diff --git a/tests/ofproto-dpif.at b/tests/ofproto-dpif.at
index 1443d73..bbd081e 100644
--- a/tests/ofproto-dpif.at
+++ b/tests/ofproto-dpif.at
@@ -5812,21 +5812,21 @@ AT_CHECK([ovs-appctl netdev-dummy/receive p1 'in_port(1),eth(src=50:54:00:00:00:
 AT_CHECK([ovs-appctl netdev-dummy/receive p2 'in_port(2),eth(src=50:54:00:00:00:07,dst=50:54:00:00:00:05),eth_type(0x0800),ipv4(src=192.168.0.2,dst=192.168.0.1,proto=1,tos=0,ttl=64,frag=no),icmp(type=0,code=0)'])
 AT_CHECK([ovs-appctl netdev-dummy/receive p3 'in_port(3),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x0800),ipv4(src=10.0.0.2,dst=10.0.0.1,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0)'])
 ovs-appctl revalidator/wait
-AT_CHECK([ovs-appctl dpif/dump-flows br0 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows br0 | strip_ufid | strip_used | sort], [0], [dnl
 recirc_id(0),in_port(1),eth_type(0x0800),ipv4(frag=no), packets:0, bytes:0, used:never, actions:drop
 recirc_id(0),in_port(2),eth_type(0x0800),ipv4(frag=no), packets:0, bytes:0, used:never, actions:drop
 ])
 
-AT_CHECK([ovs-appctl dpif/dump-flows br1 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows br1 | strip_ufid | strip_used | sort], [0], [dnl
 recirc_id(0),in_port(3),eth_type(0x0800),ipv4(frag=no), packets:0, bytes:0, used:never, actions:drop
 ])
 
-AT_CHECK([ovs-appctl dpif/dump-flows -m br0 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows -m br0 | strip_ufid | strip_used | sort], [0], [dnl
 skb_priority(0/0),skb_mark(0/0),recirc_id(0),dp_hash(0/0),in_port(p1),eth(src=50:54:00:00:00:05/00:00:00:00:00:00,dst=50:54:00:00:00:07/00:00:00:00:00:00),eth_type(0x0800),ipv4(src=192.168.0.1/0.0.0.0,dst=192.168.0.2/0.0.0.0,proto=1/0,tos=0/0,ttl=64/0,frag=no),icmp(type=8/0,code=0/0), packets:0, bytes:0, used:never, actions:drop
 skb_priority(0/0),skb_mark(0/0),recirc_id(0),dp_hash(0/0),in_port(p2),eth(src=50:54:00:00:00:07/00:00:00:00:00:00,dst=50:54:00:00:00:05/00:00:00:00:00:00),eth_type(0x0800),ipv4(src=192.168.0.2/0.0.0.0,dst=192.168.0.1/0.0.0.0,proto=1/0,tos=0/0,ttl=64/0,frag=no),icmp(type=0/0,code=0/0), packets:0, bytes:0, used:never, actions:drop
 ])
 
-AT_CHECK([ovs-appctl dpif/dump-flows -m br1 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows -m br1 | strip_ufid | strip_used | sort], [0], [dnl
 skb_priority(0/0),skb_mark(0/0),recirc_id(0),dp_hash(0/0),in_port(p3),eth(src=50:54:00:00:00:09/00:00:00:00:00:00,dst=50:54:00:00:00:0a/00:00:00:00:00:00),eth_type(0x0800),ipv4(src=10.0.0.2/0.0.0.0,dst=10.0.0.1/0.0.0.0,proto=1/0,tos=0/0,ttl=64/0,frag=no),icmp(type=8/0,code=0/0), packets:0, bytes:0, used:never, actions:drop
 ])
 
