Add simple test runner

Tests mostly imported from Alejandra

flake.nix

@@ -84,6 +84,7 @@
               # nixfmt: expand
               cabal-install
               stylish-haskell
+              shellcheck
             ]);
           });
 

test/README.md

@@ -10,5 +10,7 @@ the input.
 
 Tests in `invalid` should return an error when formatted.
 
-Tests in `changed` have input and output files. `nixfmt --verify foo.in.nix`
+Tests in `diff` have input and output files. `nixfmt --verify < foo.in.nix`
 should output exactly `foo.out.nix`.
+
+`test.sh` runs these tests for you. Pass `--update-diff` to update the out files in `diff`.

test/diff/apply/in.nix

@@ -0,0 +1,100 @@
+[
+  (a
+  b)
+  (
+    (a  b)
+    (a b)
+    (a /*b*/ c)
+    (/*a*/ b /*c*/ d /*e*/)
+  )
+  ''
+    otherModules=${
+      pkgs.writeText "other-modules.json"
+      (l.toJSON
+        (l.mapAttrs
+          (pname: subOutputs:
+            let
+              pkg = subOutputs.packages."${pname}".overrideAttrs (old: {
+                buildScript = "true";
+                installMethod = "copy";
+              });
+            in
+              "${pkg}/lib/node_modules/${pname}/node_modules")
+          outputs.subPackages))
+    }
+  ''
+  {
+    name1 =
+      function
+        arg
+        {asdf = 1;};
+
+    name2 =
+      function
+        arg
+        {asdf = 1;}
+        argument;
+
+    name3 =
+      function
+        arg
+        {asdf = 1;}
+        {qwer = 12345;}
+        argument;
+  }
+  {
+    name1 = function arg {
+      asdf = 1;
+    };
+
+    name2 = function arg {
+        asdf = 1;
+      }
+      argument;
+
+    name3 = function arg {
+        asdf = 1;
+      } {
+        qwer = 12345;
+      }
+      argument;
+  }
+  {
+    name4 =
+      function
+        arg
+        {asdf = 1;}
+        {
+          qwer = 12345;
+          qwer2 = 54321;
+        }
+        argument;
+  }
+  {
+    option1 = function arg {asdf = 1;} {
+      qwer = 12345;
+      qwer2 = 54321;
+    }
+    lastArg;
+
+    option2 = function arg {asdf = 1;} {
+        qwer = 12345;
+        qwer2 = 54321;
+      }
+      lastArg;
+
+    option3 = function arg {asdf = 1;}
+      {
+        qwer = 12345;
+        qwer2 = 54321;
+      }
+      lastArg;
+  }
+  # https://github.com/kamadorueda/alejandra/issues/372#issuecomment-1435083516
+  {
+    outputs =
+      { utils }:
+      # For each supported platform,
+      utils.lib.eachDefaultSystem (system: {});
+  }
+]

test/diff/apply/out.nix

@@ -0,0 +1,63 @@
+[
+  (a b)
+  ((a b) (a b) (a # b
+    c) ( # a
+      b # c
+      d # e
+    ))
+  ''
+    otherModules=${
+      pkgs.writeText "other-modules.json" (l.toJSON (l.mapAttrs
+        (pname: subOutputs:
+          let
+            pkg = subOutputs.packages."${pname}".overrideAttrs (old: {
+              buildScript = "true";
+              installMethod = "copy";
+            });
+          in "${pkg}/lib/node_modules/${pname}/node_modules")
+        outputs.subPackages))
+    }
+  ''
+  {
+    name1 = function arg { asdf = 1; };
+
+    name2 = function arg { asdf = 1; } argument;
+
+    name3 = function arg { asdf = 1; } { qwer = 12345; } argument;
+  }
+  {
+    name1 = function arg { asdf = 1; };
+
+    name2 = function arg { asdf = 1; } argument;
+
+    name3 = function arg { asdf = 1; } { qwer = 12345; } argument;
+  }
+  {
+    name4 = function arg { asdf = 1; } {
+      qwer = 12345;
+      qwer2 = 54321;
+    } argument;
+  }
+  {
+    option1 = function arg { asdf = 1; } {
+      qwer = 12345;
+      qwer2 = 54321;
+    } lastArg;
+
+    option2 = function arg { asdf = 1; } {
+      qwer = 12345;
+      qwer2 = 54321;
+    } lastArg;
+
+    option3 = function arg { asdf = 1; } {
+      qwer = 12345;
+      qwer2 = 54321;
+    } lastArg;
+  }
+  # https://github.com/kamadorueda/alejandra/issues/372#issuecomment-1435083516
+  {
+    outputs = { utils }:
+      # For each supported platform,
+      utils.lib.eachDefaultSystem (system: { });
+  }
+]

