fix `test --prepare` with non-busted rocks (#1453)

* fix `test --prepare` with non-busted rocks

2 files changed, 14 insertions, 1 deletions

diff --git a/spec/test_spec.lua b/spec/test_spec.lua
index 33643097..4be0567f 100644
--- a/spec/test_spec.lua
+++ b/spec/test_spec.lua
@@ -98,6 +98,15 @@ describe("luarocks test #integration", function()
 
       end)
    end)
+
+   describe("command backend", function()
+      describe("prepare", function()
+         it("works with non-busted rocks", function()
+            write_file("test.lua", "", finally)
+            assert.is_true(run.luarocks_bool("test --prepare " .. testing_paths.fixtures_dir .. "/a_rock-1.0-1.rockspec"))
+         end)
+      end)
+   end)
 end)
 
 test_env.unload_luarocks()
diff --git a/src/luarocks/test.lua b/src/luarocks/test.lua
index 2a836671..d074b950 100644
--- a/src/luarocks/test.lua
+++ b/src/luarocks/test.lua
@@ -77,7 +77,11 @@ function test.run_test_suite(rockspec_arg, test_type, args, prepare)
    end
 
    if prepare then
-      return test_mod.run_tests(rockspec_arg, {"--version"})
+      if test_type == "busted" then
+         return test_mod.run_tests(rockspec_arg, {"--version"})
+      else
+         return true
+      end
    else
       local flags = rockspec.test and rockspec.test.flags
       if type(flags) == "table" then