test: add curl features check (envoyproxy#8194)

Add a test ensuring curl was built with the expected features.

Description: Add a test ensuring curl was built with the expected features.
Risk Level: Low.
Testing: n/a.
Docs Changes: n/a.
Release Notes: n/a.

Signed-off-by: Taras Roshko <troshko@netflix.com>

test/dependencies/BUILD

@@ -0,0 +1,17 @@
+licenses(["notice"])  # Apache 2
+
+load(
+    "//bazel:envoy_build_system.bzl",
+    "envoy_cc_test",
+    "envoy_package",
+)
+
+envoy_package()
+
+envoy_cc_test(
+    name = "curl_test",
+    srcs = ["curl_test.cc"],
+    external_deps = [
+        "curl",
+    ],
+)

test/dependencies/curl_test.cc

@@ -0,0 +1,32 @@
+#include "curl/curl.h"
+#include "gtest/gtest.h"
+
+namespace Envoy {
+namespace Dependencies {
+
+TEST(CurlTest, BuiltWithExpectedFeatures) {
+  // Ensure built with the expected features, flags from
+  // https://curl.haxx.se/libcurl/c/curl_version_info.html.
+  curl_version_info_data* info = curl_version_info(CURLVERSION_NOW);
+
+  EXPECT_NE(0, info->features & CURL_VERSION_ASYNCHDNS);
+  EXPECT_NE(0, info->ares_num);
+  EXPECT_NE(0, info->features & CURL_VERSION_HTTP2);
+  EXPECT_NE(0, info->features & CURL_VERSION_LIBZ);
+  EXPECT_NE(0, info->features & CURL_VERSION_IPV6);
+  EXPECT_NE(0, info->features & CURL_VERSION_UNIX_SOCKETS);
+
+  EXPECT_EQ(0, info->features & CURL_VERSION_BROTLI);
+  EXPECT_EQ(0, info->features & CURL_VERSION_GSSAPI);
+  EXPECT_EQ(0, info->features & CURL_VERSION_GSSNEGOTIATE);
+  EXPECT_EQ(0, info->features & CURL_VERSION_KERBEROS4);
+  EXPECT_EQ(0, info->features & CURL_VERSION_KERBEROS5);
+  EXPECT_EQ(0, info->features & CURL_VERSION_NTLM);
+  EXPECT_EQ(0, info->features & CURL_VERSION_NTLM_WB);
+  EXPECT_EQ(0, info->features & CURL_VERSION_SPNEGO);
+  EXPECT_EQ(0, info->features & CURL_VERSION_SSL);
+  EXPECT_EQ(0, info->features & CURL_VERSION_SSPI);
+}
+
+} // namespace Dependencies
+} // namespace Envoy