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Add a generator that takes an iterator pair

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Martin Hořeňovský 2019-10-06 13:49:50 +02:00
parent b8b765d55e
commit 319cb9e1da
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8 changed files with 196 additions and 8 deletions
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8
docs/generators.md
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@ -46,13 +46,16 @@ a test case,
* `MapGenerator<T, U, Func>` -- returns the result of applying `Func`
on elements from a different generator
* `ChunkGenerator<T>` -- returns chunks (inside `std::vector`) of n elements from a generator
* 3 specific purpose generators
* 4 specific purpose generators
* `RandomIntegerGenerator<Integral>` -- generates random Integrals from range
* `RandomFloatGenerator<Float>` -- generates random Floats from range
* `RangeGenerator<T>` -- generates all values inside a specific range
* `IteratorGenerator<T>` -- copies and returns values from an iterator range
> `ChunkGenerator<T>`, `RandomIntegerGenerator<Integral>`, `RandomFloatGenerator<Float>` and `RangeGenerator<T>` were introduced in Catch 2.7.0.
> `IteratorGenerator<T>` was introduced in Catch X.Y.Z.
The generators also have associated helper functions that infer their
type, making their usage much nicer. These are
@ -68,9 +71,12 @@ type, making their usage much nicer. These are
* `random(IntegerOrFloat a, IntegerOrFloat b)` for `RandomIntegerGenerator` or `RandomFloatGenerator`
* `range(start, end)` for `RangeGenerator<T>` with a step size of `1`
* `range(start, end, step)` for `RangeGenerator<T>` with a custom step size
* `from_range(InputIterator from, InputIterator to)` for `IteratorGenerator<T>`
> `chunk()`, `random()` and both `range()` functions were introduced in Catch 2.7.0.
> `from_range` has been introduced in Catch X.Y.Z
And can be used as shown in the example below to create a generator
that returns 100 odd random number:

33
include/internal/catch_generators_specific.hpp
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@ -128,6 +128,39 @@ GeneratorWrapper<T> range(T const& start, T const& end) {
}
template <typename T>
class IteratorGenerator final : public IGenerator<T> {
static_assert(!std::is_same<T, bool>::value,
"IteratorGenerator currently does not support bools"
"because of std::vector<bool> specialization");
std::vector<T> m_elems;
size_t m_current = 0;
public:
template <typename InputIterator, typename InputSentinel>
IteratorGenerator(InputIterator first, InputSentinel last):m_elems(first, last) {
if (m_elems.empty()) {
Catch::throw_exception(GeneratorException("IteratorGenerator received no valid values"));
}
}
T const& get() const override {
return m_elems[m_current];
}
bool next() override {
++m_current;
return m_current != m_elems.size();
}
};
template <typename InputIterator,
typename InputSentinel,
typename ResultType = typename std::iterator_traits<InputIterator>::value_type>
GeneratorWrapper<ResultType> from_range(InputIterator from, InputSentinel to) {
return GeneratorWrapper<ResultType>(pf::make_unique<IteratorGenerator<ResultType>>(from, to));
}
} // namespace Generators
} // namespace Catch

