctl user --json=short test-nft | jq .gid)
-run nft list set inet sd_test g
-grep -qF "$gid" "$RUN_OUT"
+if command -v userdbctl >/dev/null; then
+    uid=$(userdbctl user --json=short test-nft | jq .uid)
+    run nft list set inet sd_test u
+    grep -qF "$uid" "$RUN_OUT"
+    gid=$(userdbctl user --json=short test-nft | jq .gid)
+    run nft list set inet sd_test g
+    grep -qF "$gid" "$RUN_OUT"
+fi
 systemctl stop test-nft.service
 
 # scope
diff --git a/test/units/TEST-13-NSPAWN.nspawn.sh b/test/units/TEST-13-NSPAWN.nspawn.sh
index a6f5b32f62..4d38054d94 100755
--- a/test/units/TEST-13-NSPAWN.nspawn.sh
+++ b/test/units/TEST-13-NSPAWN.nspawn.sh
@@ -405,12 +405,18 @@ testcase_check_default_inaccessible_paths() {
     # Taken from src/nspawn/nspawn-mount.c:mount_all()
     inaccessible_paths=(
         "/proc/kallsyms"
-        "/proc/kcore"
         "/proc/keys"
         "/proc/sysrq-trigger"
         "/proc/timer_list"
     )
 
+    # /proc/kcore may not exist on some kernels, e.g. Alpine/postmarketOS.
+    if [[ -e /proc/kcore ]]; then
+        inaccessible_paths+=(
+            "/proc/kcore"
+        )
+    fi
+
     root="$(mktemp -d /var/lib/machines/TEST-13-NSPAWN.default_inaccessible_paths.XXX)"
     container="$(basename "$root")"
     create_dummy_container "$root"
@@ -1586,6 +1592,7 @@ testcase_boot_param_split() {
     # Replace the init binary with a stub that records the argv and environment nspawn passes to it,
     # so we can verify that kernel-cmdline-style KEY=VALUE arguments are split between PID 1's
     # environment and argv the same way the kernel splits them.
+    mkdir -p "$root/usr/lib/systemd"
     cat >"$root/usr/lib/systemd/systemd" <<'EOF'
 #!/bin/bash
 set -e
diff --git a/test/units/TEST-13-NSPAWN.pull-oci.sh b/test/units/TEST-13-NSPAWN.pull-oci.sh
index e673b711f0..bd42aa0af5 100755
--- a/test/units/TEST-13-NSPAWN.pull-oci.sh
+++ b/test/units/TEST-13-NSPAWN.pull-oci.sh
@@ -126,13 +126,13 @@ systemd-mstack -U /tmp/ooo
 
 ls -alR /home/testuser/.local/state/machines/ocicombo.mstack
 
-run0 -u testuser importctl list-images --user | grep -q ocicombo
+run0 -u testuser importctl list-images --user | grep ocicombo >/dev/null
 
 ls -alR /home/testuser/.local/state/machines/ocicombo.mstack
 
-run0 -u testuser systemd-nspawn -q --pipe -M ocicombo /sbin/init | grep -q luftikus
+run0 -u testuser systemd-nspawn -q --pipe -M ocicombo /sbin/init | grep luftikus >/dev/null
 
-run0 -u testuser --pipe systemd-run -q --unit=fimpel --user -p PrivateUsers=managed -p RootMStack=/home/testuser/.local/state/machines/ocicombo.mstack --pipe /sbin/init | grep -q luftikus
+run0 -u testuser --pipe systemd-run -q --unit=fimpel --user -p PrivateUsers=managed -p RootMStack=/home/testuser/.local/state/machines/ocicombo.mstack --pipe /sbin/init | grep luftikus >/dev/null
 
 run0 -u testuser machinectl list-images -a --user
 
diff --git a/test/units/TEST-46-HOMED.sh b/test/units/TEST-46-HOMED.sh
index 0642eca280..660ccab18a 100755
--- a/test/units/TEST-46-HOMED.sh
+++ b/test/units/TEST-46-HOMED.sh
@@ -54,12 +54,6 @@ systemctl kill -sUSR1 systemd-homed
 testcase_basic() {
     local TMP_SKEL
 
-    . /etc/os-release
-    if [[ "${ID_LIKE:-}" == alpine ]] && ! systemd-detect-virt -cq; then
-        # luks seems to be broken on alpine/postmarketos.
-        return 0
-    fi
-
     TMP_SKEL=$(mktemp -d)
     echo hogehoge >"$TMP_SKEL"/hoge
 
