DString reverse and an initial BigInt implementation (untested),

test/unit/stdlib/core/dstring.c3

@@ -10,6 +10,20 @@ fn void test_replace()
 	assert(hello.str_view() == "Hello world where are yoooo? Are yoooo here too?");
 }
 
+fn void test_reverse()
+{
+	DString a;
+	a.append("abcd");
+	a.reverse();
+	assert(a.str_view() == "dcba");
+	a.reverse();
+	assert(a.str_view() == "abcd");
+	a.append("e");
+	assert(a.str_view() == "abcde");
+	a.reverse();
+	assert(a.str_view() == "edcba");
+}
+
 fn void test_delete()
 {
 	{

test/unit/stdlib/math/bigint.c3

@@ -0,0 +1,34 @@
+module std::math::bigint @test;
+
+fn void test_plus()
+{
+	BigInt a = bigint::from_int(123);
+	BigInt b = bigint::from_int(234);
+	assert(a.add(b).equals(bigint::from_int(234 + 123)));
+
+	a = bigint::from_int(12323400012311213314141414i128);
+	b = bigint::from_int(23400012311213314141414i128);
+	assert(a.add(b).equals(bigint::from_int(12323400012311213314141414i128 + 23400012311213314141414i128)));
+}
+
+fn void test_minus()
+{
+	BigInt a = bigint::from_int(123);
+	BigInt b = bigint::from_int(234);
+	assert(a.sub(b).equals(bigint::from_int(123 - 234)));
+
+	a = bigint::from_int(12323400012311213314141414i128);
+	b = bigint::from_int(23400012311213314141414i128);
+	assert(a.sub(b).equals(bigint::from_int(12323400012311213314141414i128 - 23400012311213314141414i128)));
+}
+
+fn void test_init_string_radix()
+{
+	BigInt a;
+	a.init_string_radix("123", 10)!!;
+	assert(a.equals(bigint::from_int(123)));
+	a.init_string_radix("123", 8)!!;
+	assert(a.equals(bigint::from_int(0o123)));
+	a.init_string_radix("123", 16)!!;
+	assert(a.equals(bigint::from_int(0x123)));
+}