rust2rpm: add support for "testrequires" setting in rust2rpm.conf

Dependencies listed as "testrequires" are handled the same as dependencies
that are listed as "buildrequires", except that they are wrapped in an
"%if %{with check}" conditional in the generated spec file.

README.md

@@ -23,6 +23,9 @@ These configuration options are available right now:
   compiler internals for crates that are also bundled with Rust itself)
 - `buildrequires`: additional build dependencies that must be installed for the
   package to build correctly (i.e., `pkgconfig(foo)` for the `foo-sys` crate)
+- `testrequires`: additional build dependencies that must be installed for the
+  package's tests to build and / or run correctly (treated like `buildrequires`,
+  but wrapped in an `%if %{with check}` conditional in the generated spec)
 - `lib.requires`: additional build dependencies that must be installed for the
   crate to build correctly as a dependency of another crate (usually, this
   contains the same values as the `buildrequires` option)

rust2rpm/templates/main.spec

@@ -78,6 +78,13 @@ BuildRequires:  {{ req }}
   {% for req in to_list(distconf.get("buildrequires"))|sort %}
 BuildRequires:  {{ req }}
   {% endfor %}
+  {% if distconf.get("testrequires") %}
+%if %{with check}
+  {% for req in to_list(distconf.get("testrequires"))|sort %}
+BuildRequires:  {{ req }}
+  {% endfor %}
+%endif
+  {% endif %}
   {% if has_buildrequires and not only_main %}
   {% endif %}
 {% endif %}
@@ -205,6 +212,13 @@ use {% if feature is not none %}the "{{ feature }}" feature of {% endif %}the "%
   {% for req in to_list(distconf.get("buildrequires"))|sort %}
 echo {{ "%r" | format(req) }}
   {% endfor %}
+  {% if distconf.get("testrequires") %}
+%if %{with check}
+  {% for req in to_list(distconf.get("testrequires"))|sort %}
+echo {{ "%r" | format(req) }}
+  {% endfor %}
+%endif
+  {% endif %}
 
 {% endif -%}