@@ -274,12 +268,6 @@ testcase_basic() {
 }
 
 testcase_blob() {
-    . /etc/os-release
-    if [[ "${ID_LIKE:-}" == alpine ]] && ! systemd-detect-virt -cq; then
-        # luks seems to be broken on alpine/postmarketos.
-        return 0
-    fi
-
     # blob directory tests
     # See docs/USER_RECORD_BLOB_DIRS.md
     checkblob() {
diff --git a/test/units/TEST-50-DISSECT.dissect.sh b/test/units/TEST-50-DISSECT.dissect.sh
index 65e684fa07..136444532d 100755
--- a/test/units/TEST-50-DISSECT.dissect.sh
+++ b/test/units/TEST-50-DISSECT.dissect.sh
@@ -411,7 +411,7 @@ ExecStart=bash -c ' \\
         sleep 0.1; \\
     done; \\
     mount; \\
-    mount | grep -F "on /tmp/img type squashfs" | grep -q -F "nosuid"; \\
+    mount | grep -F "on /tmp/img type squashfs" | grep -F "nosuid" >/dev/null; \\
 '
 EOF
 systemctl start testservice-50d.service
diff --git a/test/units/TEST-50-DISSECT.mountfsd.sh b/test/units/TEST-50-DISSECT.mountfsd.sh
index 12a72f8257..d25743502d 100755
--- a/test/units/TEST-50-DISSECT.mountfsd.sh
+++ b/test/units/TEST-50-DISSECT.mountfsd.sh
@@ -175,13 +175,13 @@ EOF
     systemd-run -M testuser@ --user --pipe --wait \
         --property RootImage="$MINIMAL_IMAGE.gpt" \
         --property RootImageOptions="root:nosuid" \
-        sh -c "test -e \"/dev/mapper/${MINIMAL_IMAGE_ROOTHASH}-verity\" && mount | grep -F squashfs | grep -q -F nosuid"
+        sh -c "test -e \"/dev/mapper/${MINIMAL_IMAGE_ROOTHASH}-verity\" && mount | grep -F squashfs | grep -F nosuid >/dev/null"
 
     systemd-run -M testuser@ --user --pipe --wait \
         --property RootImage="$MINIMAL_IMAGE.raw" \
         --property ExtensionImages=/tmp/app0.raw \
         --property MountImages=/tmp/app0.raw:/var/tmp:nosuid \
-        sh -c "test -e \"/dev/mapper/${MINIMAL_IMAGE_ROOTHASH}-verity\" && test -e \"/dev/mapper/$(</tmp/app0.roothash)-verity\" && mount | grep -F /var/tmp | grep -q -F nosuid"
+        sh -c "test -e \"/dev/mapper/${MINIMAL_IMAGE_ROOTHASH}-verity\" && test -e \"/dev/mapper/$(</tmp/app0.roothash)-verity\" && mount | grep -F /var/tmp | grep -F nosuid >/dev/null"
 
     rm -f /etc/polkit-1/rules.d/mountoptions.rules
     systemctl try-reload-or-restart polkit.service
diff --git a/test/units/TEST-58-REPART.sh b/test/units/TEST-58-REPART.sh
index 319b682298..ba71fcb99d 100755
--- a/test/units/TEST-58-REPART.sh
+++ b/test/units/TEST-58-REPART.sh
@@ -1951,7 +1951,7 @@ EOF
     touch "$imgs/empty-password"
 
     # the expectation for hmac-sha256 is 'integrity: hmac(sha256)'
-    cryptsetup luksDump "${loop}p1" | grep -q "integrity: $(echo "$1" | sed -r 's/^hmac-(.*)$/hmac(\1)/')"
+    cryptsetup luksDump "${loop}p1" | grep "integrity: $(echo "$1" | sed -r 's/^hmac-(.*)$/hmac(\1)/')" >/dev/null
 
     cryptsetup open --type=luks2 --key-file="$imgs/empty-password" "${loop}p1" "$volume"
     dmsetup status > "$dmstatus"
@@ -2149,7 +2149,7 @@ testcase_block_device_replace() {
 
     local defs imgs btrfs_mntpoint_plain btrfs_mntpoint_encrypted
     local loop loop_btrfs_plain loop_btrfs_encrypted
-    local encrypted_device
+    local dm_btrfs_encrypted encrypted_device
 
