diff --git a/tests/fixtures/linux/linux.json b/tests/fixtures/linux/linux.json
index ad285084e..062dec3cc 100644
--- a/tests/fixtures/linux/linux.json
+++ b/tests/fixtures/linux/linux.json
@@ -367,6 +367,23 @@
             }
           },
           "state": "Uncompleted"
+        },
+        "setup_channels": {
+          "action": {
+            "create_file": {
+              "action": {
+                "path": "/root/.nix-channels",
+                "user": null,
+                "group": null,
+                "mode": 436,
+                "buf": "https://nixos.org/channels/nixpkgs-unstable nixpkgs\n",
+                "force": false
+              },
+              "state": "Uncompleted"
+            },
+            "unpacked_path": "/nix/temp-install-dir"
+          },
+          "state": "Uncompleted"
         }
       },
       "state": "Uncompleted"
@@ -416,6 +433,7 @@
       "ssl_cert_file": null,
       "extra_conf": [],
       "force": false,
+      "add_channel": true,
       "diagnostic_endpoint": "https://install.determinate.systems/nix/diagnostic"
     },
     "init": {
@@ -435,4 +453,4 @@
     "ssl_cert_file": null,
     "failure_chain": null
   }
-}
\ No newline at end of file
+}
diff --git a/tests/fixtures/linux/steam-deck.json b/tests/fixtures/linux/steam-deck.json
index 0610ff0be..a05aefb9e 100644
--- a/tests/fixtures/linux/steam-deck.json
+++ b/tests/fixtures/linux/steam-deck.json
@@ -354,6 +354,23 @@
             }
           },
           "state": "Uncompleted"
+        },
+        "setup_channels": {
+          "action": {
+            "create_file": {
+              "action": {
+                "path": "/root/.nix-channels",
+                "user": null,
+                "group": null,
+                "mode": 436,
+                "buf": "https://nixos.org/channels/nixpkgs-unstable nixpkgs\n",
+                "force": false
+              },
+              "state": "Uncompleted"
+            },
+            "unpacked_path": "/nix/temp-install-dir"
+          },
+          "state": "Uncompleted"
         }
       },
       "state": "Uncompleted"
@@ -400,6 +417,7 @@
       "ssl_cert_file": null,
       "extra_conf": [],
       "force": false,
+      "add_channel": true,
       "diagnostic_endpoint": "https://install.determinate.systems/nix/diagnostic"
     }
   },
@@ -415,4 +433,4 @@
     "ssl_cert_file": null,
     "failure_chain": null
   }
-}
\ No newline at end of file
+}
diff --git a/tests/fixtures/macos/macos.json b/tests/fixtures/macos/macos.json
index 3ce5d7e05..e45889102 100644
--- a/tests/fixtures/macos/macos.json
+++ b/tests/fixtures/macos/macos.json
@@ -390,6 +390,23 @@
             }
           },
           "state": "Uncompleted"
+        },
+        "setup_channels": {
+          "action": {
+            "create_file": {
+              "action": {
+                "path": "/var/root/.nix-channels",
+                "user": null,
+                "group": null,
+                "mode": 436,
+                "buf": "https://nixos.org/channels/nixpkgs-unstable nixpkgs\n",
+                "force": false
+              },
+              "state": "Uncompleted"
+            },
+            "unpacked_path": "/nix/temp-install-dir"
+          },
+          "state": "Uncompleted"
         }
       },
       "state": "Uncompleted"
@@ -427,6 +444,7 @@
       "ssl_cert_file": null,
       "extra_conf": [],
       "force": false,
+      "add_channel": true,
       "diagnostic_endpoint": "https://install.determinate.systems/nix/diagnostic"
     },
     "encrypt": null,
@@ -446,4 +464,4 @@
     "ssl_cert_file": null,
     "failure_chain": null
   }
-}
\ No newline at end of file
+}
diff --git a/tests/plan.rs b/tests/plan.rs
index a962d8c5e..e34ad0f75 100644
--- a/tests/plan.rs
+++ b/tests/plan.rs
@@ -10,7 +10,6 @@ const MACOS: &str = include_str!("./fixtures/macos/macos.json");
 // Ensure existing plans still parse
 // If this breaks and you need to update the fixture, disable these tests, bump `nix_installer` to a new version, and update the plans.
 #[cfg(target_os = "linux")]
-#[ignore]
 #[test]
 fn plan_compat_linux() -> eyre::Result<()> {
     let _: InstallPlan = serde_json::from_str(LINUX)?;
@@ -20,7 +19,6 @@ fn plan_compat_linux() -> eyre::Result<()> {
 // Ensure existing plans still parse
 // If this breaks and you need to update the fixture, disable these tests, bump `nix_installer` to a new version, and update the plans.
 #[cfg(target_os = "linux")]
-#[ignore]
 #[test]
 fn plan_compat_steam_deck() -> eyre::Result<()> {
     let _: InstallPlan = serde_json::from_str(STEAM_DECK)?;
@@ -30,7 +28,6 @@ fn plan_compat_steam_deck() -> eyre::Result<()> {
 // Ensure existing plans still parse
 // If this breaks and you need to update the fixture, disable these tests, bump `nix_installer` to a new version, and update the plans.
 #[cfg(target_os = "macos")]
-#[ignore]
 #[test]
 fn plan_compat_macos() -> eyre::Result<()> {
     let _: InstallPlan = serde_json::from_str(MACOS)?;