add tests

flake.nix

@@ -7,10 +7,17 @@
   }: let
     system = "x86_64-linux";
     pkgs = import nixpkgs {inherit system;};
-    tix = import ./testing/. {inherit pkgs;};
+    tix = import ./tix/. {inherit pkgs;};
   in
-    tix
-    // {
-      packages.x86_64-linux.test = tix.run [./mytest.nix];
+    tix // {
+      packages.x86_64-linux.test = tix.run [
+        ./test/it.test.nix
+        ./test/test.test.nix
+      ];
+      packages.x86_64-linux.example = tix.run [
+        ./mytest.nix
+      ];
+      packages.x86_64-linux.watch =
+        tix.watch "nix run .#test --show-trace | ${pkgs.fx}/bin/fx" "fx";
     };
 }

result

@@ -0,0 +1 @@
+/nix/store/xzz6wx11f5qsc34n1fw68cc6ba38wqrl-test

test/bad/string.nix

@@ -0,0 +1 @@
+"This isn't a test suite!"

test/it.test.nix

@@ -0,0 +1,11 @@
+{ it, ... }:
+[
+  (it "test's itself???" rec {
+    expected = {success = true; msg = "test's itself???";};
+    actual = 
+      (it "test's itself???" {
+        expected = expected;
+        actual = expected;
+      });
+  })
+]

test/run.test.nix

@@ -0,0 +1,12 @@
+{ it, ... }:
+let
+  pkgs = import <nixpkgs> {}; # impure ¯\_(ツ)_/¯
+  run = import ../tix/run.nix pkgs;
+  output = run [ ./it.test.nix ];
+in
+[
+  (it "makes a derivation called test" {
+    expected = "test";
+    actual = output.name;
+  })
+]

test/test.test.nix

@@ -0,0 +1,18 @@
+{ it, ... }:
+let
+  test = import ../tix/test.nix;
+in
+[
+  (it "get's test results" {
+    expected = [{"msg" = "test's itself???"; "success"= true;}];
+    actual = ( test ./it.test.nix ).results;
+  })
+  (it "has a path" {
+    actual = builtins.typeOf ( test ./it.test.nix ).path;
+    expected = "path";
+  })
+  (it "fails to build non test" {
+    actual = ( test ./bad/string.nix );
+    throws = true;
+  })
+]

testing/import.nix

@@ -1,7 +0,0 @@
-path: let
-  it = import ./it.nix;
-in
-  builtins.trace ("testing " + builtins.baseNameOf path) {
-    inherit path;
-    results = import path {inherit it;};
-  }

tix/default.nix

@@ -1,6 +1,6 @@
 {pkgs ? import <nixpkgs> {}}: {
   run = import ./run.nix pkgs;
   it = import ./it.nix;
-  import = import ./import.nix;
+  test = import ./test.nix;
   watch = import ./watch.nix pkgs;
 }

tix/run.nix

@@ -1,12 +1,12 @@
 pkgs: files: let
-  test = import ./import.nix;
+  test = import ./test.nix;
   res = map test files;
   resFile = builtins.toFile "results" (builtins.toJSON res);
   filter = ''
     .[] | {
       (.path): {
-      failures: [.results | map(select(.success==false))[] | {(.msg): {actual, expected}}],
-      success: .results | map(select(.success) | .msg) | length
+      "❌": [.results | map(select(.success==false))[] | {(.msg): {actual, expected}}],
+      "✔️": .results | map(select(.success) | .msg) | length
       }
     }
   '';

tix/test.nix

@@ -0,0 +1,14 @@
+path: let
+  it = import ./it.nix;
+  suite = import path;
+in
+  builtins.trace ("testing " + builtins.baseNameOf path)
+  (
+   if !builtins.isFunction suite
+     then throw "A test suite should be in the form { it }: [ <tests> ]."
+   else
+   {
+   inherit path;
+   results = suite {inherit it;};
+   }
+  )

tix/watch.nix

@@ -3,7 +3,7 @@ pkgs.writeShellScriptBin "watch" ''
   while true
   do
     ${cmd} &
-    ${pkgs.inotify-tools}/bin/inotifywait -e modify -r . --exclude .git
+    ${pkgs.inotify-tools}/bin/inotifywait -e modify -r .
     pkill ${pname}
   done
 ''