diff --git a/scripts/exec_wrapper.py b/scripts/exec_wrapper.py
index c0d5eee0..3e85e538 100755
--- a/scripts/exec_wrapper.py
+++ b/scripts/exec_wrapper.py
@@ -50,7 +50,7 @@ def exec_wrapper_write_traceback():
 	open('my.err','w').write(''.join(lines+[exc]))
 
 def exec_wrapper_end_msg():
-	if os.getenv('EXEC_WRAPPER_SPAWN'):
+	if os.getenv('EXEC_WRAPPER_SPAWN') and not os.getenv('MMGEN_TEST_SUITE_DETERMINISTIC'):
 		c = exec_wrapper_get_colors()
 		# write to stdout to ensure script output gets to terminal first
 		sys.stdout.write(c.blue('Runtime: {:0.5f} secs\n'.format(time.time() - exec_wrapper_tstart)))
diff --git a/test/gentest.py b/test/gentest.py
index 25d8e0ca..b00df354 100755
--- a/test/gentest.py
+++ b/test/gentest.py
@@ -333,7 +333,8 @@ def speed_test(kg,ag,rounds):
 		vmsg(f'\nkey:  {sec.wif}\naddr: {addr}\n')
 	qmsg(
 		f'\rRound {i+1}/{rounds} ' +
-		f'\n{rounds} addresses generated in {time.time()-start:.2f} seconds'
+		f'\n{rounds} addresses generated' +
+		('' if g.test_suite_deterministic else ' in {time.time()-start:.2f} seconds')
 	)
 
 def dump_test(kg,ag,fh):
diff --git a/test/include/common.py b/test/include/common.py
index 6f479dcc..f8e5b1de 100755
--- a/test/include/common.py
+++ b/test/include/common.py
@@ -67,7 +67,11 @@ ref_kafile_pass = 'kafile password'
 ref_kafile_hash_preset = '1'
 
 def getrand(n):
-	return os.urandom(n)
+	if g.test_suite_deterministic:
+		from mmgen.crypto import fake_urandom
+		return fake_urandom(n)
+	else:
+		return os.urandom(n)
 
 def getrandnum(n):
 	return int(getrand(n).hex(),16)
diff --git a/test/objtest.py b/test/objtest.py
index ac90159e..68fb49c3 100755
--- a/test/objtest.py
+++ b/test/objtest.py
@@ -97,6 +97,8 @@ def run_test(test,arg,input_data,arg1,exc_name):
 	try:
 		if not opt.super_silent:
 			arg_disp = repr(arg_copy[0] if type(arg_copy) == tuple else arg_copy)
+			if g.test_suite_deterministic and isinstance(arg_copy,dict):
+				arg_disp = re.sub(r'object at 0x[0-9a-f]+','object at [SCRUBBED]',arg_disp)
 			msg_r((green if input_data=='good' else orange)(f'{arg_disp+":":<22}'))
 		cls = globals()[test]
 
diff --git a/test/overlay/fakemods/crypto.py b/test/overlay/fakemods/crypto.py
new file mode 100644
index 00000000..9e042351
--- /dev/null
+++ b/test/overlay/fakemods/crypto.py
@@ -0,0 +1,21 @@
+from .crypto_orig import *
+
+if os.getenv('MMGEN_TEST_SUITE_DETERMINISTIC'):
+	get_random_orig = get_random
+	add_user_random_orig = add_user_random
+
+	fake_rand_h = sha256('.'.join(sys.argv).encode())
+	def fake_urandom(n):
+
+		def gen(rounds):
+			for i in range(rounds):
+				fake_rand_h.update(b'foo')
+				yield fake_rand_h.digest()
+
+		return b''.join(gen(int(n/32)+1))[:n]
+
+	def get_random(length):
+		return fake_urandom(len(get_random_orig(length)))
+
+	def add_user_random(rand_bytes,desc):
+		return fake_urandom(len(add_user_random_orig(rand_bytes,desc)))
diff --git a/test/overlay/fakemods/tw.py b/test/overlay/fakemods/tw.py
index 8b48dfac..ed3848c1 100644
--- a/test/overlay/fakemods/tw.py
+++ b/test/overlay/fakemods/tw.py
@@ -1,5 +1,21 @@
 from .tw_orig import *
 
