JSON tests related changes (#4461)

* test functions take time.Now and other minor changes

* updated remaining test files

* Update validation_test.go

* fix typo

* go fmt

* import time

Co-authored-by: Marko <marbar3778@yahoo.com>

libs/math/fraction.go

@@ -6,10 +6,10 @@ import "fmt"
 // format.
 type Fraction struct {
 	// The portion of the denominator in the faction, e.g. 2 in 2/3.
-	Numerator int64
+	Numerator int64 `json:"numerator"`
 	// The value by which the numerator is divided, e.g. 3 in 2/3. Must be
 	// positive.
-	Denominator int64
+	Denominator int64 `json:"denominator"`
 }
 
 func (fr Fraction) String() string {