fix tests

builtin/bytes.mbt

@@ -59,7 +59,8 @@ pub fn blit(
 
 /// Create a new String from byte sequence.
 pub fn to_string(self : Bytes) -> String {
-  let buf = Buffer::make(self.length() * 4 + 2)
+  // the length of the result string is at most bytes.length() * 4 + 8
+  let buf = Buffer::make(self.length() * 4 + 8)
   buf.write_string("Bytes::[")
   for i = 0; i < self.length(); i = i + 1 {
     if i != 0 {

bytes/bytes_test.mbt

@@ -14,7 +14,7 @@
 
 test "from_array" {
   let b = Bytes::[65, 0, 66, 0, 67, 0]
-  inspect(b.to_string(), content="ABC")?
+  inspect(b, content="Bytes::[65,0,66,0,67,0]")?
 }
 
 test "hash" {

string/string.mbt

@@ -54,10 +54,14 @@ pub fn to_bytes(self : String) -> Bytes {
 }
 
 test "to_bytes" {
-  @assertion.assert_eq("中文".to_bytes().to_string(), "中文")?
-  @assertion.assert_eq("asdf".to_bytes().to_string(), "asdf")?
-  @assertion.assert_eq("🤣🤣".to_bytes().to_string(), "🤣🤣")?
-  @assertion.assert_eq("🤔".to_bytes().to_string(), "🤔")?
+  fn f(x : String) {
+    x.to_bytes().to_unchecked_string()
+  }
+
+  inspect("中文" |> f, content="中文")?
+  inspect("asdf" |> f, content="asdf")?
+  inspect("🤣🤣" |> f, content="🤣🤣")?
+  inspect("🤔" |> f, content="🤔")?
 }
 
 pub fn hash(self : String) -> Int {
@@ -89,7 +93,7 @@ test "debug_write" {
 test "Buffer::to_bytes" {
   let buffer = Buffer::make(16)
   buffer.write_string("中文")
-  @assertion.assert_eq(buffer.to_bytes().to_string(), "中文")?
+  inspect(buffer.to_bytes().to_unchecked_string(), content="中文")?
 }
 
 /// Converts the String into an array of Chars.

uuid/uuid.mbt

@@ -80,7 +80,10 @@ test "bytes" {
   let buf = Bytes::[
     201, 130, 251, 104, 223, 80, 76, 161, 145, 248, 186, 162, 4, 9, 229, 185,
   ]
-  inspect(from_bytes(buf)?.to_bytes(), content="苉棻僟ꅌꊺऄ맥")? // XXX: this is a terrible Show
+  inspect(
+    from_bytes(buf)?.to_bytes(),
+    content="Bytes::[201,130,251,104,223,80,76,161,145,248,186,162,4,9,229,185]",
+  )?
   inspect(from_bytes(Bytes::make(15, 0)), content="Err(requires 16 bytes)")?
   inspect(from_bytes(Bytes::make(17, 0)), content="Err(requires 16 bytes)")?
 }
@@ -167,14 +170,14 @@ pub fn to_string(self : UUID) -> String {
       rv[i - 1] = dash
       continue v, i - 2, i - 2, d - 1
     } else {
-      break rv.to_string()
+      break rv.to_unchecked_string()
     }
   }
 }
 
 test "from_hex" {
   let hex = "13cb501c-1234-5678-9034-abcdef937e20"
-  inspect(from_hex(hex)?, content=hex)?
+  inspect(from_hex(hex)?, content="13cb501c-1234-5678-9034-abcdef937e20")?
   inspect(
     from_hex("12345678-1234-1234-1234-ABCDEF098765")?,
     content="12345678-1234-1234-1234-abcdef098765",