Unittests for esphome python code (#931)

tests/unit_tests/test_config_validation.py

@@ -0,0 +1,113 @@
+import pytest
+import string
+
+from hypothesis import given, example
+from hypothesis.strategies import one_of, text, integers, booleans, builds
+
+from esphome import config_validation
+from esphome.config_validation import Invalid
+from esphome.core import Lambda, HexInt
+
+
+def test_check_not_tamplatable__invalid():
+    with pytest.raises(Invalid, match="This option is not templatable!"):
+        config_validation.check_not_templatable(Lambda(""))
+
+
+@given(one_of(
+    booleans(),
+    integers(),
+    text(alphabet=string.ascii_letters + string.digits)),
+)
+def test_alphanumeric__valid(value):
+    actual = config_validation.alphanumeric(value)
+
+    assert actual == str(value)
+
+
+@given(value=text(alphabet=string.ascii_lowercase + string.digits + "_"))
+def test_valid_name__valid(value):
+    actual = config_validation.valid_name(value)
+
+    assert actual == value
+
+
+@pytest.mark.parametrize("value", (
+    "foo bar", "FooBar", "foo::bar"
+))
+def test_valid_name__invalid(value):
+    with pytest.raises(Invalid):
+        config_validation.valid_name(value)
+
+
+@given(one_of(integers(), text()))
+def test_string__valid(value):
+    actual = config_validation.string(value)
+
+    assert actual == str(value)
+
+
+@pytest.mark.parametrize("value", (
+    {}, [], True, False, None
+))
+def test_string__invalid(value):
+    with pytest.raises(Invalid):
+        config_validation.string(value)
+
+
+@given(text())
+def test_strict_string__valid(value):
+    actual = config_validation.string_strict(value)
+
+    assert actual == value
+
+
+@pytest.mark.parametrize("value", (None, 123))
+def test_string_string__invalid(value):
+    with pytest.raises(Invalid, match="Must be string, got"):
+        config_validation.string_strict(value)
+
+
+@given(builds(lambda v: "mdi:" + v, text()))
+@example("")
+def test_icon__valid(value):
+    actual = config_validation.icon(value)
+
+    assert actual == value
+
+
+def test_icon__invalid():
+    with pytest.raises(Invalid, match="Icons should start with prefix"):
+        config_validation.icon("foo")
+
+
+@pytest.mark.parametrize("value", (
+    "True", "YES", "on", "enAblE", True
+))
+def test_boolean__valid_true(value):
+    assert config_validation.boolean(value) is True
+
+
+@pytest.mark.parametrize("value", (
+    "False", "NO", "off", "disAblE", False
+))
+def test_boolean__valid_false(value):
+    assert config_validation.boolean(value) is False
+
+
+@pytest.mark.parametrize("value", (
+    None, 1, 0, "foo"
+))
+def test_boolean__invalid(value):
+    with pytest.raises(Invalid, match="Expected boolean value"):
+        config_validation.boolean(value)
+
+
+# TODO: ensure_list
+@given(integers())
+def hex_int__valid(value):
+    actual = config_validation.hex_int(value)
+
+    assert isinstance(actual, HexInt)
+    assert actual == value
+