Migrate accessors_test.rs to googletest-rust

The flexibility of googletest-rust looks promising:
```
assert_that!(msg.oneof_field(), matches_pattern!(not_set(_)));
assert_that!(msg.oneof_field(), matches_pattern!(OneofUint32(eq(7))));

+nonfatal assertions + custom matchers
```

PiperOrigin-RevId: 572272465

rust/test/shared/BUILD

@@ -127,6 +127,7 @@ rust_test(
         "not_build:arm",
     ],
     deps = [
+        "//third_party/gtest_rust/googletest",
         "//rust:protobuf_cpp",
         "//rust/test:unittest_cc_rust_proto",
     ],
@@ -143,6 +144,7 @@ rust_test(
         "not_build:arm",
     ],
     deps = [
+        "//third_party/gtest_rust/googletest",
         "//rust:protobuf_upb",
         "//rust/test:unittest_upb_rust_proto",
     ],

rust/test/shared/accessors_test.rs

@@ -7,359 +7,363 @@
 
 //! Tests covering accessors for singular bool, int32, int64, and bytes fields.
 
+use googletest::prelude::*;
 use protobuf::Optional;
 use unittest_proto::proto2_unittest::{TestAllTypes, TestAllTypes_};
 
 #[test]
 fn test_default_accessors() {
     let msg = TestAllTypes::new();
-    assert_eq!(msg.default_int32(), 41);
+    assert_that!(
-    assert_eq!(msg.default_int64(), 42);
+        msg,
-    assert_eq!(msg.default_uint32(), 43);
+        matches_pattern!(TestAllTypes{
-    assert_eq!(msg.default_uint64(), 44);
+            default_int32(): eq(41),
-    assert_eq!(msg.default_sint32(), -45);
+            default_int64(): eq(42),
-    assert_eq!(msg.default_sint64(), 46);
+            default_uint32(): eq(43),
-    assert_eq!(msg.default_fixed32(), 47);
+            default_uint64(): eq(44),
-    assert_eq!(msg.default_fixed64(), 48);
+            default_sint32(): eq(-45),
-    assert_eq!(msg.default_sfixed32(), 49);
+            default_sint64(): eq(46),
-    assert_eq!(msg.default_sfixed64(), -50);
+            default_fixed32(): eq(47),
-    assert_eq!(msg.default_float(), 51.5);
+            default_fixed64(): eq(48),
-    assert_eq!(msg.default_double(), 52000.0);
+            default_sfixed32(): eq(49),
-    assert_eq!(msg.default_bool(), true);
+            default_sfixed64(): eq(-50),
+            default_float(): eq(51.5),
+            default_double(): eq(52000.0),
+            default_bool(): eq(true),
+        })
+    );
 }
 
 #[test]
 fn test_optional_fixed32_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_fixed32_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_fixed32_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_fixed32(), 0);
+    assert_that!(msg.optional_fixed32(), eq(0));
 
     msg.optional_fixed32_set(Some(99));
-    assert_eq!(msg.optional_fixed32_opt(), Optional::Set(99));
+    assert_that!(msg.optional_fixed32_opt(), eq(Optional::Set(99)));
-    assert_eq!(msg.optional_fixed32(), 99);
+    assert_that!(msg.optional_fixed32(), eq(99));
 
     msg.optional_fixed32_set(None);
-    assert_eq!(msg.optional_fixed32_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_fixed32_opt(), eq(Optional::Unset(0)));
-
+    assert_that!(msg.optional_fixed32(), eq(0));
-    assert_eq!(msg.optional_fixed32(), 0);
 }
 
 #[test]
 fn test_optional_fixed64_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_fixed64_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_fixed64_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_fixed64(), 0);
+    assert_that!(msg.optional_fixed64(), eq(0));
 
     msg.optional_fixed64_set(Some(2000));
-    assert_eq!(msg.optional_fixed64_opt(), Optional::Set(2000));
+    assert_that!(msg.optional_fixed64_opt(), eq(Optional::Set(2000)));
-    assert_eq!(msg.optional_fixed64(), 2000);
+    assert_that!(msg.optional_fixed64(), eq(2000));
 
     msg.optional_fixed64_set(None);
-    assert_eq!(msg.optional_fixed64_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_fixed64_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_fixed64(), 0);
+    assert_that!(msg.optional_fixed64(), eq(0));
 }
 
