diff --git a/src/commands/test_command.py b/src/commands/test_command.py
index 5fe39cd..a37ef42 100644
--- a/src/commands/test_command.py
+++ b/src/commands/test_command.py
@@ -1,23 +1,35 @@
 """Test command for competitive programming."""
 import click
+import concurrent.futures
 import tempfile
 import sys
 import os
 import subprocess
+import time
 
 from config import load_config
 from plugins.cpp_plugin import CppPreprocessor
 from plugins.rust_plugin import RustPreprocessor
 
 
-@click.command(name="test")
+@click.command(name="test", context_settings={"ignore_unknown_options": True, "allow_extra_args": True})
+@click.argument('args', nargs=-1, type=click.UNPROCESSED)
+def test(args):
+    """Compile/run one case, or use `test suite` for multi-case runs."""
+    if args and args[0] == "suite":
+        suite_cmd.main(args=list(args[1:]), prog_name="test suite", standalone_mode=False)
+    else:
+        single_cmd.main(args=list(args), prog_name="test", standalone_mode=False)
+
+
+@click.command(name="run")
 @click.argument('file', type=click.Path(exists=True, resolve_path=True))
 @click.option('-i', '--input', 'input_file', type=click.Path(exists=True, resolve_path=True), help='Input file to feed to the program')
 @click.option('-e', '--expected', 'expected_file', type=click.Path(exists=True, resolve_path=True), help='Expected output file for comparison')
 @click.option('--preprocess', is_flag=True, help='Preprocess the file before compiling')
 @click.option('-I', '--include-path', 'include_paths', multiple=True, type=click.Path(exists=True, file_okay=False, resolve_path=True), help='Include paths for preprocessing')
 @click.option('--rust', is_flag=True, help='Force Rust mode (auto-detected from .rs extension)')
-def test(file, input_file, expected_file, preprocess, include_paths, rust):
+def single_cmd(file, input_file, expected_file, preprocess, include_paths, rust):
     """Compile and run C++ or Rust code with optional test input/output comparison."""
     # Auto-detect language from file extension
     file_ext = os.path.splitext(file)[1].lower()
@@ -35,6 +47,184 @@ def test(file, input_file, expected_file, preprocess, include_paths, rust):
         _test_cpp(file, input_file, expected_file, preprocess, include_paths)
 
