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<h1 class="page">Mock Stream Testing</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Unit testing protocol code with mock streams and error injection.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_what_you_will_learn"><a class="anchor" href="#_what_you_will_learn"></a>What You Will Learn</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Using <code>test::read_stream</code> and <code>test::write_stream</code></p>
</li>
<li>
<p>Error injection with <code>fuse</code></p>
</li>
<li>
<p>Synchronous testing with <code>run_blocking</code></p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_prerequisites"><a class="anchor" href="#_prerequisites"></a>Prerequisites</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Completed <a href="7c.buffer-composition.html" class="xref page">Buffer Composition</a></p>
</li>
<li>
<p>Understanding of streams from <a href="../6.streams/6b.streams.html" class="xref page">Streams</a></p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_source_code"><a class="anchor" href="#_source_code"></a>Source Code</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">#include &lt;boost/capy.hpp&gt;
#include &lt;boost/capy/test/stream.hpp&gt;
#include &lt;boost/capy/test/fuse.hpp&gt;
#include &lt;boost/capy/io/any_stream.hpp&gt;
#include &lt;boost/capy/cond.hpp&gt;
#include &lt;iostream&gt;
#include &lt;cassert&gt;
#include &lt;cctype&gt;
using namespace boost::capy;
// A simple protocol: read until newline, echo back uppercase
// Takes any_stream&amp; so the function is transport-independent
task&lt;bool&gt; echo_line_uppercase(any_stream&amp; stream)
{
std::string line;
char c;
// Read character by character until newline
while (true)
{
// ec: std::error_code, n: std::size_t
auto [ec, n] = co_await stream.read_some(mutable_buffer(&amp;c, 1));
if (ec)
{
if (ec == cond::eof)
break;
co_return false;
}
if (c == '\n')
break;
line += static_cast&lt;char&gt;(std::toupper(static_cast&lt;unsigned char&gt;(c)));
}
line += '\n';
// Echo uppercase - loop until all bytes written
std::size_t written = 0; // std::size_t - total bytes written
while (written &lt; line.size())
{
// wec: std::error_code, wn: std::size_t
auto [wec, wn] = co_await stream.write_some(
const_buffer(line.data() + written, line.size() - written));
if (wec)
co_return false;
written += wn;
}
co_return true;
}
void test_happy_path()
{
std::cout &lt;&lt; "Test: happy path\n";
// Use fuse in disarmed mode (no error injection) for happy path
test::fuse f; // test::fuse
test::stream mock(f); // test::stream
mock.provide("hello\n");
// Wrap mock in any_stream using pointer construction for reference semantics
any_stream stream{&amp;mock}; // any_stream
bool result = false; // bool
test::run_blocking([&amp;](bool r) { result = r; })(echo_line_uppercase(stream));
assert(result == true);
assert(mock.data() == "HELLO\n");
std::cout &lt;&lt; " PASSED\n";
}
void test_partial_reads()
{
std::cout &lt;&lt; "Test: partial reads (1 byte at a time)\n";
// Use fuse in disarmed mode (no error injection)
test::fuse f; // test::fuse
// Mock returns at most 1 byte per read_some
test::stream mock(f, 1); // test::stream, max_read_size = 1
mock.provide("hi\n");
// Wrap mock in any_stream using pointer construction for reference semantics
any_stream stream{&amp;mock}; // any_stream
bool result = false; // bool
test::run_blocking([&amp;](bool r) { result = r; })(echo_line_uppercase(stream));
assert(result == true);
assert(mock.data() == "HI\n");
std::cout &lt;&lt; " PASSED\n";
}
void test_with_error_injection()
{
std::cout &lt;&lt; "Test: error injection\n";
int success_count = 0;
int error_count = 0;
// fuse::armed runs the test repeatedly, failing at each
// operation point until all paths are covered
test::fuse f; // test::fuse
auto r = f.armed([&amp;](test::fuse&amp;) -&gt; task&lt;&gt; { // fuse::result
test::stream mock(f); // test::stream
mock.provide("test\n");
// Wrap mock in any_stream using pointer construction for reference semantics
any_stream stream{&amp;mock}; // any_stream
// Run the protocol - fuse will inject errors at each step
bool result = co_await echo_line_uppercase(stream); // bool
// Either succeeds with correct output, or fails cleanly
if (result)
{
++success_count;
assert(mock.data() == "TEST\n");
}
else
{
++error_count;
}
});
// Verify that fuse testing exercised both paths
std::cout &lt;&lt; " Runs: " &lt;&lt; (success_count + error_count)
&lt;&lt; " (success=" &lt;&lt; success_count
&lt;&lt; ", error=" &lt;&lt; error_count &lt;&lt; ")\n";