@@ -5879,7 +5879,7 @@ for dl_src in 00 01; do
     AT_CHECK([ovs-appctl netdev-dummy/receive p1 "505400000007 6066666666$dl_src 8847 00014020 00014120 45 00 00 2c 00 00 00 00 40 06 3b 78 c0 a8 00 01 c0 a8 00 02 00 50 00 00 00 00 00 2a 00 00 00 2a 50 00 27 10 77 44 00 00 48 4f 47 45"])
 done
 sleep 1  # wait for the datapath flow installed
-AT_CHECK_UNQUOTED([cat ovs-vswitchd.log | STRIP_UFID | FILTER_FLOW_INSTALL | STRIP_USED], [0], [dnl
+AT_CHECK_UNQUOTED([cat ovs-vswitchd.log | strip_ufid | FILTER_FLOW_INSTALL | strip_used], [0], [dnl
 recirc_id=0,mpls,in_port=1,vlan_tci=0x0000,dl_src=60:66:66:66:66:00,mpls_label=20,mpls_tc=0,mpls_ttl=32,mpls_bos=0,mpls_lse1=82208, actions:userspace(pid=0,slow_path(controller))
 recirc_id=0,mpls,in_port=1,vlan_tci=0x0000,dl_src=60:66:66:66:66:01,mpls_bos=0,mpls_lse1=82208, actions:userspace(pid=0,slow_path(controller))
 ])
@@ -5918,7 +5918,7 @@ for dl_src in 00 01; do
     AT_CHECK([ovs-appctl netdev-dummy/receive p1 "505400000007 6066666666$dl_src 8847 00014020 00014120 45 00 00 2c 00 00 00 00 40 06 3b 78 c0 a8 00 01 c0 a8 00 02 00 50 00 00 00 00 00 2a 00 00 00 2a 50 00 27 10 77 44 00 00 48 4f 47 45"])
 done
 sleep 1  # wait for the datapath flow installed
-AT_CHECK_UNQUOTED([cat ovs-vswitchd.log | STRIP_UFID | FILTER_FLOW_INSTALL | STRIP_USED], [0], [dnl
+AT_CHECK_UNQUOTED([cat ovs-vswitchd.log | strip_ufid | FILTER_FLOW_INSTALL | strip_used], [0], [dnl
 recirc_id=0,mpls,in_port=1,vlan_tci=0x0000,dl_src=60:66:66:66:66:00,mpls_label=20,mpls_tc=0,mpls_ttl=32,mpls_bos=0,mpls_lse1=82208, actions:userspace(pid=0,slow_path(controller))
 recirc_id=0,mpls,in_port=1,vlan_tci=0x0000,dl_src=60:66:66:66:66:01,mpls_bos=0,mpls_lse1=82208, actions:userspace(pid=0,slow_path(controller))
 ])
@@ -5974,15 +5974,15 @@ dummy@ovs-dummy: hit:13 missed:2
 		pbr1 1/none: (patch: peer=pbr0)
 ])
 
-AT_CHECK([cat ovs-vswitchd.log | STRIP_UFID | FILTER_FLOW_INSTALL | STRIP_USED], [0], [dnl
+AT_CHECK([cat ovs-vswitchd.log | strip_ufid | FILTER_FLOW_INSTALL | strip_used], [0], [dnl
 recirc_id=0,ip,in_port=100,vlan_tci=0x0000,nw_frag=no, actions:101,3,2
 recirc_id=0,ip,in_port=101,vlan_tci=0x0000,nw_frag=no, actions:100,2,3
 ])
 
-AT_CHECK([cat ovs-vswitchd.log | grep -e 'in_port(100).*packets:9' | STRIP_UFID | FILTER_FLOW_DUMP], [0], [dnl
+AT_CHECK([cat ovs-vswitchd.log | grep -e 'in_port(100).*packets:9' | strip_ufid | FILTER_FLOW_DUMP], [0], [dnl
 skb_priority(0/0),skb_mark(0/0),recirc_id(0),dp_hash(0/0),in_port(100),eth(src=50:54:00:00:00:05/00:00:00:00:00:00,dst=50:54:00:00:00:07/00:00:00:00:00:00),eth_type(0x0800),ipv4(src=192.168.0.1/0.0.0.0,dst=192.168.0.2/0.0.0.0,proto=1/0,tos=0/0,ttl=64/0,frag=no),icmp(type=8/0,code=0/0), packets:9, bytes:540, used:0.0s, actions:101,3,2
 ])
-AT_CHECK([cat ovs-vswitchd.log | grep -e 'in_port(101).*packets:4' | STRIP_UFID | FILTER_FLOW_DUMP], [0], [dnl
+AT_CHECK([cat ovs-vswitchd.log | grep -e 'in_port(101).*packets:4' | strip_ufid | FILTER_FLOW_DUMP], [0], [dnl
 skb_priority(0/0),skb_mark(0/0),recirc_id(0),dp_hash(0/0),in_port(101),eth(src=50:54:00:00:00:07/00:00:00:00:00:00,dst=50:54:00:00:00:05/00:00:00:00:00:00),eth_type(0x0800),ipv4(src=192.168.0.2/0.0.0.0,dst=192.168.0.1/0.0.0.0,proto=1/0,tos=0/0,ttl=64/0,frag=no),icmp(type=8/0,code=0/0), packets:4, bytes:240, used:0.0s, actions:100,2,3
 ])
 
