a lot oh changes to the test framework and new test files t_builtin-fmt_test.go and t_plugin_test.go added

t_utils_test.go

@@ -6,6 +6,7 @@ package expr
 
 import (
 	"errors"
+	"reflect"
 	"testing"
 )
 
@@ -154,3 +155,12 @@ func TestAnyInteger(t *testing.T) {
 	}
 	t.Logf("%s -- test count: %d, succeeded: %d, failed: %d", section, len(inputs), succeeded, failed)
 }
+
+func TestCopyMap(t *testing.T) {
+	source := map[string]int{"one": 1, "two": 2, "three": 3}
+	dest := make(map[string]int)
+	result := CopyMap(dest, source)
+	if !reflect.DeepEqual(result, source) {
+		t.Errorf("utils.CopyMap() failed")
+	}
+}