 #[test]
 fn test_optional_int32_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_int32_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_int32_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_int32(), 0);
+    assert_that!(msg.optional_int32(), eq(0));
 
     msg.optional_int32_set(Some(1));
-    assert_eq!(msg.optional_int32_opt(), Optional::Set(1));
+    assert_that!(msg.optional_int32_opt(), eq(Optional::Set(1)));
-    assert_eq!(msg.optional_int32(), 1);
+    assert_that!(msg.optional_int32(), eq(1));
 
     msg.optional_int32_set(None);
-    assert_eq!(msg.optional_int32_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_int32_opt(), eq(Optional::Unset(0)));
-
+    assert_that!(msg.optional_int32(), eq(0));
-    assert_eq!(msg.optional_int32(), 0);
 }
 
 #[test]
 fn test_optional_int64_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_int64_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_int64_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_int64(), 0);
+    assert_that!(msg.optional_int64(), eq(0));
 
     msg.optional_int64_set(Some(42));
-    assert_eq!(msg.optional_int64_opt(), Optional::Set(42));
+    assert_that!(msg.optional_int64_opt(), eq(Optional::Set(42)));
-    assert_eq!(msg.optional_int64(), 42);
+    assert_that!(msg.optional_int64(), eq(42));
 
     msg.optional_int64_set(None);
-    assert_eq!(msg.optional_int64_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_int64_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_int64(), 0);
+    assert_that!(msg.optional_int64(), eq(0));
 }
 
 #[test]
 fn test_optional_sint32_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_sint32_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_sint32_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_sint32(), 0);
+    assert_that!(msg.optional_sint32(), eq(0));
 
     msg.optional_sint32_set(Some(-22));
-    assert_eq!(msg.optional_sint32_opt(), Optional::Set(-22));
+    assert_that!(msg.optional_sint32_opt(), eq(Optional::Set(-22)));
-    assert_eq!(msg.optional_sint32(), -22);
+    assert_that!(msg.optional_sint32(), eq(-22));
 
     msg.optional_sint32_set(None);
-    assert_eq!(msg.optional_sint32_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_sint32_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_sint32(), 0);
+    assert_that!(msg.optional_sint32(), eq(0));
 }
 
 #[test]
 fn test_optional_sint64_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_sint64_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_sint64_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_sint64(), 0);
+    assert_that!(msg.optional_sint64(), eq(0));
 
     msg.optional_sint64_set(Some(7000));
-    assert_eq!(msg.optional_sint64_opt(), Optional::Set(7000));
+    assert_that!(msg.optional_sint64_opt(), eq(Optional::Set(7000)));
-    assert_eq!(msg.optional_sint64(), 7000);
+    assert_that!(msg.optional_sint64(), eq(7000));
 
     msg.optional_sint64_set(None);
-    assert_eq!(msg.optional_sint64_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_sint64_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_sint64(), 0);
+    assert_that!(msg.optional_sint64(), eq(0));
 }
 
 #[test]
 fn test_optional_uint32_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_uint32_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_uint32_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_uint32(), 0);
+    assert_that!(msg.optional_uint32(), eq(0));
 
     msg.optional_uint32_set(Some(9001));
-    assert_eq!(msg.optional_uint32_opt(), Optional::Set(9001));
+    assert_that!(msg.optional_uint32_opt(), eq(Optional::Set(9001)));
-    assert_eq!(msg.optional_uint32(), 9001);
+    assert_that!(msg.optional_uint32(), eq(9001));
 
     msg.optional_uint32_set(None);
-    assert_eq!(msg.optional_uint32_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_uint32_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_uint32(), 0);
+    assert_that!(msg.optional_uint32(), eq(0));
 }
 
 #[test]
 fn test_optional_uint64_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_uint64_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_uint64_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_uint64(), 0);
+    assert_that!(msg.optional_uint64(), eq(0));
 
     msg.optional_uint64_set(Some(42));
-    assert_eq!(msg.optional_uint64_opt(), Optional::Set(42));
+    assert_that!(msg.optional_uint64_opt(), eq(Optional::Set(42)));
-    assert_eq!(msg.optional_uint64(), 42);
+    assert_that!(msg.optional_uint64(), eq(42));
 
     msg.optional_uint64_set(None);
-    assert_eq!(msg.optional_uint64_opt(), Optional::Unset(0));
+    assert_that!(msg.optional_uint64_opt(), eq(Optional::Unset(0)));
-    assert_eq!(msg.optional_uint64(), 0);
+    assert_that!(msg.optional_uint64(), eq(0));
 }
 
