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<!DOCTYPE html>
<!-- Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. -->
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Vespa Test Framework Tutorial</title>
# Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
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<body>
<header>
<h1>Vespa Test Framework Tutorial</h1>
</header>
<section>
<div class="page-header">
<h1>Introduction</h1>
</div>
<p>
The Vespa test framework helps you write small applications to test
C++ code. All interaction with the test framework is done with the use
of macros.
</p>
<p>
The minimal test application looks like this:
</p>
<div class="example" id="minimal">
<h2>minimal_test.cpp</h2>
<pre class="prettyprint linenums">
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
TEST_MAIN() {}
</pre>
<pre class="output">
minimal_test.cpp: info: running test suite 'minimal_test.cpp'
minimal_test.cpp: info: summary --- 0 check(s) passed --- 0 check(s) failed
minimal_test.cpp: info: CONCLUSION: PASS
</pre>
</div>
<p>
The runnable application itself is called a <strong>test
suite</strong> and inherits its name from the cpp file containing the
TEST_MAIN macro. Each individual verification of some value is called
a <strong>check</strong>. Checks can be put anywhere, but it is highly
recommended that you put them inside <strong>tests</strong>. Tests are
created by a family of macros. Another macro (TEST_RUN_ALL) is used to
execute them.
</p>
<p>
Example with two tests, each containing a single check:
</p>
<div class="example" id="simple">
<h2>simple_test.cpp</h2>
<pre class="prettyprint linenums">
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
TEST("require something") {
EXPECT_TRUE(true);
}
TEST("require something else") {
EXPECT_TRUE(true);
}
TEST_MAIN() { TEST_RUN_ALL(); }
</pre>
<pre class="output">
simple_test.cpp: info: running test suite 'simple_test.cpp'
simple_test.cpp: info: status_for_test 'require something': PASS
simple_test.cpp: info: status_for_test 'require something else': PASS
simple_test.cpp: info: test summary --- 2 test(s) passed --- 0 test(s) failed
simple_test.cpp: info: imported 2 passed check(s) from 1 thread(s)
simple_test.cpp: info: summary --- 2 check(s) passed --- 0 check(s) failed
simple_test.cpp: info: CONCLUSION: PASS
</pre>
</div>
</section>
<section>
<div class="page-header">
<h1>Checks</h1>
</div>
<p>
All checks are available in two variants. Those with the
<strong>EXPECT_</strong> prefix allow execution to continue even if a
check fails. Those with the <strong>ASSERT_</strong> prefix will
terminate execution of the current test if it fails.
</p>
<div class="example" id="checks">
<h2>checks_test.cpp</h2>
<pre class="prettyprint linenums">
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
#include <stdexcept>
void willThrow() {
throw std::runtime_error("This failed");
}
TEST("require that checks work") {
EXPECT_TRUE(true);
EXPECT_FALSE(false);
EXPECT_EQUAL(3, 3);
EXPECT_NOT_EQUAL(3, 4);
EXPECT_APPROX(3.0, 3.1, 0.2);
EXPECT_NOT_APPROX(3.0, 3.5, 0.2);
EXPECT_LESS(3, 4);
EXPECT_LESS_EQUAL(3, 3);
EXPECT_GREATER(4, 3);
EXPECT_GREATER_EQUAL(4, 4);
EXPECT_EXCEPTION(willThrow(), std::runtime_error, "fail");
}
TEST("this test will fail") {
EXPECT_EQUAL(3, 4);
}
TEST_MAIN() { TEST_RUN_ALL(); }
</pre>
<pre class="output">
checks_test.cpp: info: running test suite 'checks_test.cpp'
checks_test.cpp: info: status_for_test 'require that checks work': PASS
checks_test.cpp: ERROR: check failure #1: '3 == 4' in thread '0(1)' (checks_test.cpp:24)
STATE[0]: 'this test will fail' (checks_test.cpp:23)
lhs: 3
rhs: 4
checks_test.cpp: ERROR: status_for_test 'this test will fail': FAIL
checks_test.cpp: info: test summary --- 1 test(s) passed --- 1 test(s) failed
checks_test.cpp: info: imported 11 passed check(s) from 1 thread(s)
checks_test.cpp: info: summary --- 11 check(s) passed --- 1 check(s) failed
checks_test.cpp: info: CONCLUSION: FAIL
</pre>
</div>
<p>
Checks involving comparison of values typically use == and <
operators to compare values. Also; in order to be part of a comparison
check, the value must support the << operator to print the value
to a string stream in case the check fails.
