Use here-doc for stdin if both stdin and arguments are used

tested/dsl/translate_parser.py

@@ -90,6 +90,13 @@
 )
 
 
+def _ensure_trailing_newline(text: str) -> str:
+    if text[-1] != "\n":
+        return text + "\n"
+    else:
+        return text
+
+
 def _parse_yaml_value(loader: yaml.Loader, node: yaml.Node) -> Any:
     if isinstance(node, yaml.MappingNode):
         result = loader.construct_mapping(node)
@@ -442,7 +449,7 @@
     else:
         if "stdin" in testcase:
             assert isinstance(testcase["stdin"], str)
-            stdin = TextData(data=testcase["stdin"])
+            stdin = TextData(data=_ensure_trailing_newline(testcase["stdin"]))
         else:
             stdin = EmptyChannel.NONE
         arguments = testcase.get("arguments", [])

tested/languages/generation.py

@@ -89,6 +89,14 @@ def _handle_link_files(link_files: Iterable[FileUrl], language: str) -> tuple[st
     )
 
 
+def _get_heredoc_token(stdin: str) -> str:
+    delimiter = "STDIN"
+    stdin_lines = stdin.splitlines()
+    while delimiter in stdin:
+        delimiter = delimiter + "N"
+    return delimiter
+
+
 def get_readable_input(
     bundle: Bundle, case: Testcase
 ) -> tuple[ExtendedMessage, set[FileUrl]]:
@@ -113,20 +121,26 @@ def get_readable_input(
         assert isinstance(case.input, MainInput)
         # See https://rouge-ruby.github.io/docs/Rouge/Lexers/ConsoleLexer.html
         format_ = "console"
+        # Determine the command (with arguments)
         submission = submission_name(bundle.language)
         command = shlex.join([submission] + case.input.arguments)
         args = f"$ {command}"
+        # Determine the stdin
         if isinstance(case.input.stdin, TextData):
             stdin = case.input.stdin.get_data_as_string(bundle.config.resources)
         else:
             stdin = ""
-        if not stdin:
-            text = args
+
+        # If we have both stdin and arguments, we use a here-document.
+        if case.input.arguments and stdin:
+            assert stdin[-1] == "\n", "stdin must end with a newline"
+            delimiter = _get_heredoc_token(stdin)
+            text = f"{args} << '{delimiter}'\n{stdin}{delimiter}"
+        elif stdin:
+            assert not case.input.arguments
+            text = stdin
         else:
-            if case.input.arguments:
-                text = f"{args}\n{stdin}"
-            else:
-                text = stdin
+            text = args
     elif isinstance(case.input, Statement):
         format_ = bundle.config.programming_language
         text = generate_statement(bundle, case.input)

tests/test_dsl_yaml.py

@@ -62,7 +62,7 @@ def test_parse_one_tab_ctx():
     assert len(context.testcases) == 1
     tc = context.testcases[0]
     assert tc.is_main_testcase()
-    assert tc.input.stdin.data == "Input string"
+    assert tc.input.stdin.data == "Input string\n"
     assert tc.input.arguments == ["--arg", "argument"]
     assert tc.output.stderr.data == "Error string"
     assert tc.output.stdout.data == "Output string"

tests/test_functionality.py

@@ -25,7 +25,7 @@
     NumberType,
     StringType,
 )
-from tested.testsuite import Context, MainInput, Suite, Tab, Testcase
+from tested.testsuite import Context, MainInput, Suite, Tab, Testcase, TextData
 from tests.manual_utils import assert_valid_output, configuration, execute_config
 
 COMPILE_LANGUAGES = [
@@ -1036,3 +1036,48 @@ def test_main_call_quotes(tmp_path: Path, pytestconfig):
     assert (
         actual.description == "$ submission hello 'it'\"'\"'s' '$yes' --hello=no -hello"
     )
+
+
+def test_stdin_and_arguments_use_heredoc(tmp_path: Path, pytestconfig):
+    conf = configuration(
+        pytestconfig,
+        "echo-function",
+        "bash",
+        tmp_path,
+        "two.yaml",
+        "top-level-output",
+    )
+    the_input = Testcase(
+        input=MainInput(
+            arguments=["hello"], stdin=TextData(data="One line\nSecond line\n")
+        )
+    )
+    suite = Suite(tabs=[Tab(contexts=[Context(testcases=[the_input])], name="hallo")])
+    bundle = create_bundle(conf, sys.stdout, suite)
+    actual, _ = get_readable_input(bundle, the_input)
+
+    assert (
+        actual.description
+        == "$ submission hello << 'STDIN'\nOne line\nSecond line\nSTDIN"
+    )
+
+
+def test_stdin_token_is_unique(tmp_path: Path, pytestconfig):
+    conf = configuration(
+        pytestconfig,
+        "echo-function",
+        "bash",
+        tmp_path,
+        "two.yaml",
+        "top-level-output",
+    )
+    the_input = Testcase(
+        input=MainInput(arguments=["hello"], stdin=TextData(data="One line\nSTDIN\n"))
+    )
+    suite = Suite(tabs=[Tab(contexts=[Context(testcases=[the_input])], name="hallo")])
+    bundle = create_bundle(conf, sys.stdout, suite)
+    actual, _ = get_readable_input(bundle, the_input)
+
+    assert (
+        actual.description == "$ submission hello << 'STDINN'\nOne line\nSTDIN\nSTDINN"
+    )