 #[test]
 fn test_optional_float_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_float_opt(), Optional::Unset(0.0));
+    assert_that!(msg.optional_float_opt(), eq(Optional::Unset(0.0)));
-    assert_eq!(msg.optional_float(), 0.0);
+    assert_that!(msg.optional_float(), eq(0.0));
 
-    msg.optional_float_set(Some(3.14));
+    msg.optional_float_set(Some(std::f32::consts::PI));
-    assert_eq!(msg.optional_float_opt(), Optional::Set(3.14));
+    assert_that!(msg.optional_float_opt(), eq(Optional::Set(std::f32::consts::PI)));
-    assert_eq!(msg.optional_float(), 3.14);
+    assert_that!(msg.optional_float(), eq(std::f32::consts::PI));
 
     msg.optional_float_set(None);
-    assert_eq!(msg.optional_float_opt(), Optional::Unset(0.0));
+    assert_that!(msg.optional_float_opt(), eq(Optional::Unset(0.0)));
-    assert_eq!(msg.optional_float(), 0.0);
+    assert_that!(msg.optional_float(), eq(0.0));
 }
 
 #[test]
 fn test_optional_double_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_double_opt(), Optional::Unset(0.0));
+    assert_that!(msg.optional_double_opt(), eq(Optional::Unset(0.0)));
-    assert_eq!(msg.optional_double(), 0.0);
+    assert_that!(msg.optional_double(), eq(0.0));
 
     msg.optional_double_set(Some(-10.99));
-    assert_eq!(msg.optional_double_opt(), Optional::Set(-10.99));
+    assert_that!(msg.optional_double_opt(), eq(Optional::Set(-10.99)));
-    assert_eq!(msg.optional_double(), -10.99);
+    assert_that!(msg.optional_double(), eq(-10.99));
 
     msg.optional_double_set(None);
-    assert_eq!(msg.optional_double_opt(), Optional::Unset(0.0));
+    assert_that!(msg.optional_double_opt(), eq(Optional::Unset(0.0)));
-    assert_eq!(msg.optional_double(), 0.0);
+    assert_that!(msg.optional_double(), eq(0.0));
 }
 
 #[test]
 fn test_optional_bool_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_bool_opt(), Optional::Unset(false));
+    assert_that!(msg.optional_bool_opt(), eq(Optional::Unset(false)));
 
     msg.optional_bool_set(Some(true));
-    assert_eq!(msg.optional_bool_opt(), Optional::Set(true));
+    assert_that!(msg.optional_bool_opt(), eq(Optional::Set(true)));
 
     msg.optional_bool_set(None);
-    assert_eq!(msg.optional_bool_opt(), Optional::Unset(false));
+    assert_that!(msg.optional_bool_opt(), eq(Optional::Unset(false)));
 }
 
 #[test]
 fn test_optional_bytes_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_bytes(), b"");
+    assert_that!(msg.optional_bytes(), eq(b""));
-    assert_eq!(msg.optional_bytes_opt(), Optional::Unset(&b""[..]));
+    assert_that!(msg.optional_bytes_opt(), eq(Optional::Unset(&b""[..])));
-    assert_eq!(msg.optional_bytes_mut().get(), b"");
+    assert_that!(msg.optional_bytes_mut().get(), eq(b""));
-    assert!(msg.optional_bytes_mut().is_unset());
+    assert_that!(msg.optional_bytes_mut().is_unset(), eq(true));
 