6
projects/SelfTest/Baselines/compact.sw.approved.txt
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@ -310,6 +310,12 @@ Condition.tests.cpp:<line number>: passed: 6 == uc for: 6 == 6
Condition.tests.cpp:<line number>: passed: (std::numeric_limits<uint32_t>::max)() > ul for: 4294967295 (0x<hex digits>) > 4
Matchers.tests.cpp:<line number>: failed: testStringForMatching(), Contains("not there", Catch::CaseSensitive::No) for: "this string contains 'abc' as a substring" contains: "not there" (case insensitive)
Matchers.tests.cpp:<line number>: failed: testStringForMatching(), Contains("STRING") for: "this string contains 'abc' as a substring" contains: "STRING"
Generators.tests.cpp:<line number>: passed: elem % 2 == 1 for: 1 == 1
Generators.tests.cpp:<line number>: passed: elem % 2 == 1 for: 1 == 1
Generators.tests.cpp:<line number>: passed: elem % 2 == 1 for: 1 == 1
Generators.tests.cpp:<line number>: passed: elem % 2 == 1 for: 1 == 1
Generators.tests.cpp:<line number>: passed: elem % 2 == 1 for: 1 == 1
Generators.tests.cpp:<line number>: passed: elem % 2 == 1 for: 1 == 1
Exception.tests.cpp:<line number>: failed: unexpected exception with message: 'custom exception - not std'; expression was: throwCustom()
Exception.tests.cpp:<line number>: failed: unexpected exception with message: 'custom exception - not std'; expression was: throwCustom(), std::exception
Exception.tests.cpp:<line number>: failed: unexpected exception with message: 'custom std exception'

4
projects/SelfTest/Baselines/console.std.approved.txt
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@ -1380,6 +1380,6 @@ due to unexpected exception with message:
Why would you throw a std::string?
===============================================================================
test cases: 300 | 226 passed | 70 failed | 4 failed as expected
assertions: 1564 | 1412 passed | 131 failed | 21 failed as expected
test cases: 301 | 227 passed | 70 failed | 4 failed as expected
assertions: 1570 | 1418 passed | 131 failed | 21 failed as expected

70
projects/SelfTest/Baselines/console.sw.approved.txt
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@ -2381,6 +2381,72 @@ Matchers.tests.cpp:<line number>: FAILED:
with expansion:
"this string contains 'abc' as a substring" contains: "STRING"
-------------------------------------------------------------------------------
Copy and then generate a range
-------------------------------------------------------------------------------
Generators.tests.cpp:<line number>
...............................................................................
Generators.tests.cpp:<line number>: PASSED:
REQUIRE( elem % 2 == 1 )
with expansion:
1 == 1
-------------------------------------------------------------------------------
Copy and then generate a range
-------------------------------------------------------------------------------
Generators.tests.cpp:<line number>
...............................................................................
Generators.tests.cpp:<line number>: PASSED:
REQUIRE( elem % 2 == 1 )
with expansion:
1 == 1
-------------------------------------------------------------------------------
Copy and then generate a range
-------------------------------------------------------------------------------
Generators.tests.cpp:<line number>
...............................................................................
Generators.tests.cpp:<line number>: PASSED:
REQUIRE( elem % 2 == 1 )
with expansion:
1 == 1
-------------------------------------------------------------------------------
Copy and then generate a range
-------------------------------------------------------------------------------
Generators.tests.cpp:<line number>
...............................................................................
Generators.tests.cpp:<line number>: PASSED:
REQUIRE( elem % 2 == 1 )
with expansion:
1 == 1
-------------------------------------------------------------------------------
Copy and then generate a range
-------------------------------------------------------------------------------
Generators.tests.cpp:<line number>
...............................................................................
Generators.tests.cpp:<line number>: PASSED:
REQUIRE( elem % 2 == 1 )
with expansion:
1 == 1
-------------------------------------------------------------------------------
Copy and then generate a range
-------------------------------------------------------------------------------
Generators.tests.cpp:<line number>
...............................................................................
Generators.tests.cpp:<line number>: PASSED:
REQUIRE( elem % 2 == 1 )
with expansion:
1 == 1
-------------------------------------------------------------------------------
Custom exceptions can be translated when testing for nothrow
-------------------------------------------------------------------------------
@ -12499,6 +12565,6 @@ Misc.tests.cpp:<line number>
Misc.tests.cpp:<line number>: PASSED:
===============================================================================
test cases: 300 | 210 passed | 86 failed | 4 failed as expected
assertions: 1581 | 1412 passed | 148 failed | 21 failed as expected
test cases: 301 | 211 passed | 86 failed | 4 failed as expected
assertions: 1587 | 1418 passed | 148 failed | 21 failed as expected

