1 files changed, 131 insertions, 0 deletions
diff --git a/xpcom/rust/nsstring/gtest/Test.cpp b/xpcom/rust/nsstring/gtest/Test.cpp
new file mode 100644
index 000000000..93d2ee1d7
--- /dev/null
+++ b/xpcom/rust/nsstring/gtest/Test.cpp
@@ -0,0 +1,131 @@
+#include "gtest/gtest.h"
+#include <stdint.h>
+#include "nsString.h"
+
+extern "C" {
+  // This function is called by the rust code in test.rs if a non-fatal test
+  // failure occurs.
+  void GTest_ExpectFailure(const char* aMessage) {
+    EXPECT_STREQ(aMessage, "");
+  }
+}
+
+#define SIZE_ALIGN_CHECK(Clazz)                                         \
+  extern "C" void Rust_Test_ReprSizeAlign_##Clazz(size_t* size, size_t* align); \
+  TEST(RustNsString, ReprSizeAlign_##Clazz) {                           \
+    size_t size, align;                                                 \
+    Rust_Test_ReprSizeAlign_##Clazz(&size, &align);                     \
+    EXPECT_EQ(size, sizeof(Clazz));                                     \
+    EXPECT_EQ(align, alignof(Clazz));                                   \
+  }
+
+SIZE_ALIGN_CHECK(nsString)
+SIZE_ALIGN_CHECK(nsCString)
+SIZE_ALIGN_CHECK(nsFixedString)
+SIZE_ALIGN_CHECK(nsFixedCString)
+
+#define MEMBER_CHECK(Clazz, Member)                                     \
+  extern "C" void Rust_Test_Member_##Clazz##_##Member(size_t* size,     \
+                                                      size_t* align,    \
+                                                      size_t* offset);  \
+  TEST(RustNsString, ReprMember_##Clazz##_##Member) {                   \
+    class Hack : public Clazz {                                         \
+    public:                                                             \
+      static void RunTest() {                                           \
+        size_t size, align, offset;                                     \
+        Rust_Test_Member_##Clazz##_##Member(&size, &align, &offset);    \
+        EXPECT_EQ(size, sizeof(mozilla::DeclVal<Hack>().Member));       \
+        EXPECT_EQ(size, alignof(decltype(mozilla::DeclVal<Hack>().Member))); \
+        EXPECT_EQ(offset, offsetof(Hack, Member));                      \
+      }                                                                 \
+    };                                                                  \
+    static_assert(sizeof(Clazz) == sizeof(Hack), "Hack matches class"); \
+    Hack::RunTest();                                                    \
+  }
+
+MEMBER_CHECK(nsString, mData)
+MEMBER_CHECK(nsString, mLength)
+MEMBER_CHECK(nsString, mFlags)
+MEMBER_CHECK(nsCString, mData)
+MEMBER_CHECK(nsCString, mLength)
+MEMBER_CHECK(nsCString, mFlags)
+MEMBER_CHECK(nsFixedString, mFixedCapacity)
+MEMBER_CHECK(nsFixedString, mFixedBuf)
+MEMBER_CHECK(nsFixedCString, mFixedCapacity)
+MEMBER_CHECK(nsFixedCString, mFixedBuf)
+
+extern "C" void Rust_Test_NsStringFlags(uint32_t* f_none,
+                                        uint32_t* f_terminated,
+                                        uint32_t* f_voided,
+                                        uint32_t* f_shared,
+                                        uint32_t* f_owned,
+                                        uint32_t* f_fixed,
+                                        uint32_t* f_literal,
+                                        uint32_t* f_class_fixed);
+TEST(RustNsString, NsStringFlags) {
+  uint32_t f_none, f_terminated, f_voided, f_shared, f_owned, f_fixed, f_literal, f_class_fixed;
+  Rust_Test_NsStringFlags(&f_none, &f_terminated,
+                          &f_voided, &f_shared,
+                          &f_owned, &f_fixed,
+                          &f_literal, &f_class_fixed);
+  EXPECT_EQ(f_none, nsAString::F_NONE);
+  EXPECT_EQ(f_none, nsACString::F_NONE);
+  EXPECT_EQ(f_terminated, nsAString::F_TERMINATED);
+  EXPECT_EQ(f_terminated, nsACString::F_TERMINATED);
+  EXPECT_EQ(f_voided, nsAString::F_VOIDED);
+  EXPECT_EQ(f_voided, nsACString::F_VOIDED);
+  EXPECT_EQ(f_shared, nsAString::F_SHARED);
+  EXPECT_EQ(f_shared, nsACString::F_SHARED);
+  EXPECT_EQ(f_owned, nsAString::F_OWNED);
+  EXPECT_EQ(f_owned, nsACString::F_OWNED);
+  EXPECT_EQ(f_fixed, nsAString::F_FIXED);
+  EXPECT_EQ(f_fixed, nsACString::F_FIXED);
+  EXPECT_EQ(f_literal, nsAString::F_LITERAL);
+  EXPECT_EQ(f_literal, nsACString::F_LITERAL);
+  EXPECT_EQ(f_class_fixed, nsAString::F_CLASS_FIXED);
+  EXPECT_EQ(f_class_fixed, nsACString::F_CLASS_FIXED);
+}
+
+extern "C" void Rust_StringFromCpp(const nsACString* aCStr, const nsAString* aStr);
+TEST(RustNsString, StringFromCpp) {
+  nsAutoCString foo;
+  foo.AssignASCII("Hello, World!");
+
+  nsAutoString bar;
+  bar.AssignASCII("Hello, World!");
+
+  Rust_StringFromCpp(&foo, &bar);
+}
+
+extern "C" void Rust_AssignFromRust(nsACString* aCStr, nsAString* aStr);
+TEST(RustNsString, AssignFromRust) {
+  nsAutoCString cs;
+  nsAutoString s;
+  Rust_AssignFromRust(&cs, &s);
+  EXPECT_TRUE(cs.EqualsASCII("Hello, World!"));
+  EXPECT_TRUE(s.EqualsASCII("Hello, World!"));
+}
+
+extern "C" {
+  void Cpp_AssignFromCpp(nsACString* aCStr, nsAString* aStr) {
+    aCStr->AssignASCII("Hello, World!");
+    aStr->AssignASCII("Hello, World!");
+  }
+}
+extern "C" void Rust_AssignFromCpp();
+TEST(RustNsString, AssignFromCpp) {
+  Rust_AssignFromCpp();
+}
+extern "C" void Rust_FixedAssignFromCpp();
+TEST(RustNsString, FixedAssignFromCpp) {
+  Rust_FixedAssignFromCpp();
+}
+extern "C" void Rust_AutoAssignFromCpp();
+TEST(RustNsString, AutoAssignFromCpp) {
+  Rust_AutoAssignFromCpp();
+}
+
+extern "C" void Rust_StringWrite();
+TEST(RustNsString, StringWrite) {
+  Rust_StringWrite();
+}