diff --git a/tools/testrunner/base_runner.py b/tools/testrunner/base_runner.py
index d7b21cfb95..92e0cb2cc3 100644
--- a/tools/testrunner/base_runner.py
+++ b/tools/testrunner/base_runner.py
@@ -2,9 +2,10 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from functools import reduce
-
 from collections import OrderedDict, namedtuple
+from functools import reduce
+from os.path import dirname as up
+
 import json
 import multiprocessing
 import optparse
@@ -13,17 +14,15 @@ import shlex
 import sys
 import traceback
 
-from os.path import dirname as up
-
-from testrunner.local import command
+from testrunner.build_config import BuildConfig
 from testrunner.local import testsuite
 from testrunner.local import utils
+from testrunner.local.context import os_context
 from testrunner.test_config import TestConfig
 from testrunner.testproc import util
 from testrunner.testproc.indicators import PROGRESS_INDICATORS
 from testrunner.testproc.sigproc import SignalProc
 from testrunner.utils.augmented_options import AugmentedOptions
-from testrunner.build_config import BuildConfig
 
 
 DEFAULT_OUT_GN = 'out.gn'
@@ -166,7 +165,7 @@ class BaseTestRunner(object):
 
       args = self._parse_test_args(args)
 
-      with command.os_context(self.target_os, self.options) as ctx:
+      with os_context(self.target_os, self.options) as ctx:
         names = self._args_to_suite_names(args)
         tests = self._load_testsuite_generators(ctx, names)
         self._setup_env()
diff --git a/tools/testrunner/local/command.py b/tools/testrunner/local/command.py
index 976d1b8860..8fead705c9 100644
--- a/tools/testrunner/local/command.py
+++ b/tools/testrunner/local/command.py
@@ -13,8 +13,7 @@ import time
 
 from ..local.android import (Driver, CommandFailedException, TimeoutException)
 from ..objects import output
-from ..local.pool import DefaultExecutionPool, AbortException,\
-  taskkill_windows
+from ..local.pool import AbortException
 
 BASE_DIR = os.path.normpath(
     os.path.join(os.path.dirname(os.path.abspath(__file__)), '..' , '..', '..'))
@@ -208,6 +207,22 @@ class PosixCommand(BaseCommand):
     os.killpg(process.pid, signal.SIGKILL)
 
 
+def taskkill_windows(process, verbose=False, force=True):
+  force_flag = ' /F' if force else ''
+  tk = subprocess.Popen(
+      'taskkill /T%s /PID %d' % (force_flag, process.pid),
+      stdout=subprocess.PIPE,
+      stderr=subprocess.PIPE,
+  )
+  stdout, stderr = tk.communicate()
+  if verbose:
+    print('Taskkill results for %d' % process.pid)
+    print(stdout)
+    print(stderr)
+    print('Return code: %d' % tk.returncode)
+    sys.stdout.flush()
+
+
 class WindowsCommand(BaseCommand):
   def _start_process(self, **kwargs):
     # Try to change the error mode to avoid dialogs on fatal errors. Don't
@@ -312,51 +327,7 @@ class AndroidCommand(BaseCommand):
 Command = None
 
 
-class DefaultOSContext():
-
-  def __init__(self, command, pool=None):
-    self.command = command
-    self.pool = pool or DefaultExecutionPool()
-
-  @contextmanager
-  def context(self, options):
-    yield
-
-
-class AndroidOSContext(DefaultOSContext):
-
-  def __init__(self):
-    super(AndroidOSContext, self).__init__(AndroidCommand)
-
-  @contextmanager
-  def context(self, options):
-    try:
-      AndroidCommand.driver = Driver.instance(options.device)
-      yield
-    finally:
-      AndroidCommand.driver.tear_down()
-
-
-# TODO(liviurau): Add documentation with diagrams to describe how context and
-# its components gets initialized and eventually teared down and how does it
-# interact with both tests and underlying platform specific concerns.
-def find_os_context_factory(target_os):
-  registry = dict(
-      android=AndroidOSContext,
-      windows=lambda: DefaultOSContext(WindowsCommand))
-  default = lambda: DefaultOSContext(PosixCommand)
-  return registry.get(target_os, default)
-
-
-@contextmanager
-def os_context(target_os, options):
-  factory = find_os_context_factory(target_os)
-  context = factory()
-  with context.context(options):
-    yield context
-
-
-# Deprecated : use os_context
+# Deprecated : use context.os_context
 def setup(target_os, device):
   """Set the Command class to the OS-specific version."""
   global Command
@@ -369,7 +340,7 @@ def setup(target_os, device):
     Command = PosixCommand
 
