fish: add some tests

- If a function is defined, check that the function file exists and
  that the contents matches a given string.

- If no functions exists, the functions folder should not exist.

- Verify plugin functionality.

tests/default.nix

@@ -29,6 +29,7 @@ import nmt {
     ./modules/programs/alacritty
     ./modules/programs/bash
     ./modules/programs/browserpass
+    ./modules/programs/fish
     ./modules/programs/git
     ./modules/programs/gpg
     ./modules/programs/mbsync

tests/modules/programs/fish/default.nix

@@ -0,0 +1,5 @@
+{
+  fish-functions = ./functions.nix;
+  fish-no-functions = ./no-functions.nix;
+  fish-plugins = ./plugins.nix;
+}

tests/modules/programs/fish/functions.nix

@@ -0,0 +1,32 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  func = pkgs.writeText "func.fish" ''
+    function func
+      echo "Hello"
+    end
+  '';
+
+in {
+  config = {
+    programs.fish = {
+      enable = true;
+
+      functions = { func = ''echo "Hello"''; };
+    };
+
+    nmt = {
+      description =
+        "if fish.function is set, check file exists and contents match";
+      script = ''
+        assertFileExists home-files/.config/fish/functions/func.fish
+        echo ${func}
+        assertFileContent home-files/.config/fish/functions/func.fish ${func}
+      '';
+
+    };
+  };
+}

tests/modules/programs/fish/no-functions.nix

@@ -0,0 +1,22 @@
+{ config, lib, ... }:
+
+with lib;
+
+{
+  config = {
+    programs.fish = {
+      enable = true;
+
+      functions = { };
+    };
+
+    nmt = {
+      description =
+        "if fish.functions is blank, the functions folder should not exist.";
+      script = ''
+        assertPathNotExists home-files/.config/fish/functions
+      '';
+
+    };
+  };
+}

tests/modules/programs/fish/plugins.nix

@@ -0,0 +1,58 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  fooPluginSrc = pkgs.writeText "fooPluginSrc" "";
+
+  generatedConfdFile = pkgs.writeText "plugin-foo.fish" ''
+    # Plugin foo
+    set -l plugin_dir ${fooPluginSrc}
+
+    # Set paths to import plugin components
+    if test -d $plugin_dir"/functions"
+      set fish_function_path $fish_function_path[1] $plugin_dir"/functions" $fish_function_path[2..-1]
+    end
+
+    if test -d $plugin_dir"/completions"
+      set fish_complete_path $fish_function_path[1] $plugin_dir"/completions" $fish_complete_path[2..-1]
+    end
+
+    # Source initialization code if it exists.
+    if test -d $plugin_dir"/conf.d"
+      source $plugin_dir"/conf.d/*.fish"
+    end
+
+    if test -f $plugin_dir"/key_bindings.fish"
+      source $plugin_dir"/key_bindings.fish"
+    end
+
+    if test -f $plugin_dir"/init.fish"
+      source $plugin_dir"/init.fish"
+    end
+  '';
+
+in {
+  config = {
+    programs.fish = {
+      enable = true;
+
+      plugins = [{
+        name = "foo";
+        src = fooPluginSrc;
+      }];
+    };
+
+    nmt = {
+      description =
+        "if fish.plugins set, check conf.d file exists and contents match";
+      script = ''
+        assertDirectoryExists home-files/.config/fish/conf.d
+        assertFileExists home-files/.config/fish/conf.d/plugin-foo.fish
+        assertFileContent home-files/.config/fish/conf.d/plugin-foo.fish ${generatedConfdFile}
+      '';
+
+    };
+  };
+}