</p>
</section>
<section>
<div class="page-header">
<h1>Test Fixtures</h1>
</div>
<p>
Sometimes multiple tests wish to use the same predefined state as a
starting point. This state is called a test fixture. Test fixtures are
untangled from the actual tests and construction/destruction is used
to handle their lifetime. When thinking of what can be used as a
fixture, think of what can be put after <strong>new</strong> to create
an object.
</p>
<ul>
<li>A single test can have multiple test fixtures.</li>
<li>The number of <strong>F</strong>s in the test macro denotes the number of fixtures.</li>
<li>Inside the test, fixtures are available as <strong>f1</strong>, <strong>f2</strong> and so forth.</li>
<li>Test fixtures can be parameterized with constructor parameters.</li>
<li>Checks can be performed inside test fixture constructors.</li>
<li>A test fixture constructor can take other test fixtures as input.</li>
</ul>
<div class="example" id="fixtures">
<h2>fixtures_test.cpp</h2>
<pre class="prettyprint linenums">
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
struct Fixture {
int value;
Fixture() : value(5) {}
};
TEST_F("basic fixture", Fixture) {
EXPECT_EQUAL(5, f1.value);
}
TEST_FFF("fancy fixtures", size_t(10), int(5), std::vector<int>(f1, f2)) {
EXPECT_EQUAL(10u, f1);
EXPECT_EQUAL(5, f2);
ASSERT_EQUAL(10u, f3.size());
EXPECT_EQUAL(5, f3[7]);
}
TEST_MAIN() { TEST_RUN_ALL(); }
</pre>
<pre class="output">
fixtures_test.cpp: info: running test suite 'fixtures_test.cpp'
fixtures_test.cpp: info: status_for_test 'basic fixture': PASS
fixtures_test.cpp: info: status_for_test 'fancy fixtures': PASS
fixtures_test.cpp: info: test summary --- 2 test(s) passed --- 0 test(s) failed
fixtures_test.cpp: info: imported 5 passed check(s) from 1 thread(s)
fixtures_test.cpp: info: summary --- 5 check(s) passed --- 0 check(s) failed
fixtures_test.cpp: info: CONCLUSION: PASS
</pre>
</div>
</section>
<section>
<div class="page-header">
<h1>Multi-Threaded Tests</h1>
</div>
<p>
One of the most novel features of the test framework is the ability to
write multi-threaded tests. Multi-threaded tests are created by using
test macros containing <strong>_MT</strong> and supplying a thread
count. All threads will execute the block of code encapsulated by the
test. The test fixtures are shared among all threads. In addition,
each thread has a variable named <strong>num_threads</strong>
containing the total number of threads running the test and a variable
named <strong>thread_id</strong> identifying the thread.
</p>
<p>
The <strong>TEST_BARRIER()</strong> macro can be used inside the test
to synchronize the threads. The macro will block execution of each
thread invoking it until all threads have invoked it.