3
projects/SelfTest/Baselines/junit.sw.approved.txt
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@ -1,7 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?>
<testsuitesloose text artifact
>
<testsuite name="<exe-name>" errors="17" failures="132" tests="1582" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
<testsuite name="<exe-name>" errors="17" failures="132" tests="1588" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
<properties>
<property name="filters" value="~[!nonportable]~[!benchmark]~[approvals]"/>
<property name="random-seed" value="1"/>
@ -254,6 +254,7 @@ Matchers.tests.cpp:<line number>
Matchers.tests.cpp:<line number>
</failure>
</testcase>
<testcase classname="<exe-name>.global" name="Copy and then generate a range" time="{duration}"/>
<testcase classname="<exe-name>.global" name="Custom exceptions can be translated when testing for nothrow" time="{duration}">
<error message="throwCustom()" type="REQUIRE_NOTHROW">
custom exception - not std

55
projects/SelfTest/Baselines/xml.sw.approved.txt
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@ -2816,6 +2816,57 @@ Nor would this
</Expression>
<OverallResult success="false"/>
</TestCase>
<TestCase name="Copy and then generate a range" tags="[generators]" filename="projects/<exe-name>/UsageTests/Generators.tests.cpp" >
<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/Generators.tests.cpp" >
<Original>
elem % 2 == 1
</Original>
<Expanded>
1 == 1
</Expanded>
</Expression>
<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/Generators.tests.cpp" >
<Original>
elem % 2 == 1
</Original>
<Expanded>
1 == 1
</Expanded>
</Expression>
<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/Generators.tests.cpp" >
<Original>
elem % 2 == 1
</Original>
<Expanded>
1 == 1
</Expanded>
</Expression>
<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/Generators.tests.cpp" >
<Original>
elem % 2 == 1
</Original>
<Expanded>
1 == 1
</Expanded>
</Expression>
<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/Generators.tests.cpp" >
<Original>
elem % 2 == 1
</Original>
<Expanded>
1 == 1
</Expanded>
</Expression>
<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/Generators.tests.cpp" >
<Original>
elem % 2 == 1
</Original>
<Expanded>
1 == 1
</Expanded>
</Expression>
<OverallResult success="true"/>
</TestCase>
<TestCase name="Custom exceptions can be translated when testing for nothrow" tags="[!throws][.][failing]" filename="projects/<exe-name>/UsageTests/Exception.tests.cpp" >
<Expression success="false" type="REQUIRE_NOTHROW" filename="projects/<exe-name>/UsageTests/Exception.tests.cpp" >
<Original>
@ -14872,7 +14923,7 @@ loose text artifact
</Section>
<OverallResult success="true"/>
</TestCase>
<OverallResults successes="1412" failures="149" expectedFailures="21"/>
<OverallResults successes="1418" failures="149" expectedFailures="21"/>
</Group>
<OverallResults successes="1412" failures="148" expectedFailures="21"/>
<OverallResults successes="1418" failures="148" expectedFailures="21"/>
</Catch>

25
projects/SelfTest/UsageTests/Generators.tests.cpp
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@ -212,3 +212,28 @@ TEST_CASE("Nested generators and captured variables", "[generators]") {
auto values = GENERATE_COPY(range(from, to));
REQUIRE(values > -6);
}
namespace {
std::vector<int> make_data() {
return { 1, 3, 5, 7, 9, 11 };
}
}
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wexit-time-destructors"
#endif
TEST_CASE("Copy and then generate a range", "[generators]") {
static auto data = make_data();
// It is important to notice that a generator is only initialized
// **once** per run. What this means is that modifying data will not
// modify the underlying generator.
auto elem = GENERATE_REF(from_range(data.begin(), data.end()));
REQUIRE(elem % 2 == 1);
}
#if defined(__clang__)
#pragma clang diagnostic pop
#endif