     btrfs_mntpoint_plain="$(mktemp --directory "/tmp/test-repart.btrfs-mntpoint-plain.XXXXXXXXXX")"
     btrfs_mntpoint_encrypted="$(mktemp --directory "/tmp/test-repart.btrfs-mntpoint-encrypted.XXXXXXXXXX")"
@@ -2216,7 +2216,13 @@ EOF
                    "${loop}"
 
     assert_eq "$(findmnt "${btrfs_mntpoint_plain}" -o SOURCE -n)" "${loop}p1"
-    assert_eq "$(findmnt "${btrfs_mntpoint_encrypted}" -o SOURCE -n)" "/dev/mapper/btrfs-replace-encrypted"
+    dm_btrfs_encrypted="$(findmnt "${btrfs_mntpoint_encrypted}" -o SOURCE -n)"
+    if [[ "$dm_btrfs_encrypted" != "/dev/mapper/btrfs-replace-encrypted" ]]; then
+        # When libdevmapper is built without UDEV_SYNC_SUPPORT (e.g. on Alpine/postmarketOS),
+        # it creates a device node under /dev/mapper/ instead of relying on udev to create a symlink.
+        # In this case, verify that both device nodes refer to the same underlying device.
+        assert_eq "$(stat -c %Hr:%Lr "$dm_btrfs_encrypted")" "$(stat -c %Hr:%Lr /dev/mapper/btrfs-replace-encrypted)"
+    fi
     encrypted_device="/sys/dev/block/$(dmsetup table /dev/mapper/btrfs-replace-encrypted | cut -d" " -f7)"
     assert_eq "$(udevadm info --query=property --property=DEVNAME --value "${encrypted_device}")" "${loop}p2"
     grep -q tada "${btrfs_mntpoint_plain}/magic-plain"
diff --git a/test/units/TEST-74-AUX-UTILS.sysusers.sh b/test/units/TEST-74-AUX-UTILS.sysusers.sh
index 2a06e85bfd..6e3fcac8c5 100755
--- a/test/units/TEST-74-AUX-UTILS.sysusers.sh
+++ b/test/units/TEST-74-AUX-UTILS.sysusers.sh
@@ -11,11 +11,13 @@ u unlockedtestuser - "An unlocked system user" / /bin/bash
 u! lockedtestuser - "A locked system user" / /bin/bash
 EOF
 
-userdbctl -j user unlockedtestuser
-userdbctl -j user lockedtestuser
+if command -v userdbctl >/dev/null; then
+    userdbctl -j user unlockedtestuser
+    userdbctl -j user lockedtestuser
 
-assert_eq "$(userdbctl -j user unlockedtestuser | jq .locked)" "null"
-assert_eq "$(userdbctl -j user lockedtestuser | jq .locked)" "true"
+    assert_eq "$(userdbctl -j user unlockedtestuser | jq .locked)" "null"
+    assert_eq "$(userdbctl -j user lockedtestuser | jq .locked)" "true"
+fi
 
 at_exit() {
     set +e
diff --git a/test/units/TEST-74-AUX-UTILS.userdbctl.sh b/test/units/TEST-74-AUX-UTILS.userdbctl.sh
index fdfff1a65c..dd57c6fee5 100755
--- a/test/units/TEST-74-AUX-UTILS.userdbctl.sh
+++ b/test/units/TEST-74-AUX-UTILS.userdbctl.sh
@@ -3,6 +3,11 @@
 set -eux
 set -o pipefail
 
+if ! command -v userdbctl >/dev/null; then
+    echo "userdbctl is not installed, skipping the test."
+    exit 0
+fi
+
 # shellcheck source=test/units/util.sh
 . "$(dirname "$0")"/util.sh
 
diff --git a/test/units/TEST-74-AUX-UTILS.varlinkctl.sh b/test/units/TEST-74-AUX-UTILS.varlinkctl.sh
index ec71e2641e..0e95360000 100755
--- a/test/units/TEST-74-AUX-UTILS.varlinkctl.sh
+++ b/test/units/TEST-74-AUX-UTILS.varlinkctl.sh
@@ -207,7 +207,7 @@ varlinkctl call /run/systemd/io.systemd.Manager io.systemd.Manager.Reexecute '{}
 # Wait for the manager to finish re-exec before proceeding — the user manager
 # tests below use systemd-run which requires a functional PID 1.
 for _ in {1..10}; do
-    if systemctl is-system-running 2>/dev/null | grep -qE 'running|degraded'; then
+    if systemctl is-system-running 2>/dev/null | grep -E 'running|degraded' >/dev/null; then
         break
     fi
     sleep 1