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// Test must include gtest before import std to avoid GCC module redefinition errors

#include <gtest/gtest.h>

import mcpplibs.tinyhttps;

import std;

namespace https = mcpplibs::tinyhttps;

TEST(ChunkedProtocol, RejectsEmptyInvalidAndOverflowSizeLines) {

EXPECT_FALSE(https::parse_chunk_size_line("").has_value());

EXPECT_FALSE(https::parse_chunk_size_line("xyz").has_value());

EXPECT_FALSE(https::parse_chunk_size_line("1g").has_value());

EXPECT_FALSE(https::parse_chunk_size_line("FFFFFFFFFFFFFFFF").has_value());

}

TEST(ChunkedProtocol, AcceptsValidSizeAndTerminalChunk) {

ASSERT_TRUE(https::parse_chunk_size_line("1a").has_value());

EXPECT_EQ(*https::parse_chunk_size_line("1a"), 26);

ASSERT_TRUE(https::parse_chunk_size_line("0").has_value());

EXPECT_EQ(*https::parse_chunk_size_line("0"), 0);

}

TEST(DownloadResultContract, CarriesTransferAndResponseMetadata) {

https::DownloadToFileResult result;

result.bytesWritten = 42;

result.expectedBytes = 42;

result.finalUrl = "https://example.test/final";

result.etag = "\"abc\"";

result.lastModified = "Wed, 21 Oct 2015 07:28:00 GMT";

EXPECT_EQ(result.bytesWritten, 42);

ASSERT_TRUE(result.expectedBytes.has_value());

EXPECT_EQ(*result.expectedBytes, 42);

EXPECT_EQ(result.finalUrl, "https://example.test/final");

EXPECT_EQ(result.etag, "\"abc\"");

EXPECT_FALSE(result.lastModified.empty());

}

// Test download_to_file against a real HTTPS endpoint.

// Uses httpbin.org which returns known-size responses.

class DownloadToFileTest : public ::testing::Test {

protected:

std::filesystem::path tmpDir;

void SetUp() override {

https::Socket::platform_init();

tmpDir = std::filesystem::temp_directory_path() / "tinyhttps_test";

std::filesystem::create_directories(tmpDir);

}

void TearDown() override {

std::error_code ec;

std::filesystem::remove_all(tmpDir, ec);

}

};

TEST_F(DownloadToFileTest, BasicDownloadWithProgress) {

https::HttpClientConfig cfg;

cfg.connectTimeoutMs = 15000;

cfg.readTimeoutMs = 30000;

cfg.keepAlive = false;

https::HttpClient client(cfg);

auto dest = tmpDir / "test_100bytes.bin";

std::int64_t lastTotal = -1;

std::int64_t lastDownloaded = -1;

int callCount = 0;

auto result = client.download_to_file(

"https://httpbin.org/bytes/100",

dest,

[&](std::int64_t total, std::int64_t downloaded) {

lastTotal = total;

lastDownloaded = downloaded;

++callCount;

}

);

ASSERT_TRUE(result.ok()) << "Error: " << result.error;

EXPECT_EQ(result.statusCode, 200);

EXPECT_EQ(result.bytesWritten, 100);

EXPECT_TRUE(std::filesystem::exists(dest));

EXPECT_EQ(std::filesystem::file_size(dest), 100u);

EXPECT_GT(callCount, 0) << "Progress callback should be called at least once";

EXPECT_EQ(lastDownloaded, 100);

EXPECT_EQ(lastTotal, 100);

}

TEST_F(DownloadToFileTest, ProgressIncrementsMonotonically) {

https::HttpClientConfig cfg;

cfg.connectTimeoutMs = 15000;

cfg.readTimeoutMs = 60000;

cfg.keepAlive = false;

https::HttpClient client(cfg);

auto dest = tmpDir / "test_50k.bin";

std::vector<std::int64_t> downloadedValues;

auto result = client.download_to_file(

"https://httpbin.org/bytes/51200",

dest,

[&](std::int64_t total, std::int64_t downloaded) {

(void)total;

downloadedValues.push_back(downloaded);

}

);

ASSERT_TRUE(result.ok()) << "Error: " << result.error;

EXPECT_EQ(result.bytesWritten, 51200);

// Progress must be monotonically increasing

for (std::size_t i = 1; i < downloadedValues.size(); ++i) {

EXPECT_GT(downloadedValues[i], downloadedValues[i - 1])

<< "Progress not monotonic at index " << i;

}

// Must have multiple progress calls for 50KB

EXPECT_GT(downloadedValues.size(), 1u)

<< "50KB download should report progress more than once";

}

TEST_F(DownloadToFileTest, FollowsRedirects) {

https::HttpClientConfig cfg;

cfg.connectTimeoutMs = 15000;

cfg.readTimeoutMs = 30000;

cfg.keepAlive = false;

https::HttpClient client(cfg);

auto dest = tmpDir / "redirected.bin";

// httpbin /redirect-to redirects to the given URL

auto result = client.download_to_file(

"https://httpbin.org/redirect-to?url=https%3A%2F%2Fhttpbin.org%2Fbytes%2F50",

dest

);

ASSERT_TRUE(result.ok()) << "Error: " << result.error;

EXPECT_EQ(result.bytesWritten, 50);

EXPECT_TRUE(std::filesystem::exists(dest));

}

TEST_F(DownloadToFileTest, NoProgressCallbackStillWorks) {

https::HttpClientConfig cfg;

cfg.connectTimeoutMs = 15000;

cfg.readTimeoutMs = 30000;

cfg.keepAlive = false;

https::HttpClient client(cfg);

auto dest = tmpDir / "no_progress.bin";

auto result = client.download_to_file(

"https://httpbin.org/bytes/200",

dest

);

ASSERT_TRUE(result.ok()) << "Error: " << result.error;

EXPECT_EQ(result.bytesWritten, 200);

}

TEST_F(DownloadToFileTest, Http404ReturnsError) {

https::HttpClientConfig cfg;

cfg.connectTimeoutMs = 15000;

cfg.readTimeoutMs = 30000;

cfg.keepAlive = false;

https::HttpClient client(cfg);

auto dest = tmpDir / "not_found.bin";

auto result = client.download_to_file(

"https://httpbin.org/status/404",

dest

);

EXPECT_FALSE(result.ok());

EXPECT_EQ(result.statusCode, 404);

}

TEST_F(DownloadToFileTest, TotalBytesKnownForContentLength) {

https::HttpClientConfig cfg;

cfg.connectTimeoutMs = 15000;

cfg.readTimeoutMs = 30000;

cfg.keepAlive = false;

https::HttpClient client(cfg);

auto dest = tmpDir / "known_size.bin";

std::int64_t reportedTotal = -1;

auto result = client.download_to_file(

"https://httpbin.org/bytes/1024",

dest,

[&](std::int64_t total, [[maybe_unused]] std::int64_t downloaded) {

if (reportedTotal < 0) reportedTotal = total;

}

);

ASSERT_TRUE(result.ok()) << "Error: " << result.error;

// httpbin /bytes/N returns Content-Length: N

EXPECT_EQ(reportedTotal, 1024);

}

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test_download.cpp

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