diff --git a/.editorconfig b/.editorconfig
index aab3429..061699c 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -11,5 +11,5 @@ indent_style = space
 indent_size = 4
 
 [*.nix]
-indent_style = tab
+indent_style = space
 indent_size = 2
diff --git a/default.nix b/default.nix
index b17a6c7..4372c35 100644
--- a/default.nix
+++ b/default.nix
@@ -5,7 +5,8 @@
 	in import src { inherit pkgs; },
 }: let
 	inherit (qpkgs) lib;
-	dynix = qpkgs.callPackage ./package.nix { };
+	dynix = qpkgs.callPackage ./package.nix { }
+	|> qpkgs.stdlib.mkStdenvPretty;
 	byStdenv = lib.mapAttrs (stdenvName: stdenv: let
 		withStdenv = dynix.override { inherit stdenv; };
 		dynix' = withStdenv.overrideAttrs (prev: {
diff --git a/package.nix b/package.nix
index d29908a..3d0e673 100644
--- a/package.nix
+++ b/package.nix
@@ -2,9 +2,12 @@
 	lib,
 	stdenvNoCC,
 	callPackage,
+	linkFarm,
 }: let
 	stdenv = stdenvNoCC;
-in stdenv.mkDerivation (self: {
+in stdenv.mkDerivation (finalAttrs: let
+	self = finalAttrs.finalPackage;
+in {
 	name = "dynix-modules";
 
 	strictDeps = true;
@@ -21,12 +24,15 @@ in stdenv.mkDerivation (self: {
 
 	phases = [ "unpackPhase" "patchPhase" "installPhase" ];
 
+	modulesOut = "${placeholder "modules"}/share/nixos/modules/dynix";
+
 	installPhase = lib.dedent ''
+		runHook preInstall
 		mkdir -p "$out"
 		cp -r * "$out/"
 
 		mkdir -p "$modules/share/nixos/modules/dynix"
-		cp --reflink=auto -r "$out/"* "$modules/share/nixos/modules/dynix/"
+		cp --reflink=auto -r "$out/"* "$modulesOut/"
 	'';
 
 	passthru.mkDevShell = {
@@ -39,7 +45,7 @@ in stdenv.mkDerivation (self: {
 			p.beartype
 		]);
 	in mkShell' {
-		name = "devshell-for-${self.finalPackage.name}";
+		name = "devshell-for-${self.name}";
 		packages = [ pyEnv ];
 		env.PYTHONPATH = [
 			"${pyEnv}/${pyEnv.sitePackages}"
@@ -48,13 +54,19 @@ in stdenv.mkDerivation (self: {
 		] |> lib.concatStringsSep ":";
 	};
 
-	passthru.modulesPath = self.finalPackage.modules + "/share/nixos/modules";
+	passthru.modulesPath = self.modules + "/share/nixos/modules";
 
 	passthru.tests = lib.fix (callPackage ./tests {
-		dynix = self.finalPackage;
+		dynix = self;
 	}).packages;
 
+	passthru.allTests = linkFarm "dynix-all-tests" self.tests;
+
 	meta = {
+		longDescription = lib.dedent ''
+			Default output contains the modules at top-level, meant for `import`.
+			The `modules` output contains the modules prefixed under `/share/nixos/modules/dynix`.
+		'';
 		outputsToInstall = [ "modules" ];
 	};
 })
diff --git a/tests/default.nix b/tests/default.nix
index 5e3d082..dc690a6 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -3,23 +3,35 @@
   qpkgs ? let
     src = fetchTree (builtins.parseFlakeRef "github:Qyriad/nur-packages");
   in import src { inherit pkgs; },
+  callPackage ? qpkgs.callPackage,
   lib ? qpkgs.lib,
   dynix ? qpkgs.callPackage ../package.nix { },
 }: let
 
+  mkDynixConfigurationDotNix = callPackage ./mk-test-configuration-dot-nix.nix { };
+
   runDynixTest = testModule: pkgs.testers.runNixOSTest {
     imports = [ testModule ];
 
+    # NOTE: these are arguments to each *test module*.
+    # Not the NixOS modules of the test's nodes.
+    _module.args = { inherit mkDynixConfigurationDotNix; };
+
     # Why is this argument called "extraBaseModule**s**" but take a single module argument...
     # Also note this is an extra base module for each node of the test,
     # not an extra test module.
     extraBaseModules = { name, config, options, modulesPath, ... }: {
+      /**
+       * Everything in this module will disappear once nixos-rebuild switch happens.
+       * So each test will need to use `mkDynixConfigurationDotNix` to get
+       * ./dynix-vm-configuration included in the in-VM configuration.
+       */
+
       imports = (import "${modulesPath}/module-list.nix") ++ [
         ./module-allow-rebuild-in-vm.nix
-        "${modulesPath}/testing/test-instrumentation.nix"
+        ./dynix-vm-configuration.nix
         (toString dynix)
       ];
-      environment.systemPackages = [ dynix ];
 