@@ -6039,7 +6039,7 @@ dummy@ovs-dummy: hit:0 missed:1
 		pbr1 1/none: (patch: peer=pbr0)
 ])
 
-AT_CHECK([cat ovs-vswitchd.log | STRIP_UFID | FILTER_FLOW_INSTALL | STRIP_USED], [0], [dnl
+AT_CHECK([cat ovs-vswitchd.log | strip_ufid | FILTER_FLOW_INSTALL | strip_used], [0], [dnl
 recirc_id=0,ip,in_port=100,vlan_tci=0x0000,nw_src=192.168.0.1,nw_frag=no, actions:101,set(ipv4(src=255.255.255.254)),2
 ])
 
@@ -6546,7 +6546,7 @@ sleep 1
 dnl The first packet is essentially a no-op, as the new destination MAC is the
 dnl same as the original.  The second entry actually updates the destination
 dnl MAC.
-AT_CHECK([cat ovs-vswitchd.log | STRIP_UFID | FILTER_FLOW_INSTALL | STRIP_USED], [0], [dnl
+AT_CHECK([cat ovs-vswitchd.log | strip_ufid | FILTER_FLOW_INSTALL | strip_used], [0], [dnl
 recirc_id=0,ip,in_port=1,vlan_tci=0x0000,dl_dst=50:54:00:00:00:0a,nw_frag=no, actions:2
 recirc_id=0,ip,in_port=1,vlan_tci=0x0000,dl_dst=50:54:00:00:00:0c,nw_frag=no, actions:set(eth(dst=50:54:00:00:00:0a)),2
 ])
@@ -6575,11 +6575,11 @@ for i in 1 2 3 4; do
     fi
 done
 sleep 1
-AT_CHECK([cat ovs-vswitchd.log | STRIP_UFID | FILTER_FLOW_INSTALL | STRIP_USED], [0], [dnl
+AT_CHECK([cat ovs-vswitchd.log | strip_ufid | FILTER_FLOW_INSTALL | strip_used], [0], [dnl
 pkt_mark=0,recirc_id=0,dp_hash=0,skb_priority=0,ct_state=0,ct_zone=0,ct_mark=0,ct_label=0,icmp,in_port=1,vlan_tci=0x0000,dl_src=50:54:00:00:00:09,dl_dst=50:54:00:00:00:0a,nw_src=10.0.0.2,nw_dst=10.0.0.1,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0, actions:2
 pkt_mark=0,recirc_id=0,dp_hash=0,skb_priority=0,ct_state=0,ct_zone=0,ct_mark=0,ct_label=0,icmp,in_port=1,vlan_tci=0x0000,dl_src=50:54:00:00:00:0b,dl_dst=50:54:00:00:00:0c,nw_src=10.0.0.4,nw_dst=10.0.0.3,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0, actions:drop
 ])
-AT_CHECK([cat ovs-vswitchd.log | STRIP_UFID | FILTER_FLOW_DUMP | grep 'packets:3'], [0], [dnl
+AT_CHECK([cat ovs-vswitchd.log | strip_ufid | FILTER_FLOW_DUMP | grep 'packets:3'], [0], [dnl
 skb_priority(0),skb_mark(0),recirc_id(0),dp_hash(0),in_port(1),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x0800),ipv4(src=10.0.0.2,dst=10.0.0.1,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0), packets:3, bytes:180, used:0.0s, actions:2
 skb_priority(0),skb_mark(0),recirc_id(0),dp_hash(0),in_port(1),eth(src=50:54:00:00:00:0b,dst=50:54:00:00:00:0c),eth_type(0x0800),ipv4(src=10.0.0.4,dst=10.0.0.3,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0), packets:3, bytes:180, used:0.0s, actions:drop
 ])
@@ -7098,7 +7098,7 @@ for i in 1 2 3; do
     ovs-appctl netdev-dummy/receive p1 'in_port(1),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x1234)'
 done
 