 
-# Deprecated : use os_context
+# Deprecated : use context.os_context
 def tear_down():
   """Clean up after using commands."""
   if Command == AndroidCommand:
diff --git a/tools/testrunner/local/context.py b/tools/testrunner/local/context.py
new file mode 100644
index 0000000000..81a4d1bbe7
--- /dev/null
+++ b/tools/testrunner/local/context.py
@@ -0,0 +1,84 @@
+# Copyright 2022 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from contextlib import contextmanager
+import os
+import signal
+
+import subprocess
+import sys
+
+from ..local.android import Driver
+from .command import AndroidCommand, PosixCommand, WindowsCommand, taskkill_windows
+from .pool import DefaultExecutionPool
+from ..testproc.util import list_processes_linux
+
+
+class DefaultOSContext:
+
+  def __init__(self, command, pool=None):
+    self.command = command
+    self.pool = pool or DefaultExecutionPool(self)
+
+  @contextmanager
+  def handle_context(self, options):
+    yield
+
+  def list_processes(self):
+    return []
+
+  def terminate_process(self, process):
+    pass
+
+
+class LinuxContext(DefaultOSContext):
+
+  def __init__(self):
+    super().__init__(PosixCommand)
+
+  def list_processes(self):
+    return list_processes_linux()
+
+  def terminate_process(self, process):
+    os.kill(process.pid, signal.SIGTERM)
+
+
+class WindowsContext(DefaultOSContext):
+
+  def __init__(self):
+    super().__init__(WindowsCommand)
+
+  def terminate_process(self, process):
+    taskkill_windows(process, verbose=True, force=False)
+
+
+class AndroidOSContext(DefaultOSContext):
+
+  def __init__(self):
+    super().__init__(AndroidCommand)
+
+  @contextmanager
+  def handle_context(self, options):
+    try:
+      AndroidCommand.driver = Driver.instance(options.device)
+      yield
+    finally:
+      AndroidCommand.driver.tear_down()
+
+
+# TODO(liviurau): Add documentation with diagrams to describe how context and
+# its components gets initialized and eventually teared down and how does it
+# interact with both tests and underlying platform specific concerns.
+def find_os_context_factory(target_os):
+  registry = dict(android=AndroidOSContext, windows=WindowsContext)
+  default = LinuxContext
+  return registry.get(target_os, default)
+
+
+@contextmanager
+def os_context(target_os, options):
+  factory = find_os_context_factory(target_os)
+  context_instance = factory()
+  with context_instance.handle_context(options):
+    yield context_instance
diff --git a/tools/testrunner/local/pool.py b/tools/testrunner/local/pool.py
index 34d8d33e39..a6d2b09981 100644
--- a/tools/testrunner/local/pool.py
+++ b/tools/testrunner/local/pool.py
@@ -6,13 +6,12 @@
 import collections
 import os
 import signal
-import subprocess
 import traceback
 
 from contextlib import contextmanager
 from multiprocessing import Process, Queue
 from queue import Empty
-from . import utils
+
 
 
 def setup_testing():
@@ -32,22 +31,6 @@ def setup_testing():
   Process.pid = property(lambda self: None)
 
 
-def taskkill_windows(process, verbose=False, force=True):
-  force_flag = ' /F' if force else ''
-  tk = subprocess.Popen(
-      'taskkill /T%s /PID %d' % (force_flag, process.pid),
-      stdout=subprocess.PIPE,
-      stderr=subprocess.PIPE,
-  )
-  stdout, stderr = tk.communicate()
-  if verbose:
-    print('Taskkill results for %d' % process.pid)
-    print(stdout)
-    print(stderr)
-    print('Return code: %d' % tk.returncode)
-    sys.stdout.flush()
-
-
 class AbortException(Exception):
   """Indicates early abort on SIGINT, SIGTERM or internal hard timeout."""
   pass
@@ -116,7 +99,38 @@ def without_sig():
     signal.signal(signal.SIGTERM, term_handler)
 
