Add new test for checking dummy TJA errors

testing/data/dummy_tjas/basic_song.tja

@@ -0,0 +1,17 @@
+// This song contains only basic notes.
+BPM:120
+OFFSET:-1.00
+
+COURSE:Oni
+LEVEL:10
+BALLOON:8,8
+SCOREINIT:400
+SCOREDIFF:100
+
+#START
+1020304,
+5000008,
+6000008,
+7000008,
+9000008,
+#END

testing/test_command_support.py

@@ -0,0 +1,70 @@
+import os
+import subprocess
+from subprocess import CalledProcessError
+import shutil
+import glob
+import traceback
+
+import pytest
+
+from tja2fumen import main as convert
+
+
+@pytest.mark.parametrize('id_song,err_msg', [
+    ['basic_song', None]
+])
+def test_expected_errors(id_song, err_msg, tmp_path, entry_point):
+    # Define the testing directory
+    path_test = os.path.dirname(os.path.realpath(__file__))
+
+    # Define the working directory
+    path_temp = os.path.join(tmp_path, id_song)
+    os.mkdir(path_temp)
+
+    # Copy input TJA to working directory
+    path_tja = os.path.join(path_test, "data", "dummy_tjas", f"{id_song}.tja")
+    path_tja_tmp = os.path.join(path_temp, f"{id_song}.tja")
+    shutil.copy(path_tja, path_tja_tmp)
+
+    # Try to convert TJA file to fumen files, then check the error traceback
+    tb = call_conversion_func(path_test, path_tja_tmp, err_msg, entry_point)
+    if err_msg:
+        assert err_msg in tb
+    else:
+        assert tb == ''
+
+
+def call_conversion_func(path_test, path_tja_tmp, err_msg, entry_point):
+    tb = ''
+
+    if entry_point == "python-api":
+        if not err_msg:
+            convert(argv=[path_tja_tmp])
+        else:
+            with pytest.raises(ValueError) as e:
+                convert(argv=[path_tja_tmp])
+            tb = "".join(traceback.format_tb(e.tb))
+
+    elif entry_point == "python-cli":
+        if not err_msg:
+            subprocess.check_output(f"tja2fumen {path_tja_tmp}", text=True,
+                                    shell=True, stderr=subprocess.STDOUT)
+        else:
+            with pytest.raises(CalledProcessError) as e:
+                subprocess.check_output(f"tja2fumen {path_tja_tmp}", text=True,
+                                        shell=True, stderr=subprocess.STDOUT)
+            tb = e.value.output
+
+    elif entry_point == "exe":
+        exe_glob = os.path.join(os.path.split(path_test)[0], "dist", "*.exe")
+        exe = glob.glob(exe_glob)[0]
+        if not err_msg:
+            subprocess.check_output(f"{exe} {path_tja_tmp}", text=True,
+                                    shell=True, stderr=subprocess.STDOUT)
+        else:
+            with pytest.raises(CalledProcessError) as e:
+                subprocess.check_output(f"{exe} {path_tja_tmp}", text=True,
+                                        shell=True, stderr=subprocess.STDOUT)
+            tb = e.value.output
+
+    return tb