Test for random.go added

random_test.go

@@ -0,0 +1,70 @@
+// SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+//
+// SPDX-License-Identifier: MIT
+
+package mail
+
+import (
+	"strings"
+	"testing"
+)
+
+// TestRandomStringSecure tests the randomStringSecure method
+func TestRandomStringSecure(t *testing.T) {
+	tt := []struct {
+		testName     string
+		length       int
+		mustNotMatch string
+	}{
+		{"20 chars", 20, "'"},
+		{"100 chars", 100, "'"},
+		{"1000 chars", 1000, "'"},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.testName, func(t *testing.T) {
+			rs, err := randomStringSecure(tc.length)
+			if err != nil {
+				t.Errorf("random string generation failed: %s", err)
+			}
+			if strings.Contains(rs, tc.mustNotMatch) {
+				t.Errorf("random string contains unexpected character. got: %s, not-expected: %s",
+					rs, tc.mustNotMatch)
+			}
+			if len(rs) != tc.length {
+				t.Errorf("random string length does not match. expected: %d, got: %d", tc.length, len(rs))
+			}
+		})
+	}
+}
+
+// TestRandomNum tests the randomNum method
+func TestRandomNum(t *testing.T) {
+	tt := []struct {
+		testName string
+		max      int
+	}{
+		{"Max: 1", 1},
+		{"Max: 20", 20},
+		{"Max: 50", 50},
+		{"Max: 100", 100},
+		{"Max: 1000", 1000},
+		{"Max: 10000", 10000},
+		{"Max: 100000000", 100000000},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.testName, func(t *testing.T) {
+			rn, err := randNum(tc.max)
+			if err != nil {
+				t.Errorf("random number generation failed: %s", err)
+			}
+			if rn < 0 {
+				t.Errorf("random number generation failed: %d is smaller than zero", rn)
+			}
+			if rn > tc.max {
+				t.Errorf("random number generation failed: %d is bigger than given value %d", rn, tc.max)
+			}
+		})
+	}
+}