 
-class Pool():
+class ContextPool():
+
+  def __init__(self):
+    self.abort_now = False
+
+  def init(self, num_workers, heartbeat_timeout=1, notify_function=None):
+    """
+    Delayed initialization. At context creation time we have no access to the
+    below described parameters.
+    Args:
+      num_workers: Number of worker processes to run in parallel.
+      heartbeat_timeout: Timeout in seconds for waiting for results. Each time
+          the timeout is reached, a heartbeat is signalled and timeout is reset.
+      notify_function: Callable called to signal some events like termination. The
+          event name is passed as string.
+    """
+    pass
+
+  def add_jobs(self, jobs):
+    pass
+
+  def results(self, requirement):
+    pass
+
+  def abort(self):
+    self.abort_now = True
+
+
+ProcessContext = collections.namedtuple('ProcessContext', ['result_reduction'])
+
+
+class DefaultExecutionPool(ContextPool):
   """Distributes tasks to a number of worker processes.
   New tasks can be added dynamically even after the workers have been started.
   Requirement: Tasks can only be added from the parent process, e.g. while
@@ -126,19 +140,11 @@ class Pool():
   # Necessary to not overflow the queue's pipe if a keyboard interrupt happens.
   BUFFER_FACTOR = 4
 
-  def __init__(self, num_workers, heartbeat_timeout=1, notify_fun=None):
-    """
-    Args:
-      num_workers: Number of worker processes to run in parallel.
-      heartbeat_timeout: Timeout in seconds for waiting for results. Each time
-          the timeout is reached, a heartbeat is signalled and timeout is reset.
-      notify_fun: Callable called to signale some events like termination. The
-          event name is passed as string.
-    """
-    self.num_workers = num_workers
+  def __init__(self, os_context=None):
+    super(DefaultExecutionPool, self).__init__()
+    self.os_context = os_context
     self.processes = []
     self.terminated = False
-    self.abort_now = False
 
     # Invariant: processing_count >= #work_queue + #done_queue. It is greater
     # when a worker takes an item from the work_queue and before the result is
@@ -148,8 +154,6 @@ class Pool():
     # allowed to remove items from the done_queue and to add items to the
     # work_queue.
     self.processing_count = 0
-    self.heartbeat_timeout = heartbeat_timeout
-    self.notify = notify_fun or (lambda x: x)
 
     # Disable sigint and sigterm to prevent subprocesses from capturing the
     # signals.
@@ -157,6 +161,30 @@ class Pool():
       self.work_queue = Queue()
       self.done_queue = Queue()
 
+  def init(self, num_workers=1, heartbeat_timeout=1, notify_function=None):
+    """
+    Args:
+      num_workers: Number of worker processes to run in parallel.
+      heartbeat_timeout: Timeout in seconds for waiting for results. Each time
+          the timeout is reached, a heartbeat is signalled and timeout is reset.
+      notify_function: Callable called to signal some events like termination. The
+          event name is passed as string.
+    """
+    self.num_workers = num_workers
+    self.heartbeat_timeout = heartbeat_timeout
+    self.notify = notify_function or (lambda x: x)
+
+  def add_jobs(self, jobs):
+    self.add(jobs)
+
+  def results(self, requirement):
+    return self.imap_unordered(
+        fn=run_job,
+        gen=[],
+        process_context_fn=ProcessContext,
+        process_context_args=[requirement],
+    )
+
   def imap_unordered(self, fn, gen,
                      process_context_fn=None, process_context_args=None):
     """Maps function "fn" to items in generator "gen" on the worker processes
@@ -256,10 +284,7 @@ class Pool():
 
   def _terminate_processes(self):
     for p in self.processes:
-      if utils.IsWindows():
-        taskkill_windows(p, verbose=True, force=False)
-      else:
-        os.kill(p.pid, signal.SIGTERM)
+      self.os_context.terminate_process(p)
 
   def _terminate(self):
     """Terminates execution and cleans up the queues.
@@ -323,30 +348,22 @@ class Pool():
         return MaybeResult.create_heartbeat()
 