assert(r.success);
assert(success_count &gt; 0); // At least one successful run
assert(error_count &gt; 0); // At least one error-injected run
std::cout &lt;&lt; " PASSED (all error paths tested)\n";
}
int main()
{
test_happy_path();
test_partial_reads();
test_with_error_injection();
std::cout &lt;&lt; "\nAll tests passed!\n";
return 0;
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_build"><a class="anchor" href="#_build"></a>Build</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cmake hljs" data-lang="cmake">add_executable(mock_stream_testing mock_stream_testing.cpp)
target_link_libraries(mock_stream_testing PRIVATE capy)</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_walkthrough"><a class="anchor" href="#_walkthrough"></a>Walkthrough</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_mock_streams"><a class="anchor" href="#_mock_streams"></a>Mock Streams</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">test::fuse f; // test::fuse
test::stream mock(f); // test::stream
mock.provide("hello\n");</code></pre>
</div>
</div>
<div class="paragraph">
<p><code>test::stream</code> is a bidirectional mock that satisfies both <code>ReadStream</code> and <code>WriteStream</code>:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Constructor takes a <code>fuse&amp;</code> for error injection</p>
</li>
<li>
<p><code>provide(data)</code> — Supplies data for reads</p>
</li>
<li>
<p><code>data()</code> — Returns data written to the mock</p>
</li>
<li>
<p>Second constructor parameter controls max bytes per operation</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_type_erased_streams"><a class="anchor" href="#_type_erased_streams"></a>Type-Erased Streams</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">// Wrap mock in any_stream using pointer construction for reference semantics
any_stream stream{&amp;mock}; // any_stream</code></pre>
</div>
</div>
<div class="paragraph">
<p>Use pointer construction (<code>&amp;mock</code>) so the <code>any_stream</code> wrapper references the mock without taking ownership. This allows inspecting <code>mock.data()</code> after operations.</p>
</div>
</div>
<div class="sect2">
<h3 id="_synchronous_testing"><a class="anchor" href="#_synchronous_testing"></a>Synchronous Testing</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">bool result = false; // bool
test::run_blocking([&amp;](bool r) { result = r; })(echo_line_uppercase(stream));</code></pre>
</div>
</div>
<div class="paragraph">
<p><code>run_blocking</code> executes a coroutine synchronously, blocking until complete. Pass a handler to capture the result.</p>
</div>
</div>
<div class="sect2">
<h3 id="_error_injection"><a class="anchor" href="#_error_injection"></a>Error Injection</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">test::fuse f; // test::fuse
auto r = f.armed([&amp;](test::fuse&amp;) -&gt; task&lt;&gt; {
test::stream mock(f); // test::stream
// ... run test ...
});</code></pre>
</div>
</div>
<div class="paragraph">
<p><code>fuse::armed</code> runs the test function repeatedly, injecting errors at each operation point:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>First run: error at operation 1</p>
</li>
<li>
<p>Second run: error at operation 2</p>
</li>
<li>
<p>&#8230;&#8203;and so on until all operations succeed</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>This systematically tests all error handling paths.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_output"><a class="anchor" href="#_output"></a>Output</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-asciidoc hljs" data-lang="asciidoc">Test: happy path
PASSED
Test: partial reads (1 byte at a time)
PASSED
Test: error injection
Runs: 9 (success=2, error=7)
PASSED (all error paths tested)
All tests passed!</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_exercises"><a class="anchor" href="#_exercises"></a>Exercises</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Add a test for EOF handling (what if input doesn&#8217;t end with newline?)</p>
</li>
<li>
<p>Test with different max_read_size values</p>
</li>
<li>
<p>Add a test for write errors using <code>test::write_stream</code></p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_next_steps"><a class="anchor" href="#_next_steps"></a>Next Steps</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><a href="7e.type-erased-echo.html" class="xref page">Type-Erased Echo</a> — Compilation firewall pattern</p>
</li>
</ul>
</div>
</div>
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