-AT_CHECK([ovs-appctl dpif/dump-flows br0 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows br0 | strip_ufid | strip_used | sort], [0], [dnl
 recirc_id(0),in_port(1),eth_type(0x1234), packets:2, bytes:120, used:0.0s, actions:push_vlan(vid=3,pcp=0),100
 ])
 
@@ -7111,11 +7111,11 @@ for i in 1 2 3; do
     ovs-appctl netdev-dummy/receive p1 'in_port(1),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x1234)'
 done
 
-AT_CHECK([ovs-appctl dpif/dump-flows br0 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows br0 | strip_ufid | strip_used | sort], [0], [dnl
 recirc_id(0),in_port(1),eth_type(0x1234), packets:5, bytes:300, used:0.0s, actions:push_vlan(vid=4,pcp=0),100
 ])
 
-AT_CHECK([cat ovs-vswitchd.log | grep 'modify' | STRIP_UFID ], [0], [dnl
+AT_CHECK([cat ovs-vswitchd.log | grep 'modify' | strip_ufid ], [0], [dnl
 dpif|DBG|dummy@ovs-dummy: put[[modify]] skb_priority(0/0),skb_mark(0/0),recirc_id(0),dp_hash(0/0),in_port(1),eth(src=50:54:00:00:00:09/00:00:00:00:00:00,dst=50:54:00:00:00:0a/00:00:00:00:00:00),eth_type(0x1234), actions:push_vlan(vid=4,pcp=0),100
 ])
 OVS_VSWITCHD_STOP
@@ -7139,7 +7139,7 @@ for i in 1 2 3; do
     ovs-appctl netdev-dummy/receive p1 'in_port(1),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x1234)'
 done
 
-AT_CHECK([ovs-appctl dpif/dump-flows br0 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows br0 | strip_ufid | strip_used | sort], [0], [dnl
 recirc_id(0),in_port(1),eth_type(0x1234), packets:2, bytes:120, used:0.0s, actions:100
 ])
 
@@ -7155,7 +7155,7 @@ for i in 1 2 3; do
     ovs-appctl netdev-dummy/receive p1 'in_port(1),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x1234)'
 done
 
-AT_CHECK([ovs-appctl dpif/dump-flows br0 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows br0 | strip_ufid | strip_used | sort], [0], [dnl
 recirc_id(0),in_port(1),eth_type(0x1234), packets:5, bytes:300, used:0.0s, actions:drop
 ])
 
@@ -7170,7 +7170,7 @@ for i in 1 2 3; do
     ovs-appctl netdev-dummy/receive p1 'in_port(1),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x1234)'
 done
 
-AT_CHECK([ovs-appctl dpif/dump-flows br0 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows br0 | strip_ufid | strip_used | sort], [0], [dnl
 recirc_id(0),in_port(1),eth_type(0x1234), packets:8, bytes:480, used:0.0s, actions:100
 ])
 
@@ -7179,14 +7179,14 @@ for i in 1 2 3; do
     ovs-appctl netdev-dummy/receive p1 'in_port(1),eth(src=50:54:00:00:00:09,dst=50:54:00:00:00:0a),eth_type(0x8100),vlan(vid=99,pcp=7),encap(eth_type(0x1234))'
 done
 
