diff --git a/tests/modules/programs/git/default.nix b/tests/modules/programs/git/default.nix
index 5f2330dd..ad37969c 100644
--- a/tests/modules/programs/git/default.nix
+++ b/tests/modules/programs/git/default.nix
@@ -10,4 +10,5 @@
   git-with-hooks = ./git-with-hooks.nix;
   git-with-maintenance = ./git-with-maintenance.nix;
   git-patdiff = ./git-patdiff.nix;
+  git-difftastic = ./git-difftastic.nix;
 }
diff --git a/tests/modules/programs/git/git-difftastic-expected.conf b/tests/modules/programs/git/git-difftastic-expected.conf
new file mode 100644
index 00000000..524d8c20
--- /dev/null
+++ b/tests/modules/programs/git/git-difftastic-expected.conf
@@ -0,0 +1,12 @@
+[diff]
+	external = "@difftastic@/bin/difft --color always --background dark --display inline"
+	tool = "difftastic"
+
+[difftool "difftastic"]
+	cmd = "@difftastic@/bin/difft --color always --background dark --display inline $LOCAL $REMOTE"
+
+[gpg]
+	format = "openpgp"
+
+[gpg "openpgp"]
+	program = "path-to-gpg"
diff --git a/tests/modules/programs/git/git-difftastic.nix b/tests/modules/programs/git/git-difftastic.nix
new file mode 100644
index 00000000..99fec745
--- /dev/null
+++ b/tests/modules/programs/git/git-difftastic.nix
@@ -0,0 +1,18 @@
+{
+  programs.git = {
+    enable = true;
+    signing.signer = "path-to-gpg";
+    difftastic = {
+      enable = true;
+      enableAsDifftool = true;
+      background = "dark";
+      color = "always";
+      display = "inline";
+    };
+  };
+
+  nmt.script = ''
+    assertFileExists home-files/.config/git/config
+    assertFileContent home-files/.config/git/config ${./git-difftastic-expected.conf}
+  '';
+}