diff --git a/lib/testHelpers.nix b/lib/testHelpers.nix
index c29618d..0edb595 100644
--- a/lib/testHelpers.nix
+++ b/lib/testHelpers.nix
@@ -2,4 +2,6 @@
   path = pkgs: "export PATH=${lib.makeBinPath pkgs}";
   pathAdd = pkgs: "export PATH=$PATH:${lib.makeBinPath pkgs}";
   scriptHelpers = builtins.readFile ./scriptHelpers.sh;
+  toJsonFile = any: builtins.toFile "actual" (builtins.toJSON any);
+  toPrettyFile = any: builtins.toFile "actual" (lib.generators.toPretty {} any);
 }
diff --git a/tests/lib_test.nix b/tests/lib_test.nix
index bf21649..4437cf3 100644
--- a/tests/lib_test.nix
+++ b/tests/lib_test.nix
@@ -1,86 +1,90 @@
 {
-  lib,
   pkgs,
   ntlib,
   ...
 }: {
-  suites."Lib Tests".tests = [
-    {
-      name = "autodiscovery";
-      type = "script";
-      script = let
-        actual = builtins.toFile "actual" (builtins.toJSON (ntlib.autodiscover {
-          dir = ./fixtures;
-        }));
-      in
-        # sh
-        ''
-          ${ntlib.helpers.path [pkgs.gnugrep]}
-          ${ntlib.helpers.scriptHelpers}
-          assert_file_contains ${actual} "sample_test.nix" "should find sample_test.nix"
-          assert_file_contains ${actual} "\"base\":\"/nix/store/.*-source/tests/fixtures" "should set base to fixtures dir"
-        '';
-    }
-    {
-      name = "binary";
-      type = "script";
-      script = let
-        binary =
-          (ntlib.mkBinary {
-            nixtests = "stub";
-            extraParams = "--pure";
-          })
-          + "/bin/nixtests:run";
-      in
-        # sh
-        ''
-          ${ntlib.helpers.path [pkgs.gnugrep]}
-          ${ntlib.helpers.scriptHelpers}
-          assert_file_contains ${binary} "nixtest" "should contain nixtest"
-          assert_file_contains ${binary} "--pure" "should contain --pure arg"
-          assert_file_contains ${binary} "--tests=stub" "should contain --tests arg"
+  suites."Lib Tests" = {
+    pos = __curPos;
+    tests = [
+      {
+        name = "autodiscovery";
+        type = "script";
+        script = let
+          actual = ntlib.helpers.toPrettyFile (ntlib.autodiscover {
+            dir = ./fixtures;
+          });
+        in
+          # sh
+          ''
+            ${ntlib.helpers.path [pkgs.gnugrep]}
+            ${ntlib.helpers.scriptHelpers}
+            assert_file_contains ${actual} "sample_test.nix" "should find sample_test.nix"
+            assert_file_contains ${actual} "base = \"/nix/store/.*-source/tests/fixtures/\"" "should set base to fixtures dir"
+          '';
+      }
+      {
+        name = "binary";
+        type = "script";
+        script = let
+          binary =
+            (ntlib.mkBinary {
+              nixtests = "stub";
+              extraParams = "--pure";
+            })
+            + "/bin/nixtests:run";
+        in
+          # sh
+          ''
+            ${ntlib.helpers.path [pkgs.gnugrep]}
+            ${ntlib.helpers.scriptHelpers}
+            assert_file_contains ${binary} "nixtest" "should contain nixtest"
+            assert_file_contains ${binary} "--pure" "should contain --pure arg"
+            assert_file_contains ${binary} "--tests=stub" "should contain --tests arg"
 
-          run "${binary} --help"
-          assert_eq $exit_code 0 "should exit 0"
-          assert_contains "$output" "Usage of nixtest" "should show help"
+            run "${binary} --help"
+            assert_eq $exit_code 0 "should exit 0"
+            assert_contains "$output" "Usage of nixtest" "should show help"
 
-          run "${binary}"
-          assert_eq $exit_code 1 "should exit 1"
-          assert_contains "$output" "Tests file does not exist"
-        '';
-    }
-    {
-      name = "full run with fixtures";
-      type = "script";
-      script = let
-        binary =
-          (ntlib.mkNixtest {
-            modules = ntlib.autodiscover {dir = ./fixtures;};
-            args = {inherit pkgs;};
-          })
-          + "/bin/nixtests:run";
-      in
-        # sh
-        ''
-          ${ntlib.helpers.path [pkgs.gnugrep pkgs.mktemp]}
-          ${ntlib.helpers.scriptHelpers}
+            run "${binary}"
+            assert_eq $exit_code 1 "should exit 1"
+            assert_contains "$output" "Tests file does not exist"
+          '';
+      }
+      {
+        name = "full run with fixtures";
+        type = "script";
+        script = let
+          binary =
+            (ntlib.mkNixtest {
+              modules = ntlib.autodiscover {dir = ./fixtures;};
+              args = {inherit pkgs;};
+            })
+            + "/bin/nixtests:run";
+        in
+          # sh
+          ''
+            ${ntlib.helpers.path [pkgs.gnugrep pkgs.mktemp]}
+            ${ntlib.helpers.scriptHelpers}
 
-          TMPDIR=$(tmpdir)
-          run "${binary} --pure --junit=$TMPDIR/junit.xml"
-          assert "$exit_code -eq 2" "should exit 2"
-          assert "-f $TMPDIR/junit.xml" "should create junit.xml"
-          assert_contains "$output" "executable file not found" "nix should not be found in pure mode"
+            TMPDIR=$(tmpdir)
+            # start without nix & env binaries to expect errors
+            run "${binary} --pure --junit=$TMPDIR/junit.xml"
+            assert "$exit_code -eq 2" "should exit 2"
+            assert "-f $TMPDIR/junit.xml" "should create junit.xml"
+            assert_contains "$output" "executable file not found" "nix should not be found in pure mode"
 
-          ${ntlib.helpers.pathAdd [pkgs.nix pkgs.coreutils]}
-          run "${binary} --pure --junit=$TMPDIR/junit2.xml"
-          assert "$exit_code -eq 2" "should exit 2"
-          assert "-f $TMPDIR/junit2.xml" "should create junit2.xml"
-          assert_not_contains "$output" "executable file not found" "nix should now exist"
-          assert_contains "$output" "suite-one" "should contain suite-one"
-          assert_contains "$output" "8/11 (1 SKIPPED)" "should be 8/11 total"
-          assert_contains "$output" "ERROR" "should contain an error"
-          assert_contains "$output" "SKIP" "should contain a skip"
-        '';
-    }
-  ];
+            # now add required deps
+            ${ntlib.helpers.pathAdd [pkgs.nix pkgs.coreutils]}
+            run "${binary} --pure --junit=$TMPDIR/junit2.xml"
+            assert "$exit_code -eq 2" "should exit 2"
+            assert "-f $TMPDIR/junit2.xml" "should create junit2.xml"
+            assert_not_contains "$output" "executable file not found" "nix should now exist"
+            assert_contains "$output" "suite-one" "should contain suite-one"
+            assert_contains "$output" "8/11 (1 SKIPPED)" "should be 8/11 total"
+            assert_contains "$output" "ERROR" "should contain an error"
+            assert_contains "$output" "SKIP" "should contain a skip"
+          '';
+      }
+    ];
+  };
 }