Refactor tests, move them into integ folder

.gitignore

@@ -1 +1,2 @@
-/target
+/target
+.idea

crates/uplc/tests/integ_tests.rs

@@ -0,0 +1,67 @@
+/// e2e encoding/decoding tests
+use uplc::{
+    ast::{DeBruijn, Name, Program},
+    parser,
+};
+
+fn round_trip_test(bytes: &[u8], code: &str) {
+    parsed_program_matches_decoded_bytes(bytes, code);
+    encoded_program_matches_bytes(bytes, code);
+    can_convert_between_de_bruijn_and_name(bytes, code);
+    decoded_bytes_can_convert_into_code(bytes, code);
+}
+
+fn parsed_program_matches_decoded_bytes(bytes: &[u8], code: &str) {
+    let parsed_program = parser::program(code).unwrap();
+
+    let debruijn_program: Program<DeBruijn> = parsed_program.clone().try_into().unwrap();
+
+    let decoded_program: Program<DeBruijn> = Program::from_flat(bytes).unwrap();
+
+    assert_eq!(debruijn_program, decoded_program);
+}
+
+fn encoded_program_matches_bytes(bytes: &[u8], code: &str) {
+    let parsed_program = parser::program(code).unwrap();
+
+    let debruijn_program: Program<DeBruijn> = parsed_program.clone().try_into().unwrap();
+
+    let encoded_program = debruijn_program.to_flat().unwrap();
+
+    assert_eq!(encoded_program, bytes);
+}
+fn can_convert_between_de_bruijn_and_name(bytes: &[u8], code: &str) {
+    let parsed_program = parser::program(code).unwrap();
+
+    let decoded_program: Program<DeBruijn> = Program::from_flat(bytes).unwrap();
+
+    let name_program: Program<Name> = decoded_program.try_into().unwrap();
+
+    assert_eq!(parsed_program, name_program);
+}
+
+fn decoded_bytes_can_convert_into_code(bytes: &[u8], code: &str) {
+    let decoded_program: Program<DeBruijn> = Program::from_flat(bytes).unwrap();
+
+    let name_program: Program<Name> = decoded_program.try_into().unwrap();
+
+    let pretty = name_program.to_pretty();
+
+    assert_eq!(pretty, code);
+}
+
+#[test]
+fn integer() {
+    let bytes = include_bytes!("../test_data/basic/integer/integer.flat");
+    let code = include_str!("../test_data/basic/integer/integer.uplc");
+
+    round_trip_test(bytes, code);
+}
+
+#[test]
+fn jpg() {
+    let bytes = include_bytes!("../test_data/jpg/jpg.flat");
+    let code = include_str!("../test_data/jpg/jpg.uplc");
+
+    round_trip_test(bytes, code);
+}