     {
         let s = Vec::from(&b"hello world"[..]);
         msg.optional_bytes_mut().set(&s[..]);
     }
-    assert_eq!(msg.optional_bytes(), b"hello world");
+    assert_that!(msg.optional_bytes(), eq(b"hello world"));
-    assert_eq!(msg.optional_bytes_opt(), Optional::Set(&b"hello world"[..]));
+    assert_that!(msg.optional_bytes_opt(), eq(Optional::Set(&b"hello world"[..])));
-    assert!(msg.optional_bytes_mut().is_set());
+    assert_that!(msg.optional_bytes_mut().is_set(), eq(true));
-    assert_eq!(msg.optional_bytes_mut().get(), b"hello world");
+    assert_that!(msg.optional_bytes_mut().get(), eq(b"hello world"));
 
     msg.optional_bytes_mut().or_default().set(b"accessors_test");
-    assert_eq!(msg.optional_bytes(), b"accessors_test");
+    assert_that!(msg.optional_bytes(), eq(b"accessors_test"));
-    assert_eq!(msg.optional_bytes_opt(), Optional::Set(&b"accessors_test"[..]));
+    assert_that!(msg.optional_bytes_opt(), eq(Optional::Set(&b"accessors_test"[..])));
-    assert!(msg.optional_bytes_mut().is_set());
+    assert_that!(msg.optional_bytes_mut().is_set(), eq(true));
-    assert_eq!(msg.optional_bytes_mut().get(), b"accessors_test");
+    assert_that!(msg.optional_bytes_mut().get(), eq(b"accessors_test"));
-    assert_eq!(msg.optional_bytes_mut().or_default().get(), b"accessors_test");
+    assert_that!(msg.optional_bytes_mut().or_default().get(), eq(b"accessors_test"));
 
     msg.optional_bytes_mut().clear();
-    assert_eq!(msg.optional_bytes(), b"");
+    assert_that!(msg.optional_bytes(), eq(b""));
-    assert_eq!(msg.optional_bytes_opt(), Optional::Unset(&b""[..]));
+    assert_that!(msg.optional_bytes_opt(), eq(Optional::Unset(&b""[..])));
-    assert!(msg.optional_bytes_mut().is_unset());
+    assert_that!(msg.optional_bytes_mut().is_unset(), eq(true));
 
     msg.optional_bytes_mut().set(b"");
-    assert_eq!(msg.optional_bytes(), b"");
+    assert_that!(msg.optional_bytes(), eq(b""));
-    assert_eq!(msg.optional_bytes_opt(), Optional::Set(&b""[..]));
+    assert_that!(msg.optional_bytes_opt(), eq(Optional::Set(&b""[..])));
 
     msg.optional_bytes_mut().clear();
     msg.optional_bytes_mut().or_default();
-    assert_eq!(msg.optional_bytes(), b"");
+    assert_that!(msg.optional_bytes(), eq(b""));
-    assert_eq!(msg.optional_bytes_opt(), Optional::Set(&b""[..]));
+    assert_that!(msg.optional_bytes_opt(), eq(Optional::Set(&b""[..])));
 
     msg.optional_bytes_mut().or_default().set(b"\xffbinary\x85non-utf8");
-    assert_eq!(msg.optional_bytes(), b"\xffbinary\x85non-utf8");
+    assert_that!(msg.optional_bytes(), eq(b"\xffbinary\x85non-utf8"));
-    assert_eq!(msg.optional_bytes_opt(), Optional::Set(&b"\xffbinary\x85non-utf8"[..]));
+    assert_that!(msg.optional_bytes_opt(), eq(Optional::Set(&b"\xffbinary\x85non-utf8"[..])));
-    assert!(msg.optional_bytes_mut().is_set());
+    assert_that!(msg.optional_bytes_mut().is_set(), eq(true));
-    assert_eq!(msg.optional_bytes_mut().get(), b"\xffbinary\x85non-utf8");
+    assert_that!(msg.optional_bytes_mut().get(), eq(b"\xffbinary\x85non-utf8"));
-    assert_eq!(msg.optional_bytes_mut().or_default().get(), b"\xffbinary\x85non-utf8");
+    assert_that!(msg.optional_bytes_mut().or_default().get(), eq(b"\xffbinary\x85non-utf8"));
 }
 
 #[test]
 fn test_nonempty_default_bytes_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.default_bytes(), b"world");
+    assert_that!(msg.default_bytes(), eq(b"world"));
-    assert_eq!(msg.default_bytes_opt(), Optional::Unset(&b"world"[..]));
+    assert_that!(msg.default_bytes_opt(), eq(Optional::Unset(&b"world"[..])));
-    assert_eq!(msg.default_bytes_mut().get(), b"world");
+    assert_that!(msg.default_bytes_mut().get(), eq(b"world"));
-    assert!(msg.default_bytes_mut().is_unset());
+    assert_that!(msg.default_bytes_mut().is_unset(), eq(true));
 
