proj: add package tests

Add simple package test by running proj CLI tool.

This change also improves derivation overriding behavior by using
`finalAttrs` function.

Co-authored-by: Robert Scott <github@humanleg.org.uk>

pkgs/development/libraries/proj/default.nix

@@ -5,6 +5,7 @@
 , cmake
 , pkg-config
 , buildPackages
+, callPackage
 , sqlite
 , libtiff
 , curl
@@ -13,7 +14,7 @@
 , python3
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: rec {
   pname = "proj";
   version = "9.1.1";
 
@@ -62,6 +63,7 @@ stdenv.mkDerivation rec {
 
   passthru.tests = {
     python = python3.pkgs.pyproj;
+    proj = callPackage ./tests.nix { proj = finalAttrs.finalPackage; };
   };
 
   meta = with lib; {
@@ -71,4 +73,4 @@ stdenv.mkDerivation rec {
     platforms = platforms.unix;
     maintainers = with maintainers; [ dotlambda ];
   };
-}
+})

pkgs/development/libraries/proj/tests.nix

@@ -0,0 +1,11 @@
+{ runCommand, proj }:
+
+let
+  inherit (proj) pname;
+in
+runCommand "${pname}-tests" { meta.timeout = 60; }
+  ''
+    ${proj}/bin/projinfo EPSG:4326 \
+      | grep '+proj=longlat +datum=WGS84 +no_defs +type=crs'
+    touch $out
+  ''