 
+@click.command(name="suite")
+@click.argument('file', type=click.Path(exists=True, resolve_path=True))
+@click.argument('cases_dir', type=click.Path(exists=True, file_okay=False, resolve_path=True))
+@click.option('--pattern', default='*.in', show_default=True, help='Input filename glob inside cases_dir')
+@click.option('-j', '--workers', default=1, show_default=True, type=click.IntRange(min=1), help='Parallel case worker count')
+@click.option('--timeout', type=float, help='Per-case timeout in seconds (defaults to prepkit_config.yaml test.timeout or 5)')
+@click.option('--preprocess', is_flag=True, help='Preprocess the file before compiling')
+@click.option('-I', '--include-path', 'include_paths', multiple=True, type=click.Path(exists=True, file_okay=False, resolve_path=True), help='Include paths for preprocessing')
+@click.option('--rust', is_flag=True, help='Force Rust mode (auto-detected from .rs extension)')
+def suite_cmd(file, cases_dir, pattern, workers, timeout, preprocess, include_paths, rust):
+    """Compile once and run an exact-match test suite over *.in/*.out cases."""
+    config = load_config()
+    timeout = timeout if timeout is not None else config.get("test", {}).get("timeout", 5)
+
+    file_ext = os.path.splitext(file)[1].lower()
+    is_rust = rust or file_ext == '.rs'
+    is_cpp = file_ext in ['.cpp', '.cc', '.cxx', '.c++']
+
+    if not is_rust and not is_cpp:
+        click.echo(f"❌ Unsupported file extension: {file_ext}", err=True)
+        click.echo("   Supported: .cpp, .cc, .cxx, .c++, .rs", err=True)
+        sys.exit(1)
+
+    cases = _discover_suite_cases(cases_dir, pattern)
+    if not cases:
+        click.echo(f"❌ No cases found in {cases_dir} matching {pattern} with .out files", err=True)
+        sys.exit(1)
+
+    executable = None
+    source_file = None
+    try:
+        source_file = _prepare_source_for_compile(file, preprocess, include_paths, is_rust, config)
+        executable = _compile_for_suite(file, source_file, is_rust, config)
+
+        click.echo(f"Running {len(cases)} case(s) with {workers} worker(s)...")
+        results = []
+        with concurrent.futures.ThreadPoolExecutor(max_workers=workers) as executor:
+            futures = [
+                executor.submit(_run_suite_case, executable, input_file, expected_file, timeout)
+                for input_file, expected_file in cases
+            ]
+            for future in concurrent.futures.as_completed(futures):
+                results.append(future.result())
+
+        results.sort(key=lambda result: result["case"])
+        passed = sum(1 for result in results if result["passed"])
+
+        click.echo("\n--- Suite Results ---")
+        for result in results:
+            status = "PASS" if result["passed"] else "FAIL"
+            click.echo(f"{status} {result['case']} ({result['runtime']:.3f}s)")
+            if not result["passed"] and result["error"]:
+                click.echo(f"  {result['error']}")
+
+        click.echo(f"\nSummary: {passed}/{len(results)} passed")
+        if passed != len(results):
+            sys.exit(1)
+    finally:
+        if preprocess and source_file and os.path.exists(source_file):
+            os.remove(source_file)
+        if executable and os.path.exists(executable):
+            os.remove(executable)
+
+
+def _discover_suite_cases(cases_dir, pattern):
+    input_files = sorted(
+        os.path.join(cases_dir, filename)
+        for filename in os.listdir(cases_dir)
+        if _matches_case_pattern(filename, pattern)
+    )
+    cases = []
+    for input_file in input_files:
+        expected_file = os.path.splitext(input_file)[0] + ".out"
+        if os.path.exists(expected_file):
+            cases.append((input_file, expected_file))
+    return cases
+
+
+def _matches_case_pattern(filename, pattern):
+    if pattern == "*.in":
+        return filename.endswith(".in")
+    import fnmatch
+    return fnmatch.fnmatch(filename, pattern)
+
+
+def _prepare_source_for_compile(file, preprocess, include_paths, is_rust, config):
+    if not preprocess:
+        return file
+
+    if is_rust:
+        rust_preprocess_config = config.get("rust_preprocess", {})
+        config_include_paths = rust_preprocess_config.get("include_paths", [])
+        preprocessor = RustPreprocessor()
+        preprocessed_code = preprocessor.preprocess(file, list(config_include_paths) + list(include_paths))
+        suffix = ".rs"
+    else:
+        cpp_preprocess_config = config.get("cpp_preprocess", {})
+        config_include_paths = cpp_preprocess_config.get("include_paths", [])
+        preprocessor = CppPreprocessor()
+        preprocessed_code = preprocessor.preprocess(file, list(config_include_paths) + list(include_paths))
+        suffix = ".cpp"
+
+    with tempfile.NamedTemporaryFile(mode='w', suffix=suffix, delete=False) as tmp:
+        tmp.write(preprocessed_code)
+        return tmp.name
+
+
+def _compile_for_suite(original_file, source_file, is_rust, config):
+    executable = tempfile.NamedTemporaryFile(delete=False, suffix='.out')
+    executable.close()
+
+    if is_rust:
+        rust_compile_config = config.get("rust_compile", {})
+        compiler_edition = rust_compile_config.get("edition", "2021")
+        compiler_flags = rust_compile_config.get("flags", [])
+        compile_cmd = ['rustc', source_file, '-o', executable.name, f'--edition={compiler_edition}'] + compiler_flags
+    else:
+        cpp_compile_config = config.get("cpp_compile", {})
+        compiler_std = cpp_compile_config.get("std", "c++17")
+        compiler_flags = cpp_compile_config.get("flags", [])
+        compile_cmd = ['g++', source_file, '-o', executable.name, f'-std={compiler_std}'] + compiler_flags
+
+    click.echo(f"Compiling {os.path.basename(original_file)}...")
+    compile_result = subprocess.run(compile_cmd, capture_output=True, text=True)
+    if compile_result.returncode != 0:
+        click.echo("❌ Compilation failed", err=True)
+        click.echo("Compiler output:", err=True)
+        click.echo(compile_result.stderr, err=True)
+        if os.path.exists(executable.name):
+            os.remove(executable.name)
+        sys.exit(1)
+
+    click.echo("✓ Compilation successful")
+    return executable.name
+
+
+def _run_suite_case(executable, input_file, expected_file, timeout):
+    with open(input_file, 'r') as f:
+        stdin_data = f.read()
+    with open(expected_file, 'r') as f:
+        expected_output = f.read()
+
+    started = time.perf_counter()
+    try:
+        run_result = subprocess.run(
+            [executable],
+            input=stdin_data,
+            capture_output=True,
+            text=True,
+            timeout=timeout,
+        )
+        runtime = time.perf_counter() - started
+    except subprocess.TimeoutExpired:
+        return {
+            "case": os.path.basename(input_file),
+            "passed": False,
+            "runtime": timeout,
+            "error": f"timed out after {timeout}s",
+        }
+
+    if run_result.returncode != 0:
+        return {
+            "case": os.path.basename(input_file),
+            "passed": False,
+            "runtime": runtime,
+            "error": f"runtime error: {run_result.stderr.strip()}",
+        }
+
+    passed = run_result.stdout.strip() == expected_output.strip()
+    error = "" if passed else "output differs from expected"
+    return {
+        "case": os.path.basename(input_file),
+        "passed": passed,
+        "runtime": runtime,
+        "error": error,
+    }
+
+
 def _test_cpp(file, input_file, expected_file, preprocess, include_paths):
     """Test C++ code."""
     # Load config for defaults
diff --git a/tests/test_test_command.py b/tests/test_test_command.py
index db0827b..09af231 100644
--- a/tests/test_test_command.py
+++ b/tests/test_test_command.py
@@ -197,6 +197,63 @@ def test_cpp_still_works(self, tmp_path):
         assert "✓ Compilation successful" in result.output
         assert "C++ still works!" in result.output
 