       systemd.services."install-dynix" = {
         enable = true;
@@ -27,9 +39,18 @@
         serviceConfig.RemainAfterExit = true;
         path = [ config.system.path ];
         wantedBy = [ "multi-user.target" ];
+        serviceConfig.requisteOf = [ "multi-user.target" ];
         after = [ "default.target" ];
         script = ''
-          nix profile install -vv "$(realpath /run/current-system/sw/share/nixos/modules/dynix/)"
+          nix profile install -vv "${dynix.modules}"
+
+          mkdir -vp /etc/nixos
+          nixos-generate-config
+          cp -rv --dereference /run/current-system/sw/share/nixos/*.nix /etc/nixos/
+          if ! [[ -e /etc/nixos/dynix-vm-configuration.nix ]]; then
+            echo "FAILURE"
+            echo "FAILURE" >&2
+          fi
         '';
       };
 
diff --git a/tests/dynix-vm-configuration.nix b/tests/dynix-vm-configuration.nix
new file mode 100644
index 0000000..fbc6193
--- /dev/null
+++ b/tests/dynix-vm-configuration.nix
@@ -0,0 +1,59 @@
+{ pkgs, lib, modulesPath, ... }:
+let
+  moduleList = import "${modulesPath}/module-list.nix";
+
+  dynixFromSearchPath = let
+    res = builtins.tryEval <dynix>;
+  in lib.optional res.success res.value;
+in
+{
+  imports = [
+    "${modulesPath}/testing/test-instrumentation.nix"
+  ] ++ lib.concatLists [
+    dynixFromSearchPath
+    moduleList
+  ];
+
+  system.switch.enable = true;
+  system.includeBuildDependencies = true;
+  documentation.enable = false;
+
+  boot.loader.grub = {
+    enable = true;
+    device = "/dev/vda";
+    forceInstall = true;
+  };
+
+  nix = {
+    package = pkgs.lixPackageSets.latest.lix;
+    nixPath = [
+      "nixpkgs=${pkgs.path}"
+      "/nix/var/nix/profiles/per-user/root/profile/share/nixos/modules"
+    ];
+
+    settings = {
+      experimental-features = [ "nix-command" "pipe-operator" ];
+      substituters = lib.mkForce [ ];
+      hashed-mirrors = null;
+      connect-timeout = 1;
+      # For my debugging purposes.
+      show-trace = true;
+    };
+  };
+
+  environment.pathsToLink = [ "/share" ];
+  environment.extraOutputsToInstall = [ "modules" ];
+  environment.variables = {
+    "NIXOS_CONFIG" = "/etc/nixos/configuration.nix";
+  };
+
+  environment.shellAliases = {
+    ls = "eza --long --header --group --group-directories-first --classify --binary";
+  };
+
+  environment.systemPackages = with pkgs; [
+    eza
+    fd
+    ripgrep
+  ];
+}
diff --git a/tests/gotosocial/configuration.nix b/tests/gotosocial/configuration.nix
index deef056..8ada5c8 100644
--- a/tests/gotosocial/configuration.nix
+++ b/tests/gotosocial/configuration.nix
@@ -1,48 +1,9 @@
 { pkgs, lib, config, modulesPath, ... }:
 let
   name = config.networking.hostName;
-  moduleList = import (modulesPath + "/module-list.nix");
-
-  dynixFromSearchPath = let
-    res = builtins.tryEval <dynix>;
-  in lib.optional res.success res.value;
 in
 {
-  imports = moduleList ++ [
-    "${modulesPath}/testing/test-instrumentation.nix"
-    ./hardware-configuration.nix
-  ] ++ lib.concatLists [
-    dynixFromSearchPath
-  ];
-
-  system.switch.enable = true;
-  documentation.enable = false;
-
   networking.hostName = "gotosocial-machine";
-
-  boot.loader.grub = {
-    enable = true;
-    device = "/dev/vda";
-    forceInstall = true;
-  };
-
-  nix = {
-    package = pkgs.lixPackageSets.latest.lix;
-    nixPath = [
-      "nixpkgs=${pkgs.path}"
-      "/nix/var/nix/profiles/per-user/root/profile/share/nixos/modules"
-    ];
-
-    settings = {
-      experimental-features = [ "nix-command" "pipe-operator" ];
-      substituters = lib.mkForce [ ];
-      hashed-mirrors = null;
-      connect-timeout = 1;
-      # For my debugging purposes.
-      show-trace = true;
-    };
-  };
-
   services.gotosocial = {
     enable = true;
     setupPostgresqlDB = true;
@@ -53,19 +14,4 @@ in
   };
 
