diff --git a/poetry.lock b/poetry.lock
index 877d805..7e9029d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -6,6 +6,28 @@ optional = false
 python-versions = "*"
 version = "1.4.4"
 
+[[package]]
+category = "dev"
+description = "Atomic file writes."
+marker = "sys_platform == \"win32\""
+name = "atomicwrites"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.4.0"
+
+[[package]]
+category = "dev"
+description = "Classes Without Boilerplate"
+name = "attrs"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "20.1.0"
+
+[package.extras]
+dev = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "sphinx-rtd-theme", "pre-commit"]
+docs = ["sphinx", "sphinx-rtd-theme", "zope.interface"]
+tests = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+
 [[package]]
 category = "dev"
 description = "The uncompromising code formatter."
@@ -52,6 +74,15 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "7.1.2"
 
+[[package]]
+category = "dev"
+description = "Cross-platform colored terminal text."
+marker = "sys_platform == \"win32\""
+name = "colorama"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.4.3"
+
 [[package]]
 category = "main"
 description = "Composable style cycles"
@@ -71,6 +102,14 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.10"
 
+[[package]]
+category = "dev"
+description = "iniconfig: brain-dead simple config-ini parsing"
+name = "iniconfig"
+optional = false
+python-versions = "*"
+version = "1.0.1"
+
 [[package]]
 category = "main"
 description = "A fast implementation of the Cassowary constraint solver"
@@ -94,6 +133,14 @@ numpy = ">=1.11"
 pyparsing = ">=2.0.1,<2.0.4 || >2.0.4,<2.1.2 || >2.1.2,<2.1.6 || >2.1.6"
 python-dateutil = ">=2.1"
 
+[[package]]
+category = "dev"
+description = "More routines for operating on iterables, beyond itertools"
+name = "more-itertools"
+optional = false
+python-versions = ">=3.5"
+version = "8.5.0"
+
 [[package]]
 category = "dev"
 description = "Optional static typing for Python"
@@ -137,6 +184,18 @@ optional = false
 python-versions = ">=3.5"
 version = "1.17.2"
 
+[[package]]
+category = "dev"
+description = "Core utilities for Python packages"
+name = "packaging"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "20.4"
+
+[package.dependencies]
+pyparsing = ">=2.0.2"
+six = "*"
+
 [[package]]
 category = "dev"
 description = "Utility library for gitignore style pattern matching of file paths."
@@ -145,6 +204,17 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "0.8.0"
 
+[[package]]
+category = "dev"
+description = "plugin and hook calling mechanisms for python"
+name = "pluggy"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "0.13.1"
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+
 [[package]]
 category = "main"
 description = "Protocol Buffers"
@@ -165,6 +235,14 @@ optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 version = "2.8.3"
 
+[[package]]
+category = "dev"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+name = "py"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.9.0"
+
 [[package]]
 category = "main"
 description = "ALSA bindings"
@@ -219,6 +297,29 @@ optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 version = "2.4.7"
 
+[[package]]
+category = "dev"
+description = "pytest: simple powerful testing with Python"
+name = "pytest"
+optional = false
+python-versions = ">=3.5"
+version = "6.0.1"
+
+[package.dependencies]
+atomicwrites = ">=1.0"
+attrs = ">=17.4.0"
+colorama = "*"
+iniconfig = "*"
+more-itertools = ">=4.0.0"
+packaging = "*"
+pluggy = ">=0.12,<1.0"
+py = ">=1.8.2"
+toml = "*"
+
+[package.extras]
+checkqa_mypy = ["mypy (0.780)"]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
+
 [[package]]
 category = "main"
 description = "Extensions to the standard Python datetime module"
@@ -313,7 +414,7 @@ secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "pyOpenSSL (>=0
 socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
 
 [metadata]
-content-hash = "284dea422084579d1f99320aaa7c816165b0d7e2aca709c84a0036dee4255a4d"
+content-hash = "7145f097b34f0bbe62825427b4ecc8c916fa48c8255a9b5da539edf6b990540f"
 lock-version = "1.0"
 python-versions = "^3.8"
 