+if os.getenv('MMGEN_TEST_SUITE_DETERMINISTIC'):
+	def _time_gen():
+		""" add a minute to each successive time value """
+		for i in range(1000000):
+			yield 1321009871 + (i*60)
+
+	_time_iter = _time_gen()
+
+	TwUnspentOutputs.date_formatter = {
+		'days':      lambda rpc,secs: (next(_time_iter) - secs) // 86400,
+		'date':      lambda rpc,secs: '{}-{:02}-{:02}'.format(*time.gmtime(next(_time_iter))[:3])[2:],
+		'date_time': lambda rpc,secs: '{}-{:02}-{:02} {:02}:{:02}'.format(*time.gmtime(next(_time_iter))[:5]),
+	}
+
+	TwAddrList.date_formatter = TwUnspentOutputs.date_formatter
+
 if os.getenv('MMGEN_BOGUS_WALLET_DATA'):
 	# 1831006505 (09 Jan 2028) = projected time of block 1000000
 	TwUnspentOutputs.date_formatter['days'] = lambda rpc,secs: (1831006505 - secs) // 86400
diff --git a/test/overlay/fakemods/util.py b/test/overlay/fakemods/util.py
new file mode 100644
index 00000000..f3aa8248
--- /dev/null
+++ b/test/overlay/fakemods/util.py
@@ -0,0 +1,11 @@
+from .util_orig import *
+
+if os.getenv('MMGEN_TEST_SUITE_DETERMINISTIC'):
+	make_timestamp_orig = make_timestamp
+	make_timestr_orig = make_timestr
+
+	def make_timestamp(secs=None):
+		return make_timestamp_orig(1321009871)
+
+	def make_timestr(secs=None):
+		return make_timestr_orig(1321009871)
diff --git a/test/test-release.sh b/test/test-release.sh
index 7f059027..901f9e06 100755
--- a/test/test-release.sh
+++ b/test/test-release.sh
@@ -40,7 +40,7 @@ quick_tests='dep misc obj color unit hash ref altref alts xmr eth autosign btc b
 qskip_tests='btc_tn bch bch_rt ltc ltc_rt'
 
 PROGNAME=$(basename $0)
-while getopts hAbCfFi:I:lNOps:tvV OPT
+while getopts hAbCDfFi:I:lNOps:tvV OPT
 do
 	case "$OPT" in
 	h)  printf "  %-16s Test MMGen release\n" "${PROGNAME}:"
@@ -49,6 +49,7 @@ do
 		echo   "           -A      Skip tests requiring altcoin modules or daemons"
 		echo   "           -b      Buffer keypresses for all invocations of 'test/test.py'"
 		echo   "           -C      Run tests in coverage mode"
+		echo   "           -D      Run tests in deterministic mode"
 		echo   "           -f      Speed up the tests by using fewer rounds"
 		echo   "           -F      Reduce rounds even further"
 		echo   "           -i BRANCH Create and install Python package from cloned BRANCH, then"
@@ -114,6 +115,8 @@ do
 		gentest_py="$python $gentest_py"
 		mmgen_tool="$python $mmgen_tool"
 		mmgen_keygen="$python $mmgen_keygen" ;&
+	D)  export MMGEN_TEST_SUITE_DETERMINISTIC=1
+		export MMGEN_DISABLE_COLOR=1 ;;
 	f)  FAST=1 rounds=10 rounds_min=3 rounds_mid=25 rounds_max=50 unit_tests_py+=" --fast" ;;
 	F)  FAST=1 rounds=3 rounds_min=1 rounds_mid=3 rounds_max=5 unit_tests_py+=" --fast" ;;
 	i)  INSTALL=$OPTARG ;;
@@ -595,5 +598,9 @@ elapsed=$(($(date +%s)-start_time))
 elapsed_fmt=$(printf %02d:%02d $((elapsed/60)) $((elapsed%60)))
 
 [ "$LIST_CMDS" ] || {
-	echo -e "${GREEN}All OK.  Total elapsed time: $elapsed_fmt$RESET"
+	if [ "$MMGEN_TEST_SUITE_DETERMINISTIC" ]; then
+		echo -e "${GREEN}All OK"
+	else
+		echo -e "${GREEN}All OK.  Total elapsed time: $elapsed_fmt$RESET"
+	fi
 }
diff --git a/test/test.py b/test/test.py
index 14bc817c..ca1bb114 100755
--- a/test/test.py
+++ b/test/test.py
@@ -168,7 +168,7 @@ def add_cmdline_opts():
 
 # add_cmdline_opts()
 
-opts.UserOpts._reset_ok += ('skip_deps','no_daemon_autostart')
+opts.UserOpts._reset_ok += ('skip_deps','no_daemon_autostart','names','no_timings')
 
 # step 2: opts.init will create new data_dir in ./test (if not 'resume' or 'skip_deps'):
 usr_args = opts.init(opts_data)
@@ -186,6 +186,11 @@ if not (opt.resume or opt.skip_deps):
 
 check_segwit_opts()
 
+if g.test_suite_deterministic:
+	opt.no_timings = True
+	init_color(num_colors=0)
+	os.environ['MMGEN_DISABLE_COLOR'] = '1'
+
 if opt.profile:
 	opt.names = True
 
diff --git a/test/unit_tests_d/ut_scrypt.py b/test/unit_tests_d/ut_scrypt.py
index fbb5f0b0..171f5b29 100755
--- a/test/unit_tests_d/ut_scrypt.py
+++ b/test/unit_tests_d/ut_scrypt.py
@@ -52,7 +52,7 @@ class unit_test(object):
 				st = time.time()
 				ret = scrypt_hash_passphrase(pw,salt,hp).hex()
 				t = time.time() - st
-				vmsg(f'  {t:0.4f} secs')
+				vmsg('' if g.test_suite_deterministic else f'  {t:0.4f} secs')
 				assert ret == res, ret
 
 		if opt.quiet: