test(toolsets): toolset specific metadata tests (#326)

- Refactor tests to use testify (more clarity+composability for complex tests)
- Tests for default toolsets
- Tests for configured, granular toolsets

Signed-off-by: Marc Nuri <marc@marcnuri.com>

pkg/toolsets/toolsets_test.go

@@ -10,12 +10,20 @@ import (
 
 type ToolsetsSuite struct {
 	suite.Suite
+	originalToolsets []api.Toolset
 }
 
 func (s *ToolsetsSuite) SetupTest() {
+	s.originalToolsets = Toolsets()
 	Clear()
 }
 
+func (s *ToolsetsSuite) TearDownTest() {
+	for _, toolset := range s.originalToolsets {
+		Register(toolset)
+	}
+}
+
 type TestToolset struct {
 	name        string
 	description string