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Merge pull request #1614 from mlimber/master

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Allow custom precision in error reports for floating-point numbers
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Martin Hořeňovský 2019-05-03 17:46:03 +02:00 committed by GitHub
commit 92ad9ee355
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9 changed files with 150 additions and 9 deletions
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18
docs/tostring.md
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@ -7,6 +7,8 @@
[Catch::is_range specialisation](#catchis_range-specialisation)<br>
[Exceptions](#exceptions)<br>
[Enums](#enums)<br>
[Floating point precision](#floating-point-precision)<br>
Catch needs to be able to convert types you use in assertions and logging expressions into strings (for logging and reporting purposes).
Most built-in or std types are supported out of the box but there are two ways that you can tell Catch how to convert your own types (or other, third-party types) into strings.
@ -104,6 +106,22 @@ TEST_CASE() {
}
```
## Floating point precision
Catch provides a built-in `StringMaker` specialization for both `float`
`double`. By default, it uses what we think is a reasonable precision,
but you can customize it by modifying the `precision` static variable
inside the `StringMaker` specialization, like so:
```cpp
Catch::StringMaker<float>::precision = 15;
const float testFloat1 = 1.12345678901234567899f;
const float testFloat2 = 1.12345678991234567899f;
REQUIRE(testFloat1 == testFloat2);
```
This assertion will fail and print out the `testFloat1` and `testFloat2`
to 15 decimal places.
---

9
include/internal/catch_tostring.cpp
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@ -234,11 +234,16 @@ std::string StringMaker<std::nullptr_t>::convert(std::nullptr_t) {
return "nullptr";
}
int StringMaker<float>::precision = 5;
std::string StringMaker<float>::convert(float value) {
return fpToString(value, 5) + 'f';
return fpToString(value, precision) + 'f';
}
int StringMaker<double>::precision = 10;
std::string StringMaker<double>::convert(double value) {
return fpToString(value, 10);
return fpToString(value, precision);
}
std::string ratio_string<std::atto>::symbol() { return "a"; }

3
include/internal/catch_tostring.h
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@ -261,10 +261,13 @@ namespace Catch {
template<>
struct StringMaker<float> {
static std::string convert(float value);
static int precision;
};
template<>
struct StringMaker<double> {
static std::string convert(double value);
static int precision;
};
template <typename T>

4
projects/SelfTest/Baselines/compact.sw.approved.txt
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@ -859,6 +859,10 @@ Condition.tests.cpp:<line number>: passed: cpc != 0 for: 0x<hex digits> != 0
Condition.tests.cpp:<line number>: passed: returnsNull() == 0 for: {null string} == 0
Condition.tests.cpp:<line number>: passed: returnsConstNull() == 0 for: {null string} == 0
Condition.tests.cpp:<line number>: passed: 0 != p for: 0 != 0x<hex digits>
ToStringGeneral.tests.cpp:<line number>: passed: str1.size() == 3 + 5 for: 8 == 8
ToStringGeneral.tests.cpp:<line number>: passed: str2.size() == 3 + 10 for: 13 == 13
ToStringGeneral.tests.cpp:<line number>: passed: str1.size() == 2 + 5 for: 7 == 7
ToStringGeneral.tests.cpp:<line number>: passed: str2.size() == 2 + 15 for: 17 == 17
Matchers.tests.cpp:<line number>: passed: "foo", Predicate<const char*>([] (const char* const&) { return true; }) for: "foo" matches undescribed predicate
CmdLine.tests.cpp:<line number>: passed: result for: {?}
CmdLine.tests.cpp:<line number>: passed: config.processName == "" for: "" == ""

4
projects/SelfTest/Baselines/console.std.approved.txt
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@ -1299,6 +1299,6 @@ due to unexpected exception with message:
Why would you throw a std::string?
