command: restore default behavior, consistent behavior for --with/--w…

…ithout, tests

src/poetry_plugin_export/command.py

@@ -41,6 +41,10 @@ class ExportCommand(InstallerCommand):
         option("with-credentials", None, "Include credentials for extra indices."),
     ]
 
+    @property
+    def non_optional_groups(self) -> set[str]:
+        return {"default"}
+
     def handle(self) -> None:
         fmt = self.option("format")
 

tests/command/test_command_export.py

@@ -50,6 +50,16 @@
 foo = "^1.0"
 bar = { version = "^1.1", optional = true }
 
+[tool.poetry.group.dev.dependencies]
+baz = "^2.0"
+
+[tool.poetry.group.opt]
+optional = true
+
+[tool.poetry.group.opt.dependencies]
+opt = "^2.2"
+
+
 [tool.poetry.extras]
 feature_bar = ["bar"]
 """
@@ -59,6 +69,8 @@
 def setup(repo: Repository) -> None:
     repo.add_package(Package("foo", "1.0.0"))
     repo.add_package(Package("bar", "1.1.0"))
+    repo.add_package(Package("baz", "2.0.0"))
+    repo.add_package(Package("opt", "2.2.0"))
 
 
 @pytest.fixture
@@ -129,6 +141,33 @@ def test_export_uses_requirements_txt_format_by_default(
     assert tester.io.fetch_output() == expected
 
 
+@pytest.mark.parametrize(
+    "options, expected",
+    [
+        ("", f"foo==1.0.0 ; {MARKER_PY}\n"),
+        ("--with dev", f"baz==2.0.0 ; {MARKER_PY}\nfoo==1.0.0 ; {MARKER_PY}\n"),
+        ("--with opt", f"foo==1.0.0 ; {MARKER_PY}\nopt==2.2.0 ; {MARKER_PY}\n"),
+        (
+            "--with dev,opt",
+            f"baz==2.0.0 ; {MARKER_PY}\nfoo==1.0.0 ; {MARKER_PY}\nopt==2.2.0 ;"
+            f" {MARKER_PY}\n",
+        ),
+        ("--without default", "\n"),
+        ("--without dev", f"foo==1.0.0 ; {MARKER_PY}\n"),
+        ("--without opt", f"foo==1.0.0 ; {MARKER_PY}\n"),
+        ("--without default,dev,opt", "\n"),
+        ("--only default", f"foo==1.0.0 ; {MARKER_PY}\n"),
+        ("--only dev", f"baz==2.0.0 ; {MARKER_PY}\n"),
+        ("--only default,dev", f"baz==2.0.0 ; {MARKER_PY}\nfoo==1.0.0 ; {MARKER_PY}\n"),
+    ],
+)
+def test_export_groups(
+    tester: CommandTester, do_lock: None, options: str, expected: str
+):
+    tester.execute(options)
+    assert tester.io.fetch_output() == expected
+
+
 def test_export_includes_extras_by_flag(tester: CommandTester, do_lock: None):
     tester.execute("--format requirements.txt --extras feature_bar")
     expected = f"""\