diff --git a/.gitignore b/.gitignore
index 83214be..807dc3c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,6 @@ __pycache__/
 /download/
 /gruut/
 *.onnx
-.dockerignore
\ No newline at end of file
+.dockerignore
+.coverage
+coverage.xml
diff --git a/espeak_phonemizer/VERSION b/espeak_phonemizer/VERSION
index afaf360..7dea76e 100644
--- a/espeak_phonemizer/VERSION
+++ b/espeak_phonemizer/VERSION
@@ -1 +1 @@
-1.0.0
\ No newline at end of file
+1.0.1
diff --git a/espeak_phonemizer/__init__.py b/espeak_phonemizer/__init__.py
index 299aaf6..a09472e 100644
--- a/espeak_phonemizer/__init__.py
+++ b/espeak_phonemizer/__init__.py
@@ -103,18 +103,16 @@ class Phonemizer:
 
             self.lib_espeak.espeak_SetPhonemeTrace(phoneme_flags, phonemes_file)
 
-            identifier = ctypes.c_uint()
-            user_data = ctypes.c_void_p()
             text_bytes = text.encode("utf-8")
             self.lib_espeak.espeak_Synth(
                 text_bytes,
-                0,  # buflength
+                0,  # buflength (unused in AUDIO_OUTPUT_SYNCHRONOUS mode)
                 0,  # position
                 0,  # position_type
-                0,  # end_position
+                0,  # end_position (no end position)
                 Phonemizer.espeakCHARS_AUTO | Phonemizer.espeakPHONEMES,
-                identifier,
-                user_data,
+                None,  # unique_speaker,
+                None,  # user_data,
             )
             self.libc.fflush(phonemes_file)
 
@@ -162,7 +160,7 @@ class Phonemizer:
 
     def _maybe_init(self):
         if self.libc and self.lib_espeak:
-            # Already initialize
+            # Already initialized
             return
 
         self.libc = ctypes.cdll.LoadLibrary("libc.so.6")
diff --git a/requirements_dev.txt b/requirements_dev.txt
index ab6cb3e..e2c0e77 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,7 +1,7 @@
 black==19.10b0
 coverage==5.0.4
 flake8==3.7.9
-mypy==0.770
-pylint==2.4.4
+mypy==0.910
+pylint==2.10.2
 pytest==5.4.1
 pytest-cov==2.8.1
diff --git a/scripts/run-tests.sh b/scripts/run-tests.sh
new file mode 100755
index 0000000..c38920d
--- /dev/null
+++ b/scripts/run-tests.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -e pipefail
+
+# Directory of *this* script
+this_dir="$( cd "$( dirname "$0" )" && pwd )"
+src_dir="$(realpath "${this_dir}/..")"
+
+if [[ "$1" == '--no-venv' ]]; then
+    no_venv='1'
+fi
+
+if [[ -z "${no_venv}" ]]; then
+    venv="${src_dir}/.venv"
+    if [[ -d "${venv}" ]]; then
+        source "${venv}/bin/activate"
+    fi
+fi
+
+# -----------------------------------------------------------------------------
+
+export PYTHONPATH="${src_dir}"
+
+coverage run "--source=${src_dir}/espeak_phonemizer" -m pytest
+coverage report -m
+coverage xml
+
+# -----------------------------------------------------------------------------
+
+echo "OK"