lib/tests: Add tests for attrsOf and lazyAttrsOf

lib/tests/modules.sh

···
 # Check that imports can depend on derivations
 checkConfigOutput "true" config.enable ./import-from-store.nix
 
+# Check attrsOf and lazyAttrsOf. Only lazyAttrsOf should be lazy, and only
+# attrsOf should work with conditional definitions
+# In addition, lazyAttrsOf should honor an options emptyValue
+checkConfigError "is not lazy" config.isLazy ./declare-attrsOf.nix ./attrsOf-lazy-check.nix
+checkConfigOutput "true" config.isLazy ./declare-lazyAttrsOf.nix ./attrsOf-lazy-check.nix
+checkConfigOutput "true" config.conditionalWorks ./declare-attrsOf.nix ./attrsOf-conditional-check.nix
+checkConfigOutput "false" config.conditionalWorks ./declare-lazyAttrsOf.nix ./attrsOf-conditional-check.nix
+checkConfigOutput "empty" config.value.foo ./declare-lazyAttrsOf.nix ./attrsOf-conditional-check.nix
+
 cat <<EOF
 ====== module tests ======
 $pass Pass

lib/tests/modules/attrsOf-conditional-check.nix

···
+{ lib, config, ... }: {
+  options.conditionalWorks = lib.mkOption {
+    default = ! config.value ? foo;
+  };
+
+  config.value.foo = lib.mkIf false "should not be defined";
+}

lib/tests/modules/attrsOf-lazy-check.nix

···
+{ lib, config, ... }: {
+  options.isLazy = lib.mkOption {
+    default = ! config.value ? foo;
+  };
+
+  config.value.bar = throw "is not lazy";
+}

lib/tests/modules/declare-attrsOf.nix

···
+{ lib, ... }: {
+  options.value = lib.mkOption {
+    type = lib.types.attrsOf lib.types.str;
+    default = {};
+  };
+}

lib/tests/modules/declare-lazyAttrsOf.nix

···
+{ lib, ... }: {
+  options.value = lib.mkOption {
+    type = lib.types.lazyAttrsOf (lib.types.str // { emptyValue.value = "empty"; });
+    default = {};
+  };
+}