emacs: add test case for darwin

tests/default.nix

@@ -173,6 +173,7 @@ in import nmtSrc {
     ./modules/xresources
   ] ++ lib.optionals isDarwin [
     ./modules/launchd
+    ./modules/services/emacs-darwin
     ./modules/services/espanso-darwin
     ./modules/services/git-sync-darwin
     ./modules/services/imapnotify-darwin

tests/modules/services/emacs-darwin/basic.nix

@@ -0,0 +1,13 @@
+{ ... }: {
+  emacs = { enable = true; };
+
+  test.stubs.nix = { };
+
+  nmt.script = ''
+    serviceFile=LaunchAgents/org.nix-community.home.emacs.plist
+
+    assertFileExists "$serviceFile"
+
+    assertFileContent "$serviceFile" ${./expected-agent.plist}
+  '';
+}

tests/modules/services/emacs-darwin/default.nix

@@ -0,0 +1 @@
+{ emacs = ./basic.nix; }

tests/modules/services/emacs-darwin/expected-agent.plist

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+        <key>KeepAlive</key>
+        <dict>
+                <key>Crashed</key>
+                <true/>
+                <key>SuccessfulExit</key>
+                <false/>
+        </dict>
+        <key>Label</key>
+        <string>org.nix-community.home.emacs</string>
+        <key>ProgramArguments</key>
+        <array>
+                <string>@emacs/bin/emacs</string>
+                <string>--fg-daemon</string>
+        </array>
+        <key>RunAtLoad</key>
+        <true/>
+</dict>
+</plist>%