Add lameenc test script (#814)

server/pypi/packages/lameenc/test.py

@@ -0,0 +1,35 @@
+import unittest
+
+
+class TestLameenc(unittest.TestCase):
+
+    # https://github.com/chrisstaite/lameenc/blob/master/README.md
+    def test_basic(self):
+        import lameenc
+        import os
+
+        BIT_RATE = 128
+        SAMPLE_RATE = 16000
+        CHANNELS = 2
+        BITS_PER_SAMPLE = 16
+
+        encoder = lameenc.Encoder()
+        encoder.set_bit_rate(BIT_RATE)
+        encoder.set_in_sample_rate(SAMPLE_RATE)
+        encoder.set_channels(CHANNELS)
+        encoder.set_quality(2)  # 2-highest, 7-fastest
+
+        # Generate 1 second of noise
+        pcm = os.urandom(SAMPLE_RATE * CHANNELS * BITS_PER_SAMPLE // 8)
+
+        mp3_data = encoder.encode(pcm)
+        mp3_data += encoder.flush()
+
+        # Header starts at a byte boundary with an 11-bit sync word, which is all 1s.
+        self.assertEqual(mp3_data[0], 0xff)
+        self.assertIn(mp3_data[1] & 0xf0, [0xe0, 0xf0])
+
+        # Length should be approximately equal to bit rate.
+        byte_rate = BIT_RATE * 1000 // 8
+        self.assertGreater(len(mp3_data), byte_rate * 0.75)
+        self.assertLess(len(mp3_data), byte_rate * 1.25)