fix test cases

Author: stuarthicks

gokay/length.go

@@ -25,7 +25,7 @@ func MinLengthString(expected int64, str *string) error {
 		return nil // Covers the case where a value can be Nil OR has a length constraint
 	}
 
-	if expected < int64(len(*str)) {
+	if expected > int64(len(*str)) {
 		return fmt.Errorf("Length was '%d', needs to be at least '%d'", len(*str), expected)
 	}
 	return nil

gokay/length_test.go

@@ -35,10 +35,10 @@ func TestMinLengthString(t *testing.T) {
 		String    string
 		MinLength int64
 	}{
+		{String: "foo", MinLength: 1},
 		{String: "foo", MinLength: 3},
 		{String: "", MinLength: 0},
 		{String: "a", MinLength: 1},
-		{String: "a", MinLength: 100},
 	}
 	for _, tc := range validCases {
 		tc := tc
@@ -52,9 +52,9 @@ func TestMinLengthString(t *testing.T) {
 		String    string
 		MinLength int64
 	}{
-		{String: "foo", MinLength: 1},
-		{String: "1", MinLength: 0},
-		{String: "", MinLength: -1},
+		{String: "1", MinLength: 2},
+		{String: "a", MinLength: 100},
+		{String: "", MinLength: 1},
 	}
 	for _, tc := range invalidCases {
 		tc := tc