 
+class SingleThreadedExecutionPool(ContextPool):
+
+  def __init__(self):
+    super(SingleThreadedExecutionPool, self).__init__()
+    self.work_queue = []
+
+  def add_jobs(self, jobs):
+    self.work_queue.extend(jobs)
+
+  def results(self, requirement):
+    while self.work_queue and not self.abort_now:
+      job = self.work_queue.pop()
+      yield MaybeResult.create_result(job.run(ProcessContext(requirement)))
+
+
 # Global function for multiprocessing, because pickling a static method doesn't
 # work on Windows.
 def run_job(job, process_context):
   return job.run(process_context)
-
-
-ProcessContext = collections.namedtuple('ProcessContext', ['result_reduction'])
-
-
-class DefaultExecutionPool():
-
-  def init(self, jobs, notify_fun):
-    self._pool = Pool(jobs, notify_fun=notify_fun)
-
-  def add_jobs(self, jobs):
-    self._pool.add(jobs)
-
-  def results(self, requirement):
-    return self._pool.imap_unordered(
-        fn=run_job,
-        gen=[],
-        process_context_fn=ProcessContext,
-        process_context_args=[requirement],
-    )
-
-  def abort(self):
-    self._pool.abort()
diff --git a/tools/testrunner/local/pool_test.py b/tools/testrunner/local/pool_test.py
index a5a62638b8..acd597ee6c 100755
--- a/tools/testrunner/local/pool_test.py
+++ b/tools/testrunner/local/pool_test.py
@@ -12,7 +12,7 @@ TOOLS_PATH = os.path.dirname(
     os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 sys.path.append(TOOLS_PATH)
 
-from testrunner.local.pool import Pool
+from testrunner.local.pool import DefaultExecutionPool
 
 
 def Run(x):
@@ -25,7 +25,8 @@ class PoolTest(unittest.TestCase):
 
   def testNormal(self):
     results = set()
-    pool = Pool(3)
+    pool = DefaultExecutionPool()
+    pool.init(3)
     for result in pool.imap_unordered(Run, [[x] for x in range(0, 10)]):
       if result.heartbeat:
         # Any result can be a heartbeat due to timings.
@@ -35,7 +36,8 @@ class PoolTest(unittest.TestCase):
 
   def testException(self):
     results = set()
-    pool = Pool(3)
+    pool = DefaultExecutionPool()
+    pool.init(3)
     with self.assertRaises(Exception):
       for result in pool.imap_unordered(Run, [[x] for x in range(0, 12)]):
         if result.heartbeat:
@@ -49,7 +51,8 @@ class PoolTest(unittest.TestCase):
 
   def testAdd(self):
     results = set()
-    pool = Pool(3)
+    pool = DefaultExecutionPool()
+    pool.init(3)
     for result in pool.imap_unordered(Run, [[x] for x in range(0, 10)]):
       if result.heartbeat:
         # Any result can be a heartbeat due to timings.
diff --git a/tools/testrunner/local/testsuite_test.py b/tools/testrunner/local/testsuite_test.py
index 19db71092c..fa7374218b 100755
--- a/tools/testrunner/local/testsuite_test.py
+++ b/tools/testrunner/local/testsuite_test.py
@@ -12,7 +12,8 @@ TOOLS_PATH = os.path.dirname(
     os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 sys.path.append(TOOLS_PATH)
 
-from testrunner.local.command import DefaultOSContext, PosixCommand
+from testrunner.local.command import PosixCommand
+from testrunner.local.context import DefaultOSContext
 from testrunner.local.testsuite import TestSuite
 from testrunner.test_config import TestConfig
 