</p>
<div class="example" id="threads">
<h2>threads_test.cpp</h2>
<pre class="prettyprint linenums">
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
TEST_MT_F("multiple threads", 2, std::vector<size_t>(num_threads)) {
ASSERT_EQUAL(num_threads, f1.size());
f1[thread_id] = thread_id;
TEST_BARRIER();
if (thread_id == 0) {
TEST_TRACE();
EXPECT_EQUAL(1u, f1[1]);
} else {
TEST_TRACE();
EXPECT_EQUAL(0u, f1[0]);
}
}
TEST_MAIN() { TEST_RUN_ALL(); }
</pre>
<pre class="output">
threads_test.cpp: info: running test suite 'threads_test.cpp'
threads_test.cpp: info: trace: thread '0(2)' (threads_test.cpp:9)
threads_test.cpp: info: trace: thread '1(2)' (threads_test.cpp:12)
threads_test.cpp: info: status_for_test 'multiple threads': PASS
threads_test.cpp: info: test summary --- 1 test(s) passed --- 0 test(s) failed
threads_test.cpp: info: imported 4 passed check(s) from 2 thread(s)
threads_test.cpp: info: summary --- 4 check(s) passed --- 0 check(s) failed
threads_test.cpp: info: CONCLUSION: PASS
</pre>
</div>
</section>
<section>
<div class="page-header">
<h1>Real World Examples</h1>
</div>
<div class="example" id="../box">
<h2>box_test.cpp</h2>
<pre class="prettyprint linenums">
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
#include <vespa/vespalib/util/box.h>
using namespace vespalib;
void checkValues(const std::vector<int> &values, size_t n) {
ASSERT_EQUAL(n, values.size());
for (size_t i = 0; i < n; ++i) {
EXPECT_EQUAL(int(10 + (10 * i)), values[i]);
}
}
TEST("require that boxes can be created and converted to vector") {
Box<int> box;
box.add(10).add(20).add(30);
checkValues(box, 3);
}
TEST("require that boxes can be created in place") {
checkValues(Box<int>().add(10).add(20).add(30), 3);
}
TEST("require that make_box works") {
checkValues(make_box(10), 1);
checkValues(make_box(10, 20), 2);
checkValues(make_box(10, 20, 30), 3);
checkValues(make_box(10, 20, 30, 40), 4);
checkValues(make_box(10, 20, 30, 40, 50), 5);
}
TEST_MAIN() { TEST_RUN_ALL(); }
</pre>
<pre class="output">
box_test.cpp: info: running test suite 'box_test.cpp'
box_test.cpp: info: status_for_test 'require that boxes can be created and converted to vector': PASS
box_test.cpp: info: status_for_test 'require that boxes can be created in place': PASS
box_test.cpp: info: status_for_test 'require that make_box works': PASS
box_test.cpp: info: test summary --- 3 test(s) passed --- 0 test(s) failed
box_test.cpp: info: imported 28 passed check(s) from 1 thread(s)
box_test.cpp: info: summary --- 28 check(s) passed --- 0 check(s) failed
box_test.cpp: info: CONCLUSION: PASS
</pre>
</div>
<div class="example" id="../barrier">
<h2>barrier_test.cpp</h2>
<pre class="prettyprint linenums">
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
#include <vespa/vespalib/util/barrier.h>
using namespace vespalib;
struct Fixture {
Barrier barrier;
CountDownLatch latch;
Fixture(size_t n) : barrier(n), latch(n) {}
};
TEST_MT_F("require that barriers are satisfied by the appropriate number of threads", 3, Fixture(num_threads)) {
if (thread_id == 0) {
f1.latch.countDown();
EXPECT_FALSE(f.latch.await(250));
EXPECT_TRUE(f.barrier.await());
EXPECT_TRUE(f.latch.await(25000));
} else {
EXPECT_TRUE(f1.barrier.await());
f1.latch.countDown();
}
}
TEST_MT_F("require that barriers can be used multiple times", 3, Fixture(num_threads)) {