   dynamicism.for.gotosocial.enable = true;
-
-  environment.pathsToLink = [ "/share" ];
-  environment.extraOutputsToInstall = [ "modules" ];
-  environment.variables = {
-    "NIXOS_CONFIG" = "/etc/nixos/configuration.nix";
-  };
-
-  environment.shellAliases = {
-    ls = "eza --long --header --group --group-directories-first --classify --binary";
-  };
-  environment.systemPackages = with pkgs; [
-    eza
-    fd
-    ripgrep
-  ];
 }
diff --git a/tests/gotosocial/test-script.py b/tests/gotosocial/test-script.py
index d8b2af8..2fa42ed 100644
--- a/tests/gotosocial/test-script.py
+++ b/tests/gotosocial/test-script.py
@@ -52,12 +52,6 @@ def get_config_file() -> str:
 machine.wait_for_unit("default.target")
 assert "lix" in machine.succeed("nix --version").lower()
 machine.log("INIT")
-run_log(machine, "journalctl --no-pager -eu install-dynix.service")
-
-machine.succeed("nixos-generate-config")
-machine.succeed("mkdir -vp /etc/nixos")
-# Dereference is required since that configuration.nix is probably a symlink to the store.
-machine.succeed("cp -rv --dereference /run/current-system/sw/share/nixos/configuration.nix /etc/nixos/")
 
 machine.log("REBUILDING configuration inside VM")
 machine.succeed("env PAGER= nixos-rebuild switch --log-format raw-with-logs --fallback")
diff --git a/tests/gotosocial/test.nix b/tests/gotosocial/test.nix
index 9628b93..fd5bfbb 100644
--- a/tests/gotosocial/test.nix
+++ b/tests/gotosocial/test.nix
@@ -1,4 +1,4 @@
-{ ... }:
+{ mkDynixConfigurationDotNix, config, ... }:
 
 {
   name = "nixos-test-dynamicism-gotosocial";
@@ -17,7 +17,10 @@
     imports = [ ./configuration.nix ];
 
     environment.systemPackages = let
-      configFileTree = pkgs.callPackage ./configuration-package.nix { };
+      configFileTree = mkDynixConfigurationDotNix {
+        inherit (config) name;
+        configuration = ./configuration.nix;
+      };
     in [
       configFileTree
     ];
diff --git a/tests/harmonia/configuration.nix b/tests/harmonia/configuration.nix
index 7bf19bb..37494cb 100644
--- a/tests/harmonia/configuration.nix
+++ b/tests/harmonia/configuration.nix
@@ -1,4 +1,4 @@
-{ pkgs, lib, config, modulesPath, ... }:
+{ lib, modulesPath, ... }:
 let
   moduleList = import "${modulesPath}/module-list.nix";
 
@@ -8,10 +8,10 @@ let
 in
 {
   imports = [
-    "${modulesPath}/testing/test-instrumentation.nix"
-    ./hardware-configuration.nix
+    #"${modulesPath}/testing/test-instrumentation.nix"
+    #./hardware-configuration.nix
   ] ++ lib.concatLists [
-    dynixFromSearchPath
+    #dynixFromSearchPath
     moduleList
   ];
 
@@ -26,47 +26,5 @@ in
     };
   };
 
-  system.switch.enable = true;
-  documentation.enable = false;
-
   networking.hostName = "harmonia-machine";
-
-  boot.loader.grub = {
-    enable = true;
-    device = "/dev/vda";
-    forceInstall = true;
-  };
-
-  nix = {
-    package = pkgs.lixPackageSets.latest.lix;
-    nixPath = [
-      "nixpkgs=${pkgs.path}"
-      "/nix/var/nix/profiles/per-user/root/profile/share/nixos/modules"
-    ];
-
-    settings = {
-      experimental-features = [ "nix-command" "pipe-operator" ];
-      substituters = lib.mkForce [ ];
-      hashed-mirrors = null;
-      connect-timeout = 1;
-      # For my debugging purposes.
-      show-trace = true;
-    };
-  };
-
-  environment.pathsToLink = [ "/share" ];
-  environment.extraOutputsToInstall = [ "modules" ];
-  environment.variables = {
-    "NIXOS_CONFIG" = "/etc/nixos/configuration.nix";
-  };
-
-  environment.shellAliases = {
-    ls = "eza --long --header --group --group-directories-first --classify --binary";
-  };
-
-  environment.systemPackages = with pkgs; [
-    eza
-    fd
-    ripgrep
-  ];
 }
diff --git a/tests/harmonia/test-script.py b/tests/harmonia/test-script.py
index a91bf78..e96a053 100644
--- a/tests/harmonia/test-script.py
+++ b/tests/harmonia/test-script.py
@@ -66,10 +66,6 @@ assert int(config_toml['workers']) == 4, f"{config_toml['workers']=} != 4"
 assert int(config_toml['max_connection_rate']) == 256, f"{config_toml['max_connection_rate']=} != 256"
 