diff --git a/tools/testrunner/num_fuzzer.py b/tools/testrunner/num_fuzzer.py
index a92b5cd449..44095d1f4a 100755
--- a/tools/testrunner/num_fuzzer.py
+++ b/tools/testrunner/num_fuzzer.py
@@ -151,7 +151,7 @@ class NumFuzzer(base_runner.BaseTestRunner):
     results = ResultsTracker.create(self.options)
     execproc = ExecutionProc(ctx, self.options.j)
     sigproc = self._create_signal_proc()
-    progress = ProgressProc(self.options, self.framework_name,
+    progress = ProgressProc(ctx, self.options, self.framework_name,
                             tests.test_count_estimate)
     procs = [
         loader,
diff --git a/tools/testrunner/standard_runner.py b/tools/testrunner/standard_runner.py
index d960fbe37c..5350e7eb91 100755
--- a/tools/testrunner/standard_runner.py
+++ b/tools/testrunner/standard_runner.py
@@ -294,7 +294,7 @@ class StandardTestRunner(base_runner.BaseTestRunner):
       outproc_factory = predictable.get_outproc
     execproc = ExecutionProc(ctx, jobs, outproc_factory)
     sigproc = self._create_signal_proc()
-    progress = ProgressProc(self.options, self.framework_name,
+    progress = ProgressProc(ctx, self.options, self.framework_name,
                             tests.test_count_estimate)
     procs = [
         loader,
diff --git a/tools/testrunner/standard_runner_test.py b/tools/testrunner/standard_runner_test.py
index 25e3b5295c..5254b90041 100644
--- a/tools/testrunner/standard_runner_test.py
+++ b/tools/testrunner/standard_runner_test.py
@@ -230,24 +230,27 @@ class StandardRunnerTest(TestRunnerTest):
 
   def testWithFakeContext(self):
     with patch(
-        'testrunner.local.command.find_os_context_factory',
+        'testrunner.local.context.find_os_context_factory',
         return_value=FakeOSContext):
       result = self.run_tests(
           '--progress=verbose',
-          'sweet/cherries',
+          'sweet',
       )
       result.stdout_includes('===>Starting stuff\n'
                              '>>> Running tests for x64.release\n'
                              '>>> Running with test processors\n')
       result.stdout_includes('--- stdout ---\nfake stdout 1')
       result.stdout_includes('--- stderr ---\nfake stderr 1')
+      result.stdout_includes('=== sweet/raspberries ===')
+      result.stdout_includes('=== sweet/cherries ===')
+      result.stdout_includes('=== sweet/apples ===')
       result.stdout_includes('Command: fake_wrapper ')
       result.stdout_includes(
           '===\n'
-          '=== 1 tests failed\n'
+          '=== 4 tests failed\n'
           '===\n'
-          '>>> 7 base tests produced 1 (14%) non-filtered tests\n'
-          '>>> 1 tests ran\n'
+          '>>> 7 base tests produced 7 (100%) non-filtered tests\n'
+          '>>> 7 tests ran\n'
           '<===Stopping stuff\n')
 
   def testSkips(self):
diff --git a/tools/testrunner/testproc/execution.py b/tools/testrunner/testproc/execution.py
index 60c25d310d..3e1cd0bd74 100644
--- a/tools/testrunner/testproc/execution.py
+++ b/tools/testrunner/testproc/execution.py
@@ -31,7 +31,7 @@ class ExecutionProc(base.TestProc):
   def __init__(self, ctx, jobs, outproc_factory=None):
     super(ExecutionProc, self).__init__()
     self.ctx = ctx
-    self.ctx.pool.init(jobs, notify_fun=self.notify_previous)
+    self.ctx.pool.init(jobs, notify_function=self.notify_previous)
     self._outproc_factory = outproc_factory or (lambda t: t.output_proc)
     self._tests = {}
 
diff --git a/tools/testrunner/testproc/indicators.py b/tools/testrunner/testproc/indicators.py
index 7770f21a49..6d192cbdda 100644
--- a/tools/testrunner/testproc/indicators.py
+++ b/tools/testrunner/testproc/indicators.py
@@ -25,10 +25,11 @@ def print_failure_header(test, is_flaky=False):
 
 class ProgressIndicator():
 
-  def __init__(self, options, test_count):
+  def __init__(self, context, options, test_count):
     self.options = None
     self.options = options
     self._total = test_count
+    self.context = context
 
   def on_test_result(self, test, result):
     pass
@@ -45,8 +46,8 @@ class ProgressIndicator():
 
 class SimpleProgressIndicator(ProgressIndicator):
 