EXPECT_TRUE(f1.barrier.await());
EXPECT_TRUE(f1.barrier.await());
if (thread_id == 0) {
f1.latch.countDown();
EXPECT_FALSE(f.latch.await(250));
EXPECT_TRUE(f.barrier.await());
EXPECT_TRUE(f.latch.await(25000));
} else {
EXPECT_TRUE(f1.barrier.await());
f1.latch.countDown();
}
}
TEST_MT_F("require that barriers can be broken", 3, Fixture(num_threads)) {
EXPECT_TRUE(f1.barrier.await());
if (thread_id == 0) {
f1.latch.countDown();
EXPECT_FALSE(f.latch.await(250));
f1.barrier.destroy();
EXPECT_TRUE(f.latch.await(25000));
} else {
EXPECT_FALSE(f1.barrier.await());
f1.latch.countDown();
}
EXPECT_FALSE(f1.barrier.await());
}
TEST_MT_F("require that barriers cannot be retroactively broken", 100, Barrier(num_threads)) {
EXPECT_TRUE(f1.await());
f1.destroy();
EXPECT_FALSE(f1.await());
}
TEST_MAIN() { TEST_RUN_ALL(); }
</pre>
<pre class="output">
barrier_test.cpp: info: running test suite 'barrier_test.cpp'
barrier_test.cpp: info: status_for_test 'require that barriers are satisfied by the appropriate number of threads': PASS
barrier_test.cpp: info: status_for_test 'require that barriers can be used multiple times': PASS
barrier_test.cpp: info: status_for_test 'require that barriers can be broken': PASS
barrier_test.cpp: info: status_for_test 'require that barriers cannot be retroactively broken': PASS
barrier_test.cpp: info: test summary --- 4 test(s) passed --- 0 test(s) failed
barrier_test.cpp: info: imported 226 passed check(s) from 100 thread(s)
barrier_test.cpp: info: summary --- 226 check(s) passed --- 0 check(s) failed
barrier_test.cpp: info: CONCLUSION: PASS
</pre>
</div>
<div class="example" id="../dual_merge_director">
<h2>dual_merge_director_test.cpp</h2>
<pre class="prettyprint linenums">
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
#include <vespa/vespalib/util/dual_merge_director.h>
using namespace vespalib;
struct MySource : public DualMergeDirector::Source {
bool typeA;
std::string data;
std::string diff;
MySource(bool a, size_t num_sources, size_t source_id)
: typeA(a),
data(num_sources, '0'),
diff(num_sources, '5')
{
if (source_id < num_sources) {
data[source_id] = '1';
diff[source_id] = '6';
}
}
virtual void merge(Source &mt) {
MySource &rhs = static_cast<MySource&>(mt);
ASSERT_EQUAL(typeA, rhs.typeA);
ASSERT_EQUAL(data.size(), rhs.data.size());
for (size_t i = 0; i < data.size(); ++i) {
int d = (rhs.data[i] - '0');
data[i] += d;
diff[i] += d;
rhs.diff[i] -= d;
}
}
void verifyFinal() const {
EXPECT_EQUAL(std::string(data.size(), '1'), data);
EXPECT_EQUAL(std::string(diff.size(), '6'), diff);
}
void verifyIntermediate() const {
EXPECT_EQUAL(std::string(diff.size(), '5'), diff);
}
};
TEST_MT_F("require that merging works", 64, std::unique_ptr<DualMergeDirector>()) {
for (size_t use_threads = 1; use_threads <= num_threads; ++use_threads) {
MySource sourceA(true, use_threads, thread_id);
MySource sourceB(false, use_threads, thread_id);
if (thread_id == 0) {
f1.reset(new DualMergeDirector(use_threads));
}
TEST_BARRIER();
if (thread_id < use_threads) {
f1->dualMerge(thread_id, sourceA, sourceB);
}
TEST_BARRIER();
if (thread_id == 0) {
sourceA.verifyFinal();
sourceB.verifyFinal();
} else if (thread_id < use_threads) {
sourceA.verifyIntermediate();
sourceB.verifyIntermediate();
}
}
}
TEST_MAIN() { TEST_RUN_ALL(); }
</pre>
<pre class="output">
dual_merge_director_test.cpp: info: running test suite 'dual_merge_director_test.cpp'
