tests: tdf: add simple parsing check

Add a basic check that parsing works as expected.

Signed-off-by: Jordan Yates <jordan@embeint.com>

Author: JordanYates

tests/tdf/tdf_example.bin

@@ -0,0 +1,28 @@
+import os
+
+from infuse_iot.tdf import TDF
+
+# assert "TOXTEMPDIR" in os.environ, "you must run these tests using tox"
+
+TESTDATA_FILENAME = os.path.join(os.path.dirname(__file__), "tdf_example.bin")
+
+
+def test_tdf():
+    with open(TESTDATA_FILENAME, "rb") as f:
+        test_data = f.read(-1)
+
+    test_blocks = [test_data[i : (i + 512)] for i in range(0, len(test_data), 512)]
+
+    decoder = TDF()
+    total_tdfs = 0
+
+    # Iterate over each block
+    for block in test_blocks:
+        assert len(block) % 512 == 0
+        # Iterate over each TDF in the block
+        for tdf in decoder.decode(block):
+            assert isinstance(tdf, TDF.Reading)
+            total_tdfs += 1
+
+    # Number of TDFs on the example block should never change
+    assert total_tdfs == 53