-  def __init__(self, options, test_count):
-    super(SimpleProgressIndicator, self).__init__(options, test_count)
+  def __init__(self, context, options, test_count):
+    super(SimpleProgressIndicator, self).__init__(context, options, test_count)
     self._requirement = base.DROP_PASS_OUTPUT
 
     self._failed = []
@@ -96,8 +97,8 @@ class SimpleProgressIndicator(ProgressIndicator):
 
 class StreamProgressIndicator(ProgressIndicator):
 
-  def __init__(self, options, test_count):
-    super(StreamProgressIndicator, self).__init__(options, test_count)
+  def __init__(self, context, options, test_count):
+    super(StreamProgressIndicator, self).__init__(context, options, test_count)
     self._requirement = base.DROP_PASS_OUTPUT
 
   def on_test_result(self, test, result):
@@ -120,8 +121,8 @@ class StreamProgressIndicator(ProgressIndicator):
 
 class VerboseProgressIndicator(SimpleProgressIndicator):
 
-  def __init__(self, options, test_count):
-    super(VerboseProgressIndicator, self).__init__(options, test_count)
+  def __init__(self, context, options, test_count):
+    super(VerboseProgressIndicator, self).__init__(context, options, test_count)
     self._last_printed_time = time.time()
 
   def _print(self, text):
@@ -139,10 +140,11 @@ class VerboseProgressIndicator(SimpleProgressIndicator):
 
   # TODO(machenbach): Remove this platform specific hack and implement a proper
   # feedback channel from the workers, providing which tests are currently run.
-  def _print_processes_linux(self):
-    if platform.system() == 'Linux':
+  def _print_processes(self):
+    procs = self.context.list_processes()
+    if procs:
       self._print('List of processes:')
-      for pid, cmd in util.list_processes_linux():
+      for pid, cmd in self.context.list_processes():
         # Show command with pid, but other process info cut off.
         self._print('pid: %d cmd: %s' % (pid, cmd))
 
@@ -154,17 +156,17 @@ class VerboseProgressIndicator(SimpleProgressIndicator):
       # Print something every 30 seconds to not get killed by an output
       # timeout.
       self._print('Still working...')
-      self._print_processes_linux()
+      self._print_processes()
 
   def on_event(self, event):
     self._print(event)
-    self._print_processes_linux()
+    self._print_processes()
 
 
 class CIProgressIndicator(VerboseProgressIndicator):
 
-  def on_test_result(self, test, result):
-    super(VerboseProgressIndicator, self).on_test_result(test, result)
+  def on_test_result(self, context, test, result):
+    super(VerboseProgressIndicator, self).on_test_result(context, test, result)
     if self.options.ci_test_completion:
       with open(self.options.ci_test_completion, "a") as f:
         f.write(self._message(test, result) + "\n")
@@ -182,8 +184,8 @@ class CIProgressIndicator(VerboseProgressIndicator):
 
 class DotsProgressIndicator(SimpleProgressIndicator):
 
-  def __init__(self, options, test_count):
-    super(DotsProgressIndicator, self).__init__(options, test_count)
+  def __init__(self, context, options, test_count):
+    super(DotsProgressIndicator, self).__init__(context, options, test_count)
     self._count = 0
 
   def on_test_result(self, test, result):
@@ -209,8 +211,8 @@ class DotsProgressIndicator(SimpleProgressIndicator):
 
 class CompactProgressIndicator(ProgressIndicator):
 
-  def __init__(self, options, test_count, templates):
-    super(CompactProgressIndicator, self).__init__(options, test_count)
+  def __init__(self, context, options, test_count, templates):
+    super(CompactProgressIndicator, self).__init__(context, options, test_count)
     self._requirement = base.DROP_PASS_OUTPUT
 
     self._templates = templates
@@ -293,7 +295,7 @@ class CompactProgressIndicator(ProgressIndicator):
 
 class ColorProgressIndicator(CompactProgressIndicator):
 