     {
         let s = String::from("hello world");
         msg.default_bytes_mut().set(s.as_bytes());
     }
-    assert_eq!(msg.default_bytes(), b"hello world");
+    assert_that!(msg.default_bytes(), eq(b"hello world"));
-    assert_eq!(msg.default_bytes_opt(), Optional::Set(&b"hello world"[..]));
+    assert_that!(msg.default_bytes_opt(), eq(Optional::Set(&b"hello world"[..])));
-    assert!(msg.default_bytes_mut().is_set());
+    assert_that!(msg.default_bytes_mut().is_set(), eq(true));
-    assert_eq!(msg.default_bytes_mut().get(), b"hello world");
+    assert_that!(msg.default_bytes_mut().get(), eq(b"hello world"));
 
     msg.default_bytes_mut().or_default().set(b"accessors_test");
-    assert_eq!(msg.default_bytes(), b"accessors_test");
+    assert_that!(msg.default_bytes(), eq(b"accessors_test"));
-    assert_eq!(msg.default_bytes_opt(), Optional::Set(&b"accessors_test"[..]));
+    assert_that!(msg.default_bytes_opt(), eq(Optional::Set(&b"accessors_test"[..])));
-    assert!(msg.default_bytes_mut().is_set());
+    assert_that!(msg.default_bytes_mut().is_set(), eq(true));
-    assert_eq!(msg.default_bytes_mut().get(), b"accessors_test");
+    assert_that!(msg.default_bytes_mut().get(), eq(b"accessors_test"));
-    assert_eq!(msg.default_bytes_mut().or_default().get(), b"accessors_test");
+    assert_that!(msg.default_bytes_mut().or_default().get(), eq(b"accessors_test"));
 
     msg.default_bytes_mut().clear();
-    assert_eq!(msg.default_bytes(), b"world");
+    assert_that!(msg.default_bytes(), eq(b"world"));
-    assert_eq!(msg.default_bytes_opt(), Optional::Unset(&b"world"[..]));
+    assert_that!(msg.default_bytes_opt(), eq(Optional::Unset(&b"world"[..])));
-    assert!(msg.default_bytes_mut().is_unset());
+    assert_that!(msg.default_bytes_mut().is_unset(), eq(true));
 
     msg.default_bytes_mut().set(b"");
-    assert_eq!(msg.default_bytes(), b"");
+    assert_that!(msg.default_bytes(), eq(b""));
-    assert_eq!(msg.default_bytes_opt(), Optional::Set(&b""[..]));
+    assert_that!(msg.default_bytes_opt(), eq(Optional::Set(&b""[..])));
 
     msg.default_bytes_mut().clear();
     msg.default_bytes_mut().or_default();
-    assert_eq!(msg.default_bytes(), b"world");
+    assert_that!(msg.default_bytes(), eq(b"world"));
-    assert_eq!(msg.default_bytes_opt(), Optional::Set(&b"world"[..]));
+    assert_that!(msg.default_bytes_opt(), eq(Optional::Set(&b"world"[..])));
 
     msg.default_bytes_mut().or_default().set(b"\xffbinary\x85non-utf8");
-    assert_eq!(msg.default_bytes(), b"\xffbinary\x85non-utf8");
+    assert_that!(msg.default_bytes(), eq(b"\xffbinary\x85non-utf8"));
-    assert_eq!(msg.default_bytes_opt(), Optional::Set(&b"\xffbinary\x85non-utf8"[..]));
+    assert_that!(msg.default_bytes_opt(), eq(Optional::Set(&b"\xffbinary\x85non-utf8"[..])));
-    assert!(msg.default_bytes_mut().is_set());
+    assert_that!(msg.default_bytes_mut().is_set(), eq(true));
-    assert_eq!(msg.default_bytes_mut().get(), b"\xffbinary\x85non-utf8");
+    assert_that!(msg.default_bytes_mut().get(), eq(b"\xffbinary\x85non-utf8"));
-    assert_eq!(msg.default_bytes_mut().or_default().get(), b"\xffbinary\x85non-utf8");
+    assert_that!(msg.default_bytes_mut().or_default().get(), eq(b"\xffbinary\x85non-utf8"));
 }
 