dual_merge_director_test.cpp: info: status_for_test 'require that merging works': PASS
dual_merge_director_test.cpp: info: test summary --- 1 test(s) passed --- 0 test(s) failed
dual_merge_director_test.cpp: info: imported 12352 passed check(s) from 64 thread(s)
dual_merge_director_test.cpp: info: summary --- 12352 check(s) passed --- 0 check(s) failed
dual_merge_director_test.cpp: info: CONCLUSION: PASS
</pre>
</div>
</section>
<section>
<div class="page-header">
<h1>Macro Summary</h1>
</div>
<h2>Overall Execution Macros</h2>
<ul>
<li><code>TEST_MAIN()</code></li>
<li><code>TEST_RUN_ALL()</code></li>
</ul>
<h2>Test Creation Macros</h2>
<ul>
<li><code>TEST(name)</code></li>
<li><code>TEST_F(name, fixture)</code></li>
<li><code>TEST_FF(name, fixture1, fixture2)</code></li>
<li><code>TEST_FFF(name, fixture1, fixture2, fixture3)</code></li>
</ul>
<ul>
<li><code>TEST_MT(name, threads)</code></li>
<li><code>TEST_MT_F(name, threads, fixture)</code></li>
<li><code>TEST_MT_FF(name, threads, fixture1, fixture2)</code></li>
<li><code>TEST_MT_FFF(name, threads, fixture1, fixture2, fixture3)</code></li>
</ul>
<ul>
<li><code>IGNORE_TEST(name)</code></li>
<li><code>IGNORE_TEST_F(name, fixture)</code></li>
<li><code>IGNORE_TEST_FF(name, fixture1, fixture2)</code></li>
<li><code>IGNORE_TEST_FFF(name, fixture1, fixture2, fixture3)</code></li>
</ul>
<ul>
<li><code>IGNORE_TEST_MT(name, threads)</code></li>
<li><code>IGNORE_TEST_MT_F(name, threads, fixture)</code></li>
<li><code>IGNORE_TEST_MT_FF(name, threads, fixture1, fixture2)</code></li>
<li><code>IGNORE_TEST_MT_FFF(name, threads, fixture1, fixture2, fixture3)</code></li>
</ul>
<h2>Check Macros</h2>
<ul>
<li><code>ASSERT_TRUE(rc)</code></li>
<li><code>ASSERT_FALSE(rc)</code></li>
<li><code>ASSERT_EQUAL(a, b)</code></li>
<li><code>ASSERT_NOT_EQUAL(a, b)</code></li>
<li><code>ASSERT_APPROX(a, b, eps)</code></li>
<li><code>ASSERT_NOT_APPROX(a, b, eps)</code></li>
<li><code>ASSERT_LESS(a, b)</code></li>
<li><code>ASSERT_LESS_EQUAL(a, b)</code></li>
<li><code>ASSERT_GREATER(a, b)</code></li>
<li><code>ASSERT_GREATER_EQUAL(a, b)</code></li>
<li><code>ASSERT_EXCEPTION(statement, exception_type, msg_substr)</code></li>
<li><code>TEST_FATAL(msg)</code></li>
</ul>
<ul>
<li><code>EXPECT_TRUE(rc)</code></li>
<li><code>EXPECT_FALSE(rc)</code></li>
<li><code>EXPECT_EQUAL(a, b)</code></li>
<li><code>EXPECT_NOT_EQUAL(a, b)</code></li>
<li><code>EXPECT_APPROX(a, b, eps)</code></li>
<li><code>EXPECT_NOT_APPROX(a, b, eps)</code></li>
<li><code>EXPECT_LESS(a, b)</code></li>
<li><code>EXPECT_LESS_EQUAL(a, b)</code></li>
<li><code>EXPECT_GREATER(a, b)</code></li>
<li><code>EXPECT_GREATER_EQUAL(a, b)</code></li>
<li><code>EXPECT_EXCEPTION(statement, exception_type, msg_substr)</code></li>
<li><code>TEST_ERROR(msg)</code></li>
</ul>
<h2>Thread Macros</h2>
<ul>
<li><code>TEST_BARRIER()</code></li>
</ul>
<h2>State Tracking Macros</h2>
<ul>
<li><code>TEST_DO(doit)</code></li>
<li><code>TEST_STATE(msg)</code></li>
</ul>
<h2>Macros of Limited Use</h2>
<ul>
<li><code>TEST_TRACE()</code></li>
<li><code>TEST_FLUSH()</code></li>
<li><code>TEST_THREAD(name)</code></li>
<li><code>TEST_DEBUG(lhsFile, rhsFile)</code></li>
<li><code>TEST_MAIN_WITH_PROCESS_PROXY()</code></li>
</ul>
</section>
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