tests: add simple gen test

tests/cases/generator/01_simple_types.midas

@@ -0,0 +1,14 @@
+type Meter = float
+type Second = float
+type MeterPerSecond = float
+
+extend Meter {
+    def __add__: fn(Meter, /) -> Meter
+    def __sub__: fn(Meter, /) -> Meter
+    def __truediv__: fn(Second, /) -> MeterPerSecond
+}
+
+extend Second {
+    def __add__: fn(Second, /) -> Second
+    def __sub__: fn(Second, /) -> Second
+}

tests/cases/generator/01_simple_types.py

@@ -0,0 +1,5 @@
+from midas import cast, Meter, Second
+
+distance: Meter = cast(Meter, 123.45)
+time: Second = cast(Second, 6.7)
+speed = distance / time

tests/cases/generator/01_simple_types.py.ref.txt

@@ -0,0 +1,79 @@
+Module(
+  body=[
+    ImportFrom(
+      module='midas',
+      names=[
+        alias(name='cast'),
+        alias(name='Meter'),
+        alias(name='Second')],
+      level=0),
+    Assign(
+      targets=[
+        Name(id='__midas_alias_0__')],
+      value=Constant(value=123.45)),
+    Assert(
+      test=Call(
+        func=Name(id='isinstance'),
+        args=[
+          Name(id='__midas_alias_0__'),
+          Name(id='float')],
+        keywords=[]),
+      msg=JoinedStr(
+        values=[
+          Constant(value='01_simple_types.py:L3:19: CastError: Cannot cast '),
+          FormattedValue(
+            value=Attribute(
+              value=Call(
+                func=Name(id='type'),
+                args=[
+                  Name(id='__midas_alias_0__')],
+                keywords=[]),
+              attr='__name__'),
+            conversion=-1),
+          Constant(value=' to float')])),
+    Assign(
+      targets=[
+        Name(id='distance')],
+      value=Name(id='__midas_alias_0__')),
+    Delete(
+      targets=[
+        Name(id='__midas_alias_0__')]),
+    Assign(
+      targets=[
+        Name(id='__midas_alias_1__')],
+      value=Constant(value=6.7)),
+    Assert(
+      test=Call(
+        func=Name(id='isinstance'),
+        args=[
+          Name(id='__midas_alias_1__'),
+          Name(id='float')],
+        keywords=[]),
+      msg=JoinedStr(
+        values=[
+          Constant(value='01_simple_types.py:L4:16: CastError: Cannot cast '),
+          FormattedValue(
+            value=Attribute(
+              value=Call(
+                func=Name(id='type'),
+                args=[
+                  Name(id='__midas_alias_1__')],
+                keywords=[]),
+              attr='__name__'),
+            conversion=-1),
+          Constant(value=' to float')])),
+    Assign(
+      targets=[
+        Name(id='time')],
+      value=Name(id='__midas_alias_1__')),
+    Delete(
+      targets=[
+        Name(id='__midas_alias_1__')]),
+    Assign(
+      targets=[
+        Name(id='speed')],
+      value=BinOp(
+        left=Name(id='distance'),
+        op=Div(),
+        right=Name(id='time')))],
+  type_ignores=[])