-  def __init__(self, options, test_count):
+  def __init__(self, context, options, test_count):
     templates = {
         'status_line': ("[%(mins)02i:%(secs)02i|"
                         "\033[34m%%%(progress) 4d\033[0m|"
@@ -304,7 +306,8 @@ class ColorProgressIndicator(CompactProgressIndicator):
         'failure': "\033[1;31m%s\033[0m",
         'command': "\033[33m%s\033[0m",
     }
-    super(ColorProgressIndicator, self).__init__(options, test_count, templates)
+    super(ColorProgressIndicator, self).__init__(context, options, test_count,
+                                                 templates)
 
   def printFormatted(self, format, string):
     print(self._templates[format] % string)
@@ -320,13 +323,13 @@ class ColorProgressIndicator(CompactProgressIndicator):
 
 class MonochromeProgressIndicator(CompactProgressIndicator):
 
-  def __init__(self, options, test_count):
+  def __init__(self, context, options, test_count):
     templates = {
         'status_line': ("[%(mins)02i:%(secs)02i|%%%(progress) 4d|"
                         "+%(passed) 4d|-%(failed) 4d]: %(test)s"),
     }
-    super(MonochromeProgressIndicator, self).__init__(options, test_count,
-                                                      templates)
+    super(MonochromeProgressIndicator, self).__init__(context, options,
+                                                      test_count, templates)
 
   def printFormatted(self, format, string):
     print(string)
@@ -337,8 +340,9 @@ class MonochromeProgressIndicator(CompactProgressIndicator):
 
 class JsonTestProgressIndicator(ProgressIndicator):
 
-  def __init__(self, options, test_count, framework_name):
-    super(JsonTestProgressIndicator, self).__init__(options, test_count)
+  def __init__(self, context, options, test_count, framework_name):
+    super(JsonTestProgressIndicator, self).__init__(context, options,
+                                                    test_count)
     self.tests = util.FixedSizeTopList(
         self.options.slow_tests_cutoff, key=lambda rec: rec['duration'])
     # We want to drop stdout/err for all passed tests on the first try, but we
diff --git a/tools/testrunner/testproc/progress.py b/tools/testrunner/testproc/progress.py
index b5cb07b7a7..789adf053f 100644
--- a/tools/testrunner/testproc/progress.py
+++ b/tools/testrunner/testproc/progress.py
@@ -56,12 +56,16 @@ class ResultsTracker(base.TestProcObserver):
 
 class ProgressProc(base.TestProcObserver):
 
-  def __init__(self, options, framework_name, test_count):
+  def __init__(self, context, options, framework_name, test_count):
     super(ProgressProc, self).__init__()
-    self.procs = [PROGRESS_INDICATORS[options.progress](options, test_count)]
+    self.procs = [
+        PROGRESS_INDICATORS[options.progress](context, options, test_count)
+    ]
     if options.json_test_results:
       self.procs.insert(
-          0, JsonTestProgressIndicator(options, test_count, framework_name))
+          0,
+          JsonTestProgressIndicator(context, options, test_count,
+                                    framework_name))
 
     self._requirement = max(proc._requirement for proc in self.procs)
 
diff --git a/tools/testrunner/utils/test_utils.py b/tools/testrunner/utils/test_utils.py
index d509061c7c..4891d07266 100644
--- a/tools/testrunner/utils/test_utils.py
+++ b/tools/testrunner/utils/test_utils.py
@@ -16,8 +16,10 @@ from dataclasses import dataclass
 from io import StringIO
 from os.path import dirname as up
 
-from testrunner.local.command import BaseCommand, DefaultOSContext
+from testrunner.local.command import BaseCommand
 from testrunner.objects import output
+from testrunner.local.context import DefaultOSContext
+from testrunner.local.pool import SingleThreadedExecutionPool
 
 TOOLS_ROOT = up(up(up(os.path.abspath(__file__))))
 sys.path.append(TOOLS_ROOT)
@@ -189,10 +191,11 @@ class TestRunnerTest(unittest.TestCase):
 class FakeOSContext(DefaultOSContext):
 
   def __init__(self):
-    super(FakeOSContext, self).__init__(FakeCommand)
+    super(FakeOSContext, self).__init__(FakeCommand,
+                                        SingleThreadedExecutionPool())
 
   @contextmanager
-  def context(self, device):
+  def handle_context(self, options):
     print("===>Starting stuff")
     yield
     print("<===Stopping stuff")