 #[test]
 fn test_optional_string_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.optional_string(), "");
+    assert_that!(msg.optional_string(), eq(""));
-    assert_eq!(msg.optional_string_opt(), Optional::Unset("".into()));
+    assert_that!(msg.optional_string_opt(), eq(Optional::Unset("".into())));
-    assert_eq!(msg.optional_string_mut().get(), "");
+    assert_that!(msg.optional_string_mut().get(), eq(""));
-    assert!(msg.optional_string_mut().is_unset());
+    assert_that!(msg.optional_string_mut().is_unset(), eq(true));
 
     {
         let s = String::from("hello world");
         msg.optional_string_mut().set(&s[..]);
     }
-    assert_eq!(msg.optional_string(), "hello world");
+    assert_that!(msg.optional_string(), eq("hello world"));
-    assert_eq!(msg.optional_string_opt(), Optional::Set("hello world".into()));
+    assert_that!(msg.optional_string_opt(), eq(Optional::Set("hello world".into())));
-    assert!(msg.optional_string_mut().is_set());
+    assert_that!(msg.optional_string_mut().is_set(), eq(true));
-    assert_eq!(msg.optional_string_mut().get(), "hello world");
+    assert_that!(msg.optional_string_mut().get(), eq("hello world"));
 
     msg.optional_string_mut().or_default().set("accessors_test");
-    assert_eq!(msg.optional_string(), "accessors_test");
+    assert_that!(msg.optional_string(), eq("accessors_test"));
-    assert_eq!(msg.optional_string_opt(), Optional::Set("accessors_test".into()));
+    assert_that!(msg.optional_string_opt(), eq(Optional::Set("accessors_test".into())));
-    assert!(msg.optional_string_mut().is_set());
+    assert_that!(msg.optional_string_mut().is_set(), eq(true));
-    assert_eq!(msg.optional_string_mut().get(), "accessors_test");
+    assert_that!(msg.optional_string_mut().get(), eq("accessors_test"));
-    assert_eq!(msg.optional_string_mut().or_default().get(), "accessors_test");
+    assert_that!(msg.optional_string_mut().or_default().get(), eq("accessors_test"));
 
     msg.optional_string_mut().clear();
-    assert_eq!(msg.optional_string(), "");
+    assert_that!(msg.optional_string(), eq(""));
-    assert_eq!(msg.optional_string_opt(), Optional::Unset("".into()));
+    assert_that!(msg.optional_string_opt(), eq(Optional::Unset("".into())));
-    assert!(msg.optional_string_mut().is_unset());
+    assert_that!(msg.optional_string_mut().is_unset(), eq(true));
 
     msg.optional_string_mut().set("");
-    assert_eq!(msg.optional_string(), "");
+    assert_that!(msg.optional_string(), eq(""));
-    assert_eq!(msg.optional_string_opt(), Optional::Set("".into()));
+    assert_that!(msg.optional_string_opt(), eq(Optional::Set("".into())));
 
     msg.optional_string_mut().clear();
     msg.optional_string_mut().or_default();
-    assert_eq!(msg.optional_string(), "");
+    assert_that!(msg.optional_string(), eq(""));
-    assert_eq!(msg.optional_string_opt(), Optional::Set("".into()));
+    assert_that!(msg.optional_string_opt(), eq(Optional::Set("".into())));
 }
 
 #[test]
 fn test_nonempty_default_string_accessors() {
     let mut msg = TestAllTypes::new();
-    assert_eq!(msg.default_string(), "hello");
+    assert_that!(msg.default_string(), eq("hello"));
-    assert_eq!(msg.default_string_opt(), Optional::Unset("hello".into()));
+    assert_that!(msg.default_string_opt(), eq(Optional::Unset("hello".into())));
-    assert_eq!(msg.default_string_mut().get(), "hello");
+    assert_that!(msg.default_string_mut().get(), eq("hello"));
-    assert!(msg.default_string_mut().is_unset());
+    assert_that!(msg.default_string_mut().is_unset(), eq(true));
 
