From bfe9b50e828ad56312e486cbf4165ff1ac3a9bae Mon Sep 17 00:00:00 2001
From: Katherine Cox <cox.katherine.e@gmail.com>
Date: Tue, 12 Aug 2014 17:14:47 -0500
Subject: [PATCH] Added a checker for empty strings w/ corresponding test.

---
 validation.go      |  8 ++++++++
 validation_test.go | 12 ++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/validation.go b/validation.go
index d6ebf30..ea70fd4 100644
--- a/validation.go
+++ b/validation.go
@@ -134,6 +134,14 @@ func GreaterThan(param int, comparativeVal int, paramName string) Checker {
 	}
 }
 
+func StringNotEmpty(obtained, paramName string) Checker {
+	return func() (isNotEmpty bool, errMsg string) {
+		isNotEmpty = obtained != ""
+		errMsg = fmt.Sprintf("Parameter is an empty string: %s", paramName)
+		return
+	}
+}
+
 func validationFactory(numErrors int) *Validation {
 	return &Validation{make([]string, numErrors)}
 }
diff --git a/validation_test.go b/validation_test.go
index 650cd99..211a115 100644
--- a/validation_test.go
+++ b/validation_test.go
@@ -155,3 +155,15 @@ func TestGreaterThan(t *testing.T) {
 		t.FailNow()
 	}
 }
+
+func TestStringNotEmpty(t *testing.T) {
+
+	err := BeginValidation().Validate(
+		StringNotEmpty("", "tmpA"),
+	).Check()
+
+	if err == nil {
+		t.Errorf("Expected an error.")
+		t.FailNow()
+	}
+}