@@ -322,6 +423,14 @@ appdirs = [
     {file = "appdirs-1.4.4-py2.py3-none-any.whl", hash = "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"},
     {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
 ]
+atomicwrites = [
+    {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},
+    {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},
+]
+attrs = [
+    {file = "attrs-20.1.0-py2.py3-none-any.whl", hash = "sha256:2867b7b9f8326499ab5b0e2d12801fa5c98842d2cbd22b35112ae04bf85b4dff"},
+    {file = "attrs-20.1.0.tar.gz", hash = "sha256:0ef97238856430dcf9228e07f316aefc17e8939fc8507e18c6501b761ef1a42a"},
+]
 black = [
     {file = "black-20.8b1-py3-none-any.whl", hash = "sha256:70b62ef1527c950db59062cda342ea224d772abdf6adc58b86a45421bab20a6b"},
     {file = "black-20.8b1.tar.gz", hash = "sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea"},
@@ -338,6 +447,10 @@ click = [
     {file = "click-7.1.2-py2.py3-none-any.whl", hash = "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"},
     {file = "click-7.1.2.tar.gz", hash = "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a"},
 ]
+colorama = [
+    {file = "colorama-0.4.3-py2.py3-none-any.whl", hash = "sha256:7d73d2a99753107a36ac6b455ee49046802e59d9d076ef8e47b61499fa29afff"},
+    {file = "colorama-0.4.3.tar.gz", hash = "sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1"},
+]
 cycler = [
     {file = "cycler-0.10.0-py2.py3-none-any.whl", hash = "sha256:1d8a5ae1ff6c5cf9b93e8811e581232ad8920aeec647c37316ceac982b08cb2d"},
     {file = "cycler-0.10.0.tar.gz", hash = "sha256:cd7b2d1018258d7247a71425e9f26463dfb444d411c39569972f4ce586b0c9d8"},
@@ -346,6 +459,10 @@ idna = [
     {file = "idna-2.10-py2.py3-none-any.whl", hash = "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"},
     {file = "idna-2.10.tar.gz", hash = "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6"},
 ]
+iniconfig = [
+    {file = "iniconfig-1.0.1-py3-none-any.whl", hash = "sha256:80cf40c597eb564e86346103f609d74efce0f6b4d4f30ec8ce9e2c26411ba437"},
+    {file = "iniconfig-1.0.1.tar.gz", hash = "sha256:e5f92f89355a67de0595932a6c6c02ab4afddc6fcdc0bfc5becd0d60884d3f69"},
+]
 kiwisolver = [
     {file = "kiwisolver-1.2.0-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:443c2320520eda0a5b930b2725b26f6175ca4453c61f739fef7a5847bd262f74"},
     {file = "kiwisolver-1.2.0-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:efcf3397ae1e3c3a4a0a0636542bcad5adad3b1dd3e8e629d0b6e201347176c8"},
@@ -378,6 +495,10 @@ matplotlib = [
     {file = "matplotlib-3.1.1-cp37-cp37m-win_amd64.whl", hash = "sha256:4442ce720907f67a79d45de9ada47be81ce17e6c2f448b3c64765af93f6829c9"},
     {file = "matplotlib-3.1.1.tar.gz", hash = "sha256:1febd22afe1489b13c6749ea059d392c03261b2950d1d45c17e3aed812080c93"},
 ]
+more-itertools = [
+    {file = "more-itertools-8.5.0.tar.gz", hash = "sha256:6f83822ae94818eae2612063a5101a7311e68ae8002005b5e05f03fd74a86a20"},
+    {file = "more_itertools-8.5.0-py3-none-any.whl", hash = "sha256:9b30f12df9393f0d28af9210ff8efe48d10c94f73e5daf886f10c4b0b0b4f03c"},
+]
 mypy = [
     {file = "mypy-0.782-cp35-cp35m-macosx_10_6_x86_64.whl", hash = "sha256:2c6cde8aa3426c1682d35190b59b71f661237d74b053822ea3d748e2c9578a7c"},
     {file = "mypy-0.782-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:9c7a9a7ceb2871ba4bac1cf7217a7dd9ccd44c27c2950edbc6dc08530f32ad4e"},
@@ -437,10 +558,18 @@ numpy = [
     {file = "numpy-1.17.2-cp37-cp37m-win_amd64.whl", hash = "sha256:5fd214f482ab53f2cea57414c5fb3e58895b17df6e6f5bca5be6a0bb6aea23bb"},
     {file = "numpy-1.17.2.zip", hash = "sha256:73615d3edc84dd7c4aeb212fa3748fb83217e00d201875a47327f55363cef2df"},
 ]
+packaging = [
+    {file = "packaging-20.4-py2.py3-none-any.whl", hash = "sha256:998416ba6962ae7fbd6596850b80e17859a5753ba17c32284f67bfff33784181"},
+    {file = "packaging-20.4.tar.gz", hash = "sha256:4357f74f47b9c12db93624a82154e9b120fa8293699949152b22065d556079f8"},
+]
 pathspec = [
     {file = "pathspec-0.8.0-py2.py3-none-any.whl", hash = "sha256:7d91249d21749788d07a2d0f94147accd8f845507400749ea19c1ec9054a12b0"},
     {file = "pathspec-0.8.0.tar.gz", hash = "sha256:da45173eb3a6f2a5a487efba21f050af2b41948be6ab52b6a1e3ff22bb8b7061"},
 ]
+pluggy = [
+    {file = "pluggy-0.13.1-py2.py3-none-any.whl", hash = "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"},
+    {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
+]
 protobuf = [
     {file = "protobuf-3.13.0-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:9c2e63c1743cba12737169c447374fab3dfeb18111a460a8c1a000e35836b18c"},
     {file = "protobuf-3.13.0-cp27-cp27mu-manylinux1_x86_64.whl", hash = "sha256:1e834076dfef9e585815757a2c7e4560c7ccc5962b9d09f831214c693a91b463"},
@@ -474,6 +603,10 @@ psycopg2 = [
     {file = "psycopg2-2.8.3-cp37-cp37m-win_amd64.whl", hash = "sha256:cb407fccc12fc29dc331f2b934913405fa49b9b75af4f3a72d0f50f57ad2ca23"},
     {file = "psycopg2-2.8.3.tar.gz", hash = "sha256:897a6e838319b4bf648a574afb6cabcb17d0488f8c7195100d48d872419f4457"},
 ]
+py = [
+    {file = "py-1.9.0-py2.py3-none-any.whl", hash = "sha256:366389d1db726cd2fcfc79732e75410e5fe4d31db13692115529d34069a043c2"},
+    {file = "py-1.9.0.tar.gz", hash = "sha256:9ca6883ce56b4e8da7e79ac18787889fa5206c79dcc67fb065376cd2fe03f342"},
+]
 pyalsaaudio = [
     {file = "pyalsaaudio-0.9.0.tar.gz", hash = "sha256:3ca069c736c8ad2a3047b5033468d983a2480f94fad4feb0169c056060e01e69"},
 ]
@@ -497,6 +630,10 @@ pyparsing = [
     {file = "pyparsing-2.4.7-py2.py3-none-any.whl", hash = "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"},
     {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
 ]
+pytest = [
+    {file = "pytest-6.0.1-py3-none-any.whl", hash = "sha256:8b6007800c53fdacd5a5c192203f4e531eb2a1540ad9c752e052ec0f7143dbad"},
+    {file = "pytest-6.0.1.tar.gz", hash = "sha256:85228d75db9f45e06e57ef9bf4429267f81ac7c0d742cc9ed63d09886a9fe6f4"},
+]
 python-dateutil = [
     {file = "python-dateutil-2.8.1.tar.gz", hash = "sha256:73ebfe9dbf22e832286dafa60473e4cd239f8592f699aa5adaf10050e6e1823c"},
     {file = "python_dateutil-2.8.1-py2.py3-none-any.whl", hash = "sha256:75bb3f31ea686f1197762692a9ee6a7550b59fc6ca3a1f4b5d7e32fb98e2da2a"},
diff --git a/pyproject.toml b/pyproject.toml
index 4ba763d..e80b002 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ requests = "^2.24.0"
 [tool.poetry.dev-dependencies]
 black = "^20.8b1"
 mypy = "^0.782"
+pytest = "^6.0.1"
 