===============================================================================
test cases: 266 | 199 passed | 63 failed | 4 failed as expected
assertions: 1449 | 1304 passed | 124 failed | 21 failed as expected
test cases: 267 | 200 passed | 63 failed | 4 failed as expected
assertions: 1453 | 1308 passed | 124 failed | 21 failed as expected

38
projects/SelfTest/Baselines/console.sw.approved.txt
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@ -6192,6 +6192,40 @@ Condition.tests.cpp:<line number>: PASSED:
with expansion:
0 != 0x<hex digits>
-------------------------------------------------------------------------------
Precision of floating point stringification can be set
Floats
-------------------------------------------------------------------------------
ToStringGeneral.tests.cpp:<line number>
...............................................................................
ToStringGeneral.tests.cpp:<line number>: PASSED:
CHECK( str1.size() == 3 + 5 )
with expansion:
8 == 8
ToStringGeneral.tests.cpp:<line number>: PASSED:
REQUIRE( str2.size() == 3 + 10 )
with expansion:
13 == 13
-------------------------------------------------------------------------------
Precision of floating point stringification can be set
Double
-------------------------------------------------------------------------------
ToStringGeneral.tests.cpp:<line number>
...............................................................................
ToStringGeneral.tests.cpp:<line number>: PASSED:
CHECK( str1.size() == 2 + 5 )
with expansion:
7 == 7
ToStringGeneral.tests.cpp:<line number>: PASSED:
REQUIRE( str2.size() == 2 + 15 )
with expansion:
17 == 17
-------------------------------------------------------------------------------
Predicate matcher can accept const char*
-------------------------------------------------------------------------------
@ -11389,6 +11423,6 @@ Misc.tests.cpp:<line number>
Misc.tests.cpp:<line number>: PASSED:
===============================================================================
test cases: 266 | 183 passed | 79 failed | 4 failed as expected
assertions: 1466 | 1304 passed | 141 failed | 21 failed as expected
test cases: 267 | 184 passed | 79 failed | 4 failed as expected
assertions: 1470 | 1308 passed | 141 failed | 21 failed as expected

4
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="125" tests="1467" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
<testsuite name="<exe-name>" errors="17" failures="125" tests="1471" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
<properties>
<property name="filters" value="~[!nonportable]~[!benchmark]~[approvals]"/>
<property name="random-seed" value="1"/>
@ -574,6 +574,8 @@ Message.tests.cpp:<line number>
<testcase classname="<exe-name>.global" name="Parse test names and tags/empty quoted name" time="{duration}"/>
<testcase classname="<exe-name>.global" name="Parse test names and tags/quoted string followed by tag exclusion" time="{duration}"/>
<testcase classname="<exe-name>.global" name="Pointers can be compared to null" time="{duration}"/>
<testcase classname="<exe-name>.global" name="Precision of floating point stringification can be set/Floats" time="{duration}"/>
<testcase classname="<exe-name>.global" name="Precision of floating point stringification can be set/Double" time="{duration}"/>
<testcase classname="<exe-name>.global" name="Predicate matcher can accept const char*" time="{duration}"/>
<testcase classname="<exe-name>.global" name="Process can be configured on command line/empty args don't cause a crash" time="{duration}"/>
<testcase classname="<exe-name>.global" name="Process can be configured on command line/default - no arguments" time="{duration}"/>

45
projects/SelfTest/Baselines/xml.sw.approved.txt
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@ -7778,6 +7778,47 @@ Nor would this
</Expression>
<OverallResult success="true"/>
</TestCase>
<TestCase name="Precision of floating point stringification can be set" tags="[floatingPoint][toString]" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
<Section name="Floats" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
<Expression success="true" type="CHECK" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
<Original>
str1.size() == 3 + 5
</Original>
<Expanded>
8 == 8
</Expanded>
</Expression>
<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
<Original>
str2.size() == 3 + 10
</Original>
<Expanded>
13 == 13
</Expanded>
</Expression>
<OverallResults successes="2" failures="0" expectedFailures="0"/>
</Section>
<Section name="Double" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
<Expression success="true" type="CHECK" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
<Original>
str1.size() == 2 + 5
</Original>
<Expanded>
7 == 7
</Expanded>
</Expression>
<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
<Original>
str2.size() == 2 + 15
</Original>
<Expanded>
17 == 17
</Expanded>
</Expression>
<OverallResults successes="2" failures="0" expectedFailures="0"/>
</Section>
<OverallResult success="true"/>
</TestCase