add tests

.vscode/settings.json

@@ -1,3 +1,8 @@
 {
-    "python.linting.enabled": true
+    "python.linting.enabled": true,
+    "python.testing.pytestArgs": [
+        "tests"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true,
 }

tests/test_emulator.py

@@ -0,0 +1,26 @@
+from turinglab.emulator import Emulator
+from turinglab.output import to_docx
+
+def test_emulator():
+
+    blank_symbol = '_'
+
+    instructions = {
+        '0': [['1', '>', 0], ['0', '<', 1]],
+        '1': [['0', '>', 0], ['1', '<', 1]],
+        blank_symbol: [[blank_symbol, '<', 1], [blank_symbol, '>', -1]]
+    }
+
+    input_string = '010'
+
+    tm = Emulator(instructions, input_string, blank_symbol)
+
+    while not tm.stopped:
+        tm.step()
+
+    head, _, tape = tm.info()
+    output_string = "".join(tape.values()).strip(blank_symbol)
+
+    assert output_string == '101'
+    assert head == 0
+