     {
         let s = String::from("hello world");
         msg.default_string_mut().set(&s[..]);
     }
-    assert_eq!(msg.default_string(), "hello world");
+    assert_that!(msg.default_string(), eq("hello world"));
-    assert_eq!(msg.default_string_opt(), Optional::Set("hello world".into()));
+    assert_that!(msg.default_string_opt(), eq(Optional::Set("hello world".into())));
-    assert!(msg.default_string_mut().is_set());
+    assert_that!(msg.default_string_mut().is_set(), eq(true));
-    assert_eq!(msg.default_string_mut().get(), "hello world");
+    assert_that!(msg.default_string_mut().get(), eq("hello world"));
 
     msg.default_string_mut().or_default().set("accessors_test");
-    assert_eq!(msg.default_string(), "accessors_test");
+    assert_that!(msg.default_string(), eq("accessors_test"));
-    assert_eq!(msg.default_string_opt(), Optional::Set("accessors_test".into()));
+    assert_that!(msg.default_string_opt(), eq(Optional::Set("accessors_test".into())));
-    assert!(msg.default_string_mut().is_set());
+    assert_that!(msg.default_string_mut().is_set(), eq(true));
-    assert_eq!(msg.default_string_mut().get(), "accessors_test");
+    assert_that!(msg.default_string_mut().get(), eq("accessors_test"));
-    assert_eq!(msg.default_string_mut().or_default().get(), "accessors_test");
+    assert_that!(msg.default_string_mut().or_default().get(), eq("accessors_test"));
 
     msg.default_string_mut().clear();
-    assert_eq!(msg.default_string(), "hello");
+    assert_that!(msg.default_string(), eq("hello"));
-    assert_eq!(msg.default_string_opt(), Optional::Unset("hello".into()));
+    assert_that!(msg.default_string_opt(), eq(Optional::Unset("hello".into())));
-    assert!(msg.default_string_mut().is_unset());
+    assert_that!(msg.default_string_mut().is_unset(), eq(true));
 
     msg.default_string_mut().set("");
-    assert_eq!(msg.default_string(), "");
+    assert_that!(msg.default_string(), eq(""));
-    assert_eq!(msg.default_string_opt(), Optional::Set("".into()));
+    assert_that!(msg.default_string_opt(), eq(Optional::Set("".into())));
 
     msg.default_string_mut().clear();
     msg.default_string_mut().or_default();
-    assert_eq!(msg.default_string(), "hello");
+    assert_that!(msg.default_string(), eq("hello"));
-    assert_eq!(msg.default_string_opt(), Optional::Set("hello".into()));
+    assert_that!(msg.default_string_opt(), eq(Optional::Set("hello".into())));
 }
 
 #[test]
@@ -376,19 +380,20 @@ fn test_oneof_accessors() {
     use TestAllTypes_::OneofField::*;
 
     let mut msg = TestAllTypes::new();
-    assert!(matches!(msg.oneof_field(), not_set(_)));
+    assert_that!(msg.oneof_field(), matches_pattern!(not_set(_)));
 
     msg.oneof_uint32_set(Some(7));
-    assert_eq!(msg.oneof_uint32_opt(), Optional::Set(7));
+    assert_that!(msg.oneof_uint32_opt(), eq(Optional::Set(7)));
-    assert!(matches!(msg.oneof_field(), OneofUint32(7)));
+    assert_that!(msg.oneof_field(), matches_pattern!(OneofUint32(eq(7))));
 
     msg.oneof_uint32_set(None);
-    assert_eq!(msg.oneof_uint32_opt(), Optional::Unset(0));
+    assert_that!(msg.oneof_uint32_opt(), eq(Optional::Unset(0)));
-    assert!(matches!(msg.oneof_field(), not_set(_)));
+    assert_that!(msg.oneof_field(), matches_pattern!(not_set(_)));
 
     msg.oneof_uint32_set(Some(7));
     msg.oneof_bytes_mut().set(b"");
-    assert_eq!(msg.oneof_uint32_opt(), Optional::Unset(0));
+    assert_that!(msg.oneof_uint32_opt(), eq(Optional::Unset(0)));
+
     // This should show it set to the OneofBytes but its not supported yet.
-    assert!(matches!(msg.oneof_field(), not_set(_)));
+    assert_that!(msg.oneof_field(), matches_pattern!(not_set(_)));
 }