Add a new test of decoding jpeg image

Author: jepler

tests/circuitpython/jpegio_decompress.py

@@ -0,0 +1,73 @@
+from displayio import Bitmap
+import binascii
+import jpegio
+
+content = binascii.a2b_base64(
+    b"""
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+)
+
+decoder = jpegio.JpegDecoder()
+
+
+def test(jpeg_input, scale):
+    w, h = decoder.decode(jpeg_input, scale=scale)
+    print(f"{w}x{h}")
+
+    b = Bitmap(w, h, 65535)
+
+    decoder.decode(jpeg_input, b, scale=scale)
+
+    for y in range(min(30, h)):
+        for x in range(min(72, w)):
+            print(end="#" if (b[x, y] & 0x7E0) < 0x400 else " ")
+        print("..." if w > 72 else "")
+    print("...\n" if h > 24 else "")
+
+
+test(content, scale=0)
+test(content, scale=1)
+test(content, scale=2)
+test(content, scale=3)