Handle multiple extras and invalid extras

src/poetry_plugin_export/command.py

@@ -82,9 +82,19 @@ def handle(self) -> None:
                 "</warning>"
             )
 
+        # Checking extras
+        extras = {
+            extra for extra_opt in self.option("extras") for extra in extra_opt.split()
+        }
+        invalid_extras = extras - self.poetry.package.extras.keys()
+        if invalid_extras:
+            raise ValueError(
+                f"Extra [{', '.join(sorted(invalid_extras))}] is not specified."
+            )
+
         exporter = Exporter(self.poetry)
         exporter.only_groups(list(self.activated_groups))
-        exporter.with_extras(self.option("extras"))
+        exporter.with_extras(list(extras))
         exporter.with_hashes(not self.option("without-hashes"))
         exporter.with_credentials(self.option("with-credentials"))
         exporter.with_urls(not self.option("without-urls"))

tests/command/test_command_export.py

@@ -50,6 +50,7 @@
 python = "~2.7 || ^3.6"
 foo = "^1.0"
 bar = { version = "^1.1", optional = true }
+qux = { version = "^1.2", optional = true }
 
 [tool.poetry.group.dev.dependencies]
 baz = "^2.0"
@@ -63,6 +64,7 @@
 
 [tool.poetry.extras]
 feature_bar = ["bar"]
+feature_qux = ["qux"]
 """
 
 
@@ -72,6 +74,7 @@ def setup(repo: Repository) -> None:
     repo.add_package(Package("bar", "1.1.0"))
     repo.add_package(Package("baz", "2.0.0"))
     repo.add_package(Package("opt", "2.2.0"))
+    repo.add_package(Package("qux", "1.2.0"))
 
 
 @pytest.fixture
@@ -174,15 +177,40 @@ def test_export_groups(
     assert tester.io.fetch_output() == expected
 
 
-def test_export_includes_extras_by_flag(tester: CommandTester, do_lock: None) -> None:
-    tester.execute("--format requirements.txt --extras feature_bar")
-    expected = f"""\
+@pytest.mark.parametrize(
+    "extras, expected",
+    [
+        (
+            "feature_bar",
+            f"""\
 bar==1.1.0 ; {MARKER_PY}
 foo==1.0.0 ; {MARKER_PY}
-"""
+""",
+        ),
+        (
+            "feature_bar feature_qux",
+            f"""\
+bar==1.1.0 ; {MARKER_PY}
+foo==1.0.0 ; {MARKER_PY}
+qux==1.2.0 ; {MARKER_PY}
+""",
+        ),
+    ],
+)
+def test_export_includes_extras_by_flag(
+    tester: CommandTester, do_lock: None, extras: str, expected: str
+) -> None:
+    tester.execute(f"--format requirements.txt --extras '{extras}'")
     assert tester.io.fetch_output() == expected
 
 
+def test_export_reports_invalid_extras(tester: CommandTester, do_lock: None) -> None:
+    with pytest.raises(ValueError) as error:
+        tester.execute("--format requirements.txt --extras 'SUS AMONGUS'")
+    expected = "Extra [AMONGUS, SUS] is not specified."
+    assert str(error.value) == expected
+
+
 def test_export_with_urls(
     monkeypatch: MonkeyPatch, tester: CommandTester, poetry: Poetry
 ) -> None: