Addressing failing tests on Windows(get_host_socket_spec_port() and socket_spec_connect()) as well
as assorted legacy failures on Mac.

Bug: 290119691

Test: Ran adbd_test on Windows 10 Enterprise, Mac M1 and Linux hosts
  - Windows: nativetest\adb_test>.\adb_test.exe
    Running main() from external/googletest/googletest/src/gtest_main.cc
    [==========] Running 78 tests from 16 test suites.
    <snip>
    [----------] 8 tests from AdbListenersTest (304 ms total)
    [----------] Global test environment tear-down
    [==========] 76 tests from 16 test suites ran. (152379 ms total)
    [  PASSED  ] 75 tests.
    [  SKIPPED  ]  1 test, listed below:
    [  SKIPPED  ]  adb_utils.directory_exisits_win32_symlink_junction

        YOU HAVE 8 DISABLED TESTS
  - Mac M1:
    $ out/host/darwin-x86/nativetest64/adb_test/adb_test
    <snip>
    [----------] Global test environment tear-down
    [==========] 86 tests from 17 test suites ran. (34901 ms total)
    [  PASSED  ] 82 tests.
    [  SKIPPED ]  3 tests, listed below:
    [  SKIPPED ]  io.WriteFdExactly_ENOSPC
    [  SKIPPED ]  socket_spec.get_host_socket_spec_port_vsock_success
    [  SKIPPED  ] sysdeps_poll.duplicate_fd
    [  FAILED  ]  1 test, listed below:
    [  FAILED  ]  FdeventTest.timeout

        1 FAILED TEST
  - Linux: aosp-master-with-phones$ out/host/linux-x86/nativetest64/adb_test/adb_test
    <snip>
    [----------] Global test environment tear-down
    [==========] 87 tests from 17 test suites ran. (15584 ms total)
    [  PASSED  ] 87 tests.

Change-Id: I2989cf18b4aa77591852d2813a2ec1b274cd40cd
diff --git a/socket_spec_test.cpp b/socket_spec_test.cpp
index a4b73c4..4c976a3 100644
--- a/socket_spec_test.cpp
+++ b/socket_spec_test.cpp
@@ -172,7 +172,15 @@
     EXPECT_EQ(5555, get_host_socket_spec_port("tcp:5555", &error));
     EXPECT_EQ(5555, get_host_socket_spec_port("tcp:localhost:5555", &error));
     EXPECT_EQ(5555, get_host_socket_spec_port("tcp:[::1]:5555", &error));
+}
+
+TEST(socket_spec, get_host_socket_spec_port_vsock_success) {
+    std::string error;
+#ifdef __linux__  // vsock is only supported on linux
     EXPECT_EQ(5555, get_host_socket_spec_port("vsock:5555", &error));
+#else
+    GTEST_SKIP() << "vsock is only supported on linux";
+#endif
 }
 
 TEST(socket_spec, get_host_socket_spec_port_no_port) {
@@ -185,6 +193,9 @@
     std::string error;
     EXPECT_EQ(-1, get_host_socket_spec_port("tcp:65536", &error));
     EXPECT_EQ(-1, get_host_socket_spec_port("tcp:-5", &error));
+
+    // The following two expectations happen to fail on non-linux anyway(for
+    // different reasons than "vsock is only supported on linux").
     EXPECT_EQ(-1, get_host_socket_spec_port("vsock:-5", &error));
     EXPECT_EQ(-1, get_host_socket_spec_port("vsock:5:5555", &error));
 }
@@ -234,6 +245,7 @@
                 android::base::StringPrintf("localfilesystem:%s/af_unix_socket", sock_dir.path);
         EXPECT_FALSE(socket_spec_connect(&client_fd, sock_addr, &port, &serial, &error));
         server_fd.reset(socket_spec_listen(sock_addr, &error, &port));
+
         EXPECT_NE(server_fd.get(), -1);
         EXPECT_TRUE(socket_spec_connect(&client_fd, sock_addr, &port, &serial, &error));
         EXPECT_NE(client_fd.get(), -1);