Add test to check casing in input variables

tests/render_py_tests.rs

@@ -319,7 +319,7 @@ print("baited,     care spaces")
 }
 
 #[test]
-fn test_stub_input() {
+fn test_stub_input_1() {
     let generator = r##"read init:int
 read x:int
 
@@ -358,6 +358,21 @@ f = float(inputs[1])  # float
     test_stub_builder(generator, expected);
 }
 
+#[test]
+fn test_stub_input_2() {
+    let generator = r##"read A:int
+
+INPUT case sensitive???
+a : NEIN NEIN
+A : ????
+"##;
+
+    let expected = r##"a = int(input())  # ????
+"##;
+
+    test_stub_builder(generator, expected);
+}
+
 #[test]
 fn test_stub_everything() {
     let generator = r##"write many  spaces   here