+    @pytest.mark.skipif(os.system("which g++ > /dev/null 2>&1") != 0, reason="g++ not available")
+    def test_cpp_suite_all_cases_pass(self, tmp_path):
+        """Test parallel exact-match suite execution for C++."""
+        test_file = tmp_path / "add.cpp"
+        test_file.write_text("""
+#include <iostream>
+
+int main() {
+    int a, b;
+    std::cin >> a >> b;
+    std::cout << a + b << std::endl;
+    return 0;
+}
+""")
+
+        cases_dir = tmp_path / "cases"
+        cases_dir.mkdir()
+        (cases_dir / "001.in").write_text("1 2\n")
+        (cases_dir / "001.out").write_text("3\n")
+        (cases_dir / "002.in").write_text("10 20\n")
+        (cases_dir / "002.out").write_text("30\n")
+
+        runner = CliRunner()
+        result = runner.invoke(cli, ['test', 'suite', str(test_file), str(cases_dir), '--workers', '2'])
+
+        assert result.exit_code == 0
+        assert "Running 2 case(s) with 2 worker(s)..." in result.output
+        assert "PASS 001.in" in result.output
+        assert "PASS 002.in" in result.output
+        assert "Summary: 2/2 passed" in result.output
+
+    @pytest.mark.skipif(os.system("which g++ > /dev/null 2>&1") != 0, reason="g++ not available")
+    def test_cpp_suite_reports_failure(self, tmp_path):
+        """Test suite failure reporting for mismatched expected output."""
+        test_file = tmp_path / "constant.cpp"
+        test_file.write_text("""
+#include <iostream>
+
+int main() {
+    std::cout << 1 << std::endl;
+    return 0;
+}
+""")
+
+        cases_dir = tmp_path / "cases"
+        cases_dir.mkdir()
+        (cases_dir / "bad.in").write_text("\n")
+        (cases_dir / "bad.out").write_text("2\n")
+
+        runner = CliRunner()
+        result = runner.invoke(cli, ['test', 'suite', str(test_file), str(cases_dir)])
+
+        assert result.exit_code == 1
+        assert "FAIL bad.in" in result.output
+        assert "output differs from expected" in result.output
+        assert "Summary: 0/1 passed" in result.output
+
 
 class TestTestCommandErrorHandling:
     """Test error handling for the test command."""