test/diff/assert/in.nix

@@ -0,0 +1,13 @@
+[
+  (assert       b      ;       e)
+  (assert       b      ; /*d*/ e)
+  (assert       b /*c*/;       e)
+  (assert       b /*c*/; /*d*/ e)
+  (assert /*a*/ b      ;       e)
+  (assert /*a*/ b      ; /*d*/ e)
+  (assert /*a*/ b /*c*/;       e)
+  (assert /*a*/ b /*c*/; /*d*/ e)
+  ( assert b; cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc )
+  ( assert b;
+  cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc )
+]

test/diff/assert/out.nix

@@ -0,0 +1,27 @@
+[
+  (assert b; e)
+  (assert b; # d
+    e)
+  (assert b # c
+  ;
+    e)
+  (assert b # c
+  ; # d
+    e)
+  (assert # a
+    b;
+    e)
+  (assert # a
+    b; # d
+    e)
+  (assert # a
+    b # c
+  ;
+    e)
+  (assert # a
+    b # c
+  ; # d
+    e)
+  (assert b; cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc)
+  (assert b; cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc)
+]

test/diff/attr_set/in.nix

@@ -0,0 +1,60 @@
+[
+  {}
+  {/*a*/}
+  {a=1;}
+  {a=1;
+  }
+
+  {       b=1;       }
+  {       b=1; /*c*/ }
+  { /*a*/ b=1;       }
+  { /*a*/ b=1; /*c*/ }
+
+  rec       {       c=1;       }
+  rec       {       c=1; /*d*/ }
+  rec       { /*b*/ c=1;       }
+  rec       { /*b*/ c=1; /*d*/ }
+  rec /*a*/ {       c=1;       }
+  rec /*a*/ {       c=1; /*d*/ }
+  rec /*a*/ { /*b*/ c=1;       }
+  rec /*a*/ { /*b*/ c=1; /*d*/ }
+
+  {
+    a=rec {
+    a={
+    a=rec {
+    a={
+    a=rec {a={a=rec {a={a=rec {a={};};};};};};};};};};}
+
+  rec {
+
+    c=1;
+
+
+    e=1;
+
+
+  }
+
+  rec
+  /*a*/
+  {
+
+
+    /*b*/
+
+
+    c=1;
+
+
+    /*d*/
+
+
+    e=1;
+
+
+    /*f*/
+
+
+  }
+]

test/diff/attr_set/out.nix

@@ -0,0 +1,81 @@
+[
+  { }
+  { # a
+  }
+  { a = 1; }
+  { a = 1; }
+
+  { b = 1; }
+  {
+    b = 1; # c
+  }
+  { # a
+    b = 1;
+  }
+  { # a
+    b = 1; # c
+  }
+
+  rec { c = 1; }
+  rec {
+    c = 1; # d
+  }
+  rec { # b
+    c = 1;
+  }
+  rec { # b
+    c = 1; # d
+  }
+  rec # a
+  {
+    c = 1;
+  }
+  rec # a
+  {
+    c = 1; # d
+  }
+  rec # a
+  { # b
+    c = 1;
+  }
+  rec # a
+  { # b
+    c = 1; # d
+  }
+
+  {
+    a = rec {
+      a = {
+        a = rec {
+          a = {
+            a = rec { a = { a = rec { a = { a = rec { a = { }; }; }; }; }; };
+          };
+        };
+      };
+    };
+  }
+
+  rec {
+
+    c = 1;
+
+    e = 1;
+
+  }
+
+  rec
+  # a
+  {
+
+    # b
+
+    c = 1;
+
+    # d
+
+    e = 1;
+
+    # f
+
+  }
+]