added SmolStr

tests/root.zig

@@ -1 +1,38 @@
 const std = @import("std");
+
+const SmolStr = @import("smolstr").SmolStr;
+
+test "inline" {
+    const alloc = std.testing.allocator;
+
+    const s = "abcdefghijklmnopqrstuvwxyz";
+
+    for (1..SmolStr.max_inline_len + 1) |i| {
+        const sub_s: []const u8 = s[0..i];
+
+        const str = try SmolStr.init(alloc, sub_s);
+        defer str.deinit(alloc);
+
+        try std.testing.expectEqual(i, str.inner.inl.len);
+        try std.testing.expectEqualStrings(s[0..i], str.inner.inl.data[0..str.inner.inl.len]);
+
+        try std.testing.expectEqual(i, str.len());
+        try std.testing.expectEqualStrings(s[0..i], str.str());
+
+        try std.testing.expectEqual(s[0], str.str()[0]);
+    }
+}
+
+test "heap" {
+    const alloc = std.testing.allocator;
+
+    const s = "abcdefghijklmnopqrstuvwxyz";
+
+    const str = try SmolStr.init(alloc, s);
+    defer str.deinit(alloc);
+
+    try std.testing.expectEqualStrings(s, str.inner.heap);
+
+    try std.testing.expectEqual(s.len, str.len());
+    try std.testing.expectEqualStrings(s, str.str());
+}