 [tool.poetry.scripts]
 turntable = "turntable.cli:main"
diff --git a/tests/test_turntable.py b/tests/test_turntable.py
new file mode 100644
index 0000000..ea7296a
--- /dev/null
+++ b/tests/test_turntable.py
@@ -0,0 +1,35 @@
+from itertools import chain
+import struct
+from typing import List
+import unittest
+
+from turntable.models import PCM
+from turntable.turntable import PCMRecognizer
+
+
+class TestPCMRecognizer(unittest.TestCase):
+    def channel_data_to_pcm(self, channels: List[List[int]]) -> PCM:
+        def interleave(xs: List[List[int]]) -> List[int]:
+            return list(chain(*zip(*xs)))
+
+        interleaved = interleave(channels)
+        raw = struct.pack("{}h".format(len(interleaved)), *interleaved)
+        return PCM(framerate=48000, channels=len(channels), data=raw)
+
+    def test_convert_monaural_audio(self):
+        channels = [[1] * 10]
+        pcm = self.channel_data_to_pcm(channels)
+        converted = PCMRecognizer.pcm_to_channel_data(pcm)
+        self.assertEqual(channels, converted)
+
+    def test_convert_stereo_audio(self):
+        channels = [[1] * 10, [2] * 10]
+        pcm = self.channel_data_to_pcm(channels)
+        converted = PCMRecognizer.pcm_to_channel_data(pcm)
+        self.assertEqual(channels, converted)
+
+    def test_convert_10_channel_audio(self):
+        channels = [[i] * 10 for i in range(10)]
+        pcm = self.channel_data_to_pcm(channels)
+        converted = PCMRecognizer.pcm_to_channel_data(pcm)
+        self.assertEqual(channels, converted)
diff --git a/turntable/turntable.py b/turntable/turntable.py
index ba72417..b533181 100644
--- a/turntable/turntable.py
+++ b/turntable/turntable.py
@@ -55,7 +55,8 @@ class NewMetadata(Event):
 
 
 class PCMRecognizer(BaseRecognizer):
-    def pcm_to_channel_data(self, pcm: PCM) -> List[List[int]]:
+    @staticmethod
+    def pcm_to_channel_data(pcm: PCM) -> List[List[int]]:
         def to_ints(data: bytes) -> List[int]:
             return list(struct.unpack("{}h".format(len(data) // 2), data))
 
@@ -63,7 +64,7 @@ class PCMRecognizer(BaseRecognizer):
         return [stream[channel :: pcm.channels] for channel in range(pcm.channels)]
 
     def recognize(self, pcm: PCM) -> Dict[str, Any]:
-        data = self.pcm_to_channel_data(pcm)
+        data = PCMRecognizer.pcm_to_channel_data(pcm)
         t = time.time()
         matches, fingerprint_time, query_time, align_time = self._recognize(*data)
         t = time.time() - t