diff --git a/spotdl/encode/encoders/avconv.py b/spotdl/encode/encoders/avconv.py
index a3e9de3..4a13429 100644
--- a/spotdl/encode/encoders/avconv.py
+++ b/spotdl/encode/encoders/avconv.py
@@ -1,13 +1,15 @@
 import subprocess
 import os
 from logzero import logger as log
+
 from spotdl.encode import EncoderBase
 from spotdl.encode.exceptions import EncoderNotFoundError
 from spotdl.encode.exceptions import AvconvNotFoundError
 
+
 class EncoderAvconv(EncoderBase):
     def __init__(self, encoder_path="avconv"):
-        print("Using EncoderAvconv is deprecated and will be removed"
+        print("Using EncoderAvconv is deprecated and will be removed",
               "in future versions. Use EncoderFFmpeg instead.")
         encoder_path = encoder_path
         _loglevel = "-loglevel 0"
diff --git a/spotdl/encode/encoders/ffmpeg.py b/spotdl/encode/encoders/ffmpeg.py
index 6818a7d..2a3db2c 100644
--- a/spotdl/encode/encoders/ffmpeg.py
+++ b/spotdl/encode/encoders/ffmpeg.py
@@ -9,8 +9,8 @@ from spotdl.encode.exceptions import FFmpegNotFoundError
 RULES = {
     "m4a": {
         "mp3": "-codec:v copy -codec:a libmp3lame -ar 48000",
-        "webm": "-codec:a libopus -vbr on ",
-        "m4a": "-acodec copy ",
+        "webm": "-codec:a libopus -vbr on",
+        "m4a": "-acodec copy",
         "flac": "-codec:a flac -ar 48000",
     },
     "webm": {
diff --git a/spotdl/encode/encoders/tests/test_avconv.py b/spotdl/encode/encoders/tests/test_avconv.py
new file mode 100644
index 0000000..9cb3631
--- /dev/null
+++ b/spotdl/encode/encoders/tests/test_avconv.py
@@ -0,0 +1,58 @@
+from spotdl.encode import EncoderBase
+from spotdl.encode.exceptions import AvconvNotFoundError
+from spotdl.encode.encoders import EncoderAvconv
+
+import pytest
+
+
+class TestEncoderAvconv:
+    def test_subclass(self):
+        assert issubclass(EncoderAvconv, EncoderBase)
+
+    def test_avconv_not_found_error(self):
+        with pytest.raises(AvconvNotFoundError):
+            EncoderAvconv(encoder_path="/a/nonexistent/path")
+
+
+class TestEncodingDefaults:
+    def encode_command(input_file, output_file):
+        command = [
+            'avconv', '-y', '-loglevel', '0',
+            '-i', input_file,
+            '-ab', '192k',
+            output_file,
+        ]
+        return command
+
+    @pytest.mark.parametrize("files, expected_command", [
+        (("test.m4a", "test.mp3"), encode_command("test.m4a", "test.mp3")),
+        (("abc.m4a", "cba.webm"), encode_command("abc.m4a", "cba.webm")),
+        (("bla bla.m4a", "ble ble.m4a"), encode_command("bla bla.m4a", "ble ble.m4a")),
+        (("😛.m4a", "• tongue.flac"), encode_command("😛.m4a", "• tongue.flac")),
+    ])
+    def test_generate_encode_command(self, files, expected_command):
+        encoder = EncoderAvconv()
+        assert encoder._generate_encode_command(*files) == expected_command
+
+
+class TestEncodingInDebugMode:
+    def debug_encode_command(input_file, output_file):
+        command = [
+            'avconv', '-y', '-loglevel', 'debug',
+            '-i', input_file,
+            '-ab', '192k',
+            output_file,
+        ]
+        return command
+
+    @pytest.mark.parametrize("files, expected_command", [
+        (("test.m4a", "test.mp3"), debug_encode_command("test.m4a", "test.mp3")),
+        (("abc.m4a", "cba.webm"), debug_encode_command("abc.m4a", "cba.webm")),
+        (("bla bla.m4a", "ble ble.m4a"), debug_encode_command("bla bla.m4a", "ble ble.m4a")),
+        (("😛.m4a", "• tongue.flac"), debug_encode_command("😛.m4a", "• tongue.flac")),
+    ])
+    def test_generate_encode_command_with_debug(self, files, expected_command):
+        encoder = EncoderAvconv()
+        encoder.set_debuglog()
+        assert encoder._generate_encode_command(*files) == expected_command
+
diff --git a/spotdl/encode/encoders/tests/test_ffmpeg.py b/spotdl/encode/encoders/tests/test_ffmpeg.py
index 07b34f3..96e233b 100644
--- a/spotdl/encode/encoders/tests/test_ffmpeg.py
+++ b/spotdl/encode/encoders/tests/test_ffmpeg.py
@@ -1,5 +1,5 @@
 from spotdl.encode import EncoderBase
-# from spotdl.encode import exceptions
+from spotdl.encode.exceptions import FFmpegNotFoundError
 from spotdl.encode.encoders import EncoderFFmpeg
 
 import pytest
@@ -9,6 +9,10 @@ class TestEncoderFFmpeg:
     def test_subclass(self):
         assert issubclass(EncoderFFmpeg, EncoderBase)
 