-AT_CHECK([ovs-appctl dpif/dump-flows br0 | STRIP_UFID | STRIP_USED | sort], [0], [dnl
+AT_CHECK([ovs-appctl dpif/dump-flows br0 | strip_ufid | strip_used | sort], [0], [dnl
 recirc_id(0),in_port(1),eth_type(0x1234), packets:8, bytes:480, used:0.0s, actions:100
 recirc_id(0),in_port(1),eth_type(0x8100),vlan(vid=99/0x0,pcp=7/0x0),encap(eth_type(0x1234)), packets:2, bytes:120, used:0.0s, actions:drop
 ])
 
 # Check that the new flow matches the CFI bit, while both vid and pcp
 # are wildcarded.
-AT_CHECK([cat ovs-vswitchd.log | grep '\(modify\)\|\(flow_add\)' | STRIP_UFID ], [0], [dnl
+AT_CHECK([cat ovs-vswitchd.log | grep '\(modify\)\|\(flow_add\)' | strip_ufid ], [0], [dnl
 dpif_netdev|DBG|flow_add: recirc_id=0,in_port=1,vlan_tci=0x0000,dl_type=0x1234, actions:100
 dpif|DBG|dummy@ovs-dummy: put[[modify]] skb_priority(0/0),skb_mark(0/0),recirc_id(0),dp_hash(0/0),in_port(1),eth(src=50:54:00:00:00:09/00:00:00:00:00:00,dst=50:54:00:00:00:0a/00:00:00:00:00:00),eth_type(0x1234)
 dpif|DBG|dummy@ovs-dummy: put[[modify]] skb_priority(0/0),skb_mark(0/0),recirc_id(0),dp_hash(0/0),in_port(1),eth(src=50:54:00:00:00:09/00:00:00:00:00:00,dst=50:54:00:00:00:0a/00:00:00:00:00:00),eth_type(0x1234), actions:100
diff --git a/tests/ofproto-macros.at b/tests/ofproto-macros.at
index 7afda4e..4215ee9 100644
--- a/tests/ofproto-macros.at
+++ b/tests/ofproto-macros.at
@@ -235,11 +235,20 @@ ovn_populate_arp() {
 strip_xids () {
     sed 's/ (xid=0x[[0-9a-fA-F]]*)//'
 }
+
+# Changes all 'used:...' to say 'used:0.0', to make output easier to compare.
+strip_used () {
+    sed 's/used:[[0-9]]\.[[0-9]]*/used:0.0/'
+}
+
+# Strips 'ufid:...' from output, to make it easier to compare.
+# (ufids are random.)
+strip_ufid () {
+    sed 's/ufid:[[-0-9a-f]]* //'
+}
 m4_divert_pop([PREPARE_TESTS])
 
 m4_define([STRIP_DURATION], [[sed 's/\bduration=[0-9.]*s/duration=?s/']])
-m4_define([STRIP_USED], [[sed 's/used:[0-9]\.[0-9]*/used:0.0/']])
-m4_define([STRIP_UFID], [[sed 's/ufid:[-0-9a-f]* //']])
 m4_define([TESTABLE_LOG], [-vPATTERN:ANY:'%c|%p|%m'])
 
 # _OVS_VSWITCHD_START([vswitchd-aux-args])
diff --git a/tests/rstp.at b/tests/rstp.at
index ace693d..ba48c0a 100644
--- a/tests/rstp.at
+++ b/tests/rstp.at
@@ -148,13 +148,6 @@ check 2 = F:400000 Di F F F F F F
 AT_CHECK([ovstest test-rstp test-rstp-ieee802.1d-2004-fig17.7], [0], [])
 AT_CLEANUP
 
-# Strips out uninteresting parts of flow output, as well as parts
-# that vary from one run to another (e.g., timing and bond actions).
-m4_define([STRIP_USED], [[sed '
-    s/used:[0-9]*\.[0-9]*/used:0.0/
-    s/duration=[0-9.]*s*/duration=Xs/
-    s/idle_age=[0-9]*,/idle_age=X,/
-']])
 m4_define([FILTER_STP_TOPOLOGY], [[
 grep 'STP state changed' | sed '
     s/.*ofproto_dpif|.*|//
