fix lockfile with test command

conans/model/graph_lock.py

@@ -565,6 +565,8 @@ def check_locked_build_requires(self, node, package_build_requires, profile_buil
         if self._relaxed:
             return
         locked_node = node.graph_lock_node
+        if locked_node is None:
+            return
         locked_requires = locked_node.build_requires
         if not locked_requires:
             return

conans/test/integration/graph_lock/graph_lock_test.py

@@ -539,3 +539,21 @@ def set_version(self):
         client.run("lock create conanfile.py --lockfile-out=conan.lock")
         client.run("install . --lockfile=conan.lock")
         self.assertIn("conanfile.py (pkg/0.1): Installing package", client.out)
+
+
+def test_error_test_command():
+    # https://github.com/conan-io/conan/issues/9088
+    client = TestClient()
+    client.save({"dep/conanfile.py": GenConanfile(),
+                 "pkg/conanfile.py": GenConanfile().with_requires("dep/[>=1.0]"),
+                 "test_package/conanfile.py": GenConanfile().with_test("pass")})
+    client.run("create dep dep/1.0@")
+    client.run("create pkg pkg/1.0@")
+    client.run("lock create --ref=pkg/1.0@")
+    client.run("create dep dep/1.1@")
+    client.run("test test_package pkg/1.0@ --lockfile=conan.lock")
+    assert "dep/1.0" in client.out
+    assert "dep/1.1" not in client.out
+    client.run("test test_package pkg/1.0@")
+    assert "dep/1.0" not in client.out
+    assert "dep/1.1" in client.out