+    def test_ffmpeg_not_found_error(self):
+        with pytest.raises(FFmpegNotFoundError):
+            EncoderFFmpeg(encoder_path="/a/nonexistent/path")
+
 
 class TestEncodingDefaults:
     def m4a_to_mp3_encoder(input_file, output_file):
diff --git a/spotdl/encode/tests/test_encode_base.py b/spotdl/encode/tests/test_encode_base.py
index 7a171bf..f494276 100644
--- a/spotdl/encode/tests/test_encode_base.py
+++ b/spotdl/encode/tests/test_encode_base.py
@@ -1,13 +1,101 @@
 from spotdl.encode import EncoderBase
+from spotdl.encode.exceptions import EncoderNotFoundError
 
 import pytest
 
-def test_abstract_base_class_encoderbase():
-    encoder_path = "ffmpeg"
-    _loglevel = "-hide_banner -nostats -v panic"
-    _additional_arguments = ["-b:a", "192k", "-vn"]
 
-    with pytest.raises(TypeError):
-        # This abstract base class must be inherited from
-        # for instantiation
-        EncoderBase(encoder_path, _loglevel, _additional_arguments)
+class TestAbstractBaseClass:
+    def test_error_abstract_base_class_encoderbase(self):
+        encoder_path = "ffmpeg"
+        _loglevel = "-hide_banner -nostats -v panic"
+        _additional_arguments = ["-b:a", "192k", "-vn"]
+
+        with pytest.raises(TypeError):
+            # This abstract base class must be inherited from
+            # for instantiation
+            EncoderBase(encoder_path, _loglevel, _additional_arguments)
+
+
+    def test_inherit_abstract_base_class_encoderbase(self):
+        class EncoderKid(EncoderBase):
+            def __init__(self, encoder_path, _loglevel, _additional_arguments):
+                super().__init__(encoder_path, _loglevel, _additional_arguments)
+
+            def _generate_encode_command(self):
+                pass
+
+            def _generate_encoding_arguments(self):
+                pass
+
+            def get_encoding(self):
+                pass
+
+            def re_encode(self):
+                pass
+
+            def set_argument(self):
+                pass
+
+            def set_debuglog(self):
+                pass
+
+
+        encoder_path = "ffmpeg"
+        _loglevel = "-hide_banner -nostats -v panic"
+        _additional_arguments = ["-b:a", "192k", "-vn"]
+
+        EncoderKid(encoder_path, _loglevel, _additional_arguments)
+
+
+class TestMethods:
+    class EncoderKid(EncoderBase):
+        def __init__(self, encoder_path, _loglevel, _additional_arguments):
+            super().__init__(encoder_path, _loglevel, _additional_arguments)
+
+        def _generate_encode_command(self, input_file, output_file):
+            pass
+
+        def _generate_encoding_arguments(self, input_encoding, output_encoding):
+            pass
+
+        def get_encoding(self, filename):
+            return super().get_encoding(filename)
+
+        def re_encode(self, input_encoding, output_encoding):
+            pass
+
+        def set_argument(self, argument):
+            super().set_argument(argument)
+
+        def set_debuglog(self):
+            pass
+
+
+    @pytest.fixture(scope="module")
+    def encoderkid(self):
+        encoder_path = "ffmpeg"
+        _loglevel = "-hide_banner -nostats -v panic"
+        _additional_arguments = []
+
+        encoderkid = self.EncoderKid(encoder_path, _loglevel, _additional_arguments)
+        return encoderkid
+
+    def test_set_argument(self, encoderkid):
+        encoderkid.set_argument("-parameter argument")
+        assert encoderkid._additional_arguments == [
+            "-parameter",
+            "argument",
+        ]
+
+    @pytest.mark.parametrize("filename, encoding", [
+        ("example.m4a", "m4a"),
+        ("exampley.mp3", "mp3"),
+        ("test 123.webm", "webm"),
+        ("flakey.flac", "flac"),
+    ])
+    def test_get_encoding(self, encoderkid, filename, encoding):
+        assert encoderkid.get_encoding(filename) == encoding
+
+    def test_encoder_not_found_error(self):
+        with pytest.raises(EncoderNotFoundError):
+            self.EncoderKid("/a/nonexistent/path", "0", [])
diff --git a/spotdl/encode/tests/test_exceptions.py b/spotdl/encode/tests/test_exceptions.py
index 56adbb5..654b452 100644
--- a/spotdl/encode/tests/test_exceptions.py
+++ b/spotdl/encode/tests/test_exceptions.py
@@ -6,6 +6,9 @@ import pytest
 
 
 class TestEncoderNotFoundSubclass:
+    def test_encoder_not_found_subclass(self):
+        assert issubclass(FFmpegNotFoundError, Exception)
+
     def test_ffmpeg_not_found_subclass(self):
         assert issubclass(FFmpegNotFoundError, EncoderNotFoundError)
 
diff --git a/spotdl/lyrics/lyric_base.py b/spotdl/lyrics/lyric_base.py
index 895323b..4468c36 100644
--- a/spotdl/lyrics/lyric_base.py
+++ b/spotdl/lyrics/lyric_base.py
@@ -6,7 +6,7 @@ from abc import abstractmethod
 
 class LyricBase(ABC):
     @abstractmethod
-    def __init__(self, artist, song):
+    def __init__(self, artist, track):
         pass
 
     @abstractmethod
diff --git a/spotdl/lyrics/providers/genius.py b/spotdl/lyrics/providers/genius.py
index e095387..b599b4a 100644
--- a/spotdl/lyrics/providers/genius.py
+++ b/spotdl/lyrics/providers/genius.py
@@ -8,13 +8,13 @@ BASE_URL = "https://genius.com"
 
 
 class Genius(LyricBase):
-    def __init__(self, artist, song):
+    def __init__(self, artist, track):
         self.artist = artist
-        self.song = song
+        self.track = track
         self.base_url = BASE_URL
 
     def _guess_lyric_url(self):
-        query = "/{} {} lyrics".format(self.artist, self.song)
+        query = "/{} {} lyrics".format(self.artist, self.track)
         query = query.replace(" ", "-")
         encoded_query = urllib.request.quote(query)
         lyric_url = self.base_url + encoded_query
@@ -28,7 +28,7 @@ class Genius(LyricBase):
         except urllib.request.HTTPError:
             raise LyricsNotFoundError(
                 "Could not find lyrics for {} - {} at URL: {}".format(
-                    self.artist, self.song, url
+                    self.artist, self.track, url
                 )
             )
         else:
diff --git a/spotdl/lyrics/providers/lyricwikia_wrapper.py b/spotdl/lyrics/providers/lyricwikia_wrapper.py
index e7fb893..6511657 100644
--- a/spotdl/lyrics/providers/lyricwikia_wrapper.py
+++ b/spotdl/lyrics/providers/lyricwikia_wrapper.py
@@ -5,13 +5,13 @@ from spotdl.lyrics.exceptions import LyricsNotFoundError
 
 
 class LyricWikia(LyricBase):
-    def __init__(self, artist, song):
+    def __init__(self, artist, track):
         self.artist = artist
-        self.song = song
+        self.track = track
 
     def get_lyrics(self, linesep="\n", timeout=None):
         try:
-            lyrics = lyricwikia.get_lyrics(self.artist, self.song, linesep, timeout)
+            lyrics = lyricwikia.get_lyrics(self.artist, self.track, linesep, timeout)
         except lyricwikia.LyricsNotFound as e:
             raise LyricsNotFoundError(e.args[0])
         else:
diff --git a/spotdl/lyrics/providers/tests/test_genius.py b/spotdl/lyrics/providers/tests/test_genius.py
index 95f5c73..44991e5 100644
--- a/spotdl/lyrics/providers/tests/test_genius.py
+++ b/spotdl/lyrics/providers/tests/test_genius.py
@@ -12,7 +12,7 @@ class TestGenius:
 
     @pytest.fixture(scope="module")
     def track(self):
-        return Genius("artist", "song")
+        return Genius("artist", "track")
 
     def test_base_url(self, track):
         assert track.base_url == "https://genius.com"
diff --git a/spotdl/lyrics/tests/test_exceptions.py b/spotdl/lyrics/tests/test_exceptions.py
new file mode 100644
index 0000000..7cc7bdc
--- /dev/null
+++ b/spotdl/lyrics/tests/test_exceptions.py
@@ -0,0 +1,5 @@
+from spotdl.lyrics.exceptions import LyricsNotFoundError
+
+def test_lyrics_not_found_subclass():
+    assert issubclass(LyricsNotFoundError, Exception)
+
diff --git a/spotdl/lyrics/tests/test_lyric_base.py b/spotdl/lyrics/tests/test_lyric_base.py
new file mode 100644
index 0000000..cfa9e86
--- /dev/null
+++ b/spotdl/lyrics/tests/test_lyric_base.py
@@ -0,0 +1,29 @@
+from spotdl.lyrics import LyricBase
+
+import pytest
+
+
+class TestAbstractBaseClass:
+    def test_error_abstract_base_class_lyricbase(self):
+        artist = "awesome artist"
+        track = "amazing track"
+
+        with pytest.raises(TypeError):
+            # This abstract base class must be inherited from
+            # for instantiation
+            LyricBase(artist, track)
+
+
+    def test_inherit_abstract_base_class_encoderbase(self):
+        class LyricKid(LyricBase):
+            def __init__(self, artist, track):
+                super().__init__(artist, track)
+
+            def get_lyrics(self):
+                pass
+
+
+        artist = "awesome artist"
+        track = "amazing track"
+
+        LyricKid(artist, track)