added: Required float64 validation rule

required.go

@@ -22,3 +22,9 @@ func (v *Validator) RequiredInt(i int, field string, msg string) *Validator {
 
 	return v
 }
+
+func (v *Validator) RequiredFloat(f float64, field string, msg string) *Validator {
+	v.Check(f != 0.0, field, v.msg(Required, msg, field))
+
+	return v
+}

required_test.go

@@ -1,6 +1,7 @@
 package validator
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -48,3 +49,47 @@ func TestValidator_RequiredString(t *testing.T) {
 		}
 	}
 }
+
+func TestValidator_RequiredFloat(t *testing.T) {
+	tests := []struct {
+		tag         string
+		value       float64
+		message     string
+		isPassed    bool
+		expectedMsg string
+	}{
+		{
+			tag:         "t0",
+			value:       1.0,
+			message:     "",
+			isPassed:    true,
+			expectedMsg: "f2 is required",
+		},
+		{
+			tag:         "t1",
+			value:       -1.0,
+			message:     "f2 is required",
+			isPassed:    true,
+			expectedMsg: fmt.Sprintf(RequiredMsg, "t1"),
+		},
+		{
+			tag:         "t2",
+			value:       0.0,
+			message:     "f2 is required",
+			isPassed:    false,
+			expectedMsg: "f2 is required",
+		},
+	}
+
+	v := New()
+
+	for _, test := range tests {
+		v.RequiredFloat(test.value, test.tag, test.message)
+
+		assert.Equal(t, test.isPassed, v.IsPassed())
+
+		if !test.isPassed {
+			assert.Equal(t, test.expectedMsg, v.Errors()[test.tag])
+		}
+	}
+}