 with machine.nested("must succeed: initial nixos-rebuild switch"):
-    machine.succeed("nixos-generate-config")
-    machine.succeed("mkdir -vp /etc/nixos")
-    # Dereference is required since that configuration.nix is probably a symlink to the store.
-    machine.succeed("cp -rv --dereference /run/current-system/sw/share/nixos/configuration.nix /etc/nixos/")
     machine.succeed("env PAGER= nixos-rebuild switch --log-format raw-with-logs --fallback")
 
 # Config should not have changed.
diff --git a/tests/harmonia/test.nix b/tests/harmonia/test.nix
index 0aea418..873c7dd 100644
--- a/tests/harmonia/test.nix
+++ b/tests/harmonia/test.nix
@@ -1,4 +1,4 @@
-{ ... }:
+{ mkDynixConfigurationDotNix, config, ... }:
 {
   name = "nixos-test-dynamicism-harmonia";
 
@@ -10,10 +10,14 @@
     imports = [ ./configuration.nix ];
 
     environment.systemPackages = let
-      configFileTree = pkgs.runCommand "${name}-configuration-dot-nix" { } ''
-        set -euo pipefail
-        install -Dm a=r ${./configuration.nix} "$out/share/nixos/configuration.nix"
-      '';
+      #configFileTree = pkgs.runCommand "${name}-configuration-dot-nix" { } ''
+      #  set -euo pipefail
+      #  install -Dm a=r ${./configuration.nix} "$out/share/nixos/configuration.nix"
+      #'';
+      configFileTree = mkDynixConfigurationDotNix {
+        inherit (config) name;
+        configuration = ./configuration.nix;
+      };
     in [
       configFileTree
     ];
diff --git a/tests/mk-test-configuration-dot-nix.nix b/tests/mk-test-configuration-dot-nix.nix
new file mode 100644
index 0000000..a31cf50
--- /dev/null
+++ b/tests/mk-test-configuration-dot-nix.nix
@@ -0,0 +1,63 @@
+{
+  lib,
+  stdenvNoCC,
+}: let
+  stdenv = stdenvNoCC;
+
+  mkDynixConfigurationDotNix = finalAttrs: {
+    name,
+    configuration,
+  }: assert lib.isStringLike configuration; let
+    self = finalAttrs.finalPackage;
+  in {
+    name = "configuration-dot-nix-for-${name}";
+    strictDeps = true;
+    __structuredAttrs = true;
+    preferLocalBuild = true;
+
+    phases = [ "installPhase" ];
+
+    #outputs = [ "out" "modules" ];
+    outputs = [ "out" ];
+    modulesOut = "${placeholder "out"}/share/nixos";
+    #modulesOut = "${placeholder "modules"}/share/nixos/modules";
+
+    baseConfiguration = configuration;
+
+    installPhase = ''
+      runHook preInstall
+
+      install -Dm a=r "$baseConfiguration" "$modulesOut/test-configuration.nix"
+      install -Dm a=r "${./dynix-vm-configuration.nix}" "$modulesOut/dynix-vm-configuration.nix"
+
+      echo "/** GENERATED BY mk-test-configuration-dot-nix! */" >> "$modulesOut/configuration.nix"
+      echo "{ ... }:" >> "$modulesOut/configuration.nix"
+      echo >> "$modulesOut/configuration.nix"
+      echo >> "$modulesOut/configuration.nix"
+      echo "{" >> "$modulesOut/configuration.nix"
+      echo "  imports = [" >> "$modulesOut/configuration.nix"
+      echo "    ./test-configuration.nix" >> "$modulesOut/configuration.nix"
+      echo "    ./dynix-vm-configuration.nix" >> "$modulesOut/configuration.nix"
+      echo "    ./hardware-configuration.nix" >> "$modulesOut/configuration.nix"
+      echo "  ];" >> "$modulesOut/configuration.nix"
+      echo "}" >> "$modulesOut/configuration.nix"
+
+      #mkdir -p "$out"
+      #cp -r --reflink=auto "$modulesOut/"* "$out/"
+
+      runHook postInstall
+    '';
+
+    passthru = {
+      modulesPath = self.out + "/share/nixos";
+      configuration = self.out + "/share/nixos/configuration.nix";
+    };
+
+    meta = {
+      #outputsToInstall = [ "modules" ];
+    };
+  };
+in lib.extendMkDerivation {
+  constructDrv = stdenv.mkDerivation;
+  extendDrvArgs = mkDynixConfigurationDotNix;
+}