mypy: init module (#7656)

tests/modules/programs/mypy/basic-config.nix

@@ -0,0 +1,47 @@
+{ pkgs, ... }:
+
+{
+  programs.mypy = {
+    enable = true;
+
+    package = pkgs.mypy;
+
+    settings = {
+      mypy = {
+        warn_return_any = true;
+        warn_unused_configs = true;
+      };
+
+      "mypy-mycode.foo.*" = {
+        disallow_untyped_defs = true;
+      };
+
+      "mypy-mycode.bar".warn_return_any = false;
+
+      "mypy-somelibrary".ignore_missing_imports = true;
+    };
+  };
+
+  nmt.script =
+    let
+      configFile = "home-files/.config/mypy/config";
+    in
+    ''
+      assertFileExists ${configFile}
+      assertFileContent ${configFile} \
+        ${pkgs.writeText "settings-expected" ''
+          [mypy]
+          warn_return_any=true
+          warn_unused_configs=true
+
+          [mypy-mycode.bar]
+          warn_return_any=false
+
+          [mypy-mycode.foo.*]
+          disallow_untyped_defs=true
+
+          [mypy-somelibrary]
+          ignore_missing_imports=true
+        ''}
+    '';
+}

tests/modules/programs/mypy/default.nix

@@ -0,0 +1,3 @@
+{
+  mypy-basic-config = ./basic-config.nix;
+}