[🤖] Add Unit-Tests

langext/base62_test.go

@@ -0,0 +1,86 @@
+package langext
+
+import (
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
+	"strings"
+	"testing"
+)
+
+func TestEncodeBase62Zero(t *testing.T) {
+	tst.AssertEqual(t, EncodeBase62(0), "0")
+}
+
+func TestEncodeBase62Small(t *testing.T) {
+	tst.AssertEqual(t, EncodeBase62(1), "1")
+	tst.AssertEqual(t, EncodeBase62(9), "9")
+	tst.AssertEqual(t, EncodeBase62(10), "A")
+	tst.AssertEqual(t, EncodeBase62(35), "Z")
+	tst.AssertEqual(t, EncodeBase62(36), "a")
+	tst.AssertEqual(t, EncodeBase62(61), "z")
+	tst.AssertEqual(t, EncodeBase62(62), "10")
+}
+
+func TestDecodeBase62Empty(t *testing.T) {
+	_, err := DecodeBase62("")
+	if err == nil {
+		t.Errorf("expected error on empty input")
+	}
+}
+
+func TestDecodeBase62Invalid(t *testing.T) {
+	_, err := DecodeBase62("foo!bar")
+	if err == nil {
+		t.Errorf("expected error on invalid character")
+	}
+}
+
+func TestDecodeBase62Basic(t *testing.T) {
+	v, err := DecodeBase62("0")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	tst.AssertEqual(t, v, uint64(0))
+
+	v, err = DecodeBase62("10")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	tst.AssertEqual(t, v, uint64(62))
+}
+
+func TestEncodeDecodeBase62RoundTrip(t *testing.T) {
+	for _, n := range []uint64{0, 1, 61, 62, 100, 12345, 1<<32 - 1, 1 << 40} {
+		s := EncodeBase62(n)
+		v, err := DecodeBase62(s)
+		if err != nil {
+			t.Errorf("decode error for %d (encoded %q): %v", n, s, err)
+			continue
+		}
+		tst.AssertEqual(t, v, n)
+	}
+}
+
+func TestRandBase62Length(t *testing.T) {
+	for _, l := range []int{0, 1, 8, 32, 64} {
+		s := RandBase62(l)
+		tst.AssertEqual(t, len(s), l)
+	}
+}
+
+func TestRandBase62Alphabet(t *testing.T) {
+	const alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	s := RandBase62(256)
+	for _, r := range s {
+		if !strings.ContainsRune(alphabet, r) {
+			t.Errorf("character %q not in base62 alphabet", string(r))
+		}
+	}
+}
+
+func TestRandBase62Distinct(t *testing.T) {
+	a := RandBase62(32)
+	b := RandBase62(32)
+	if a == b {
+		t.Errorf("two base62 random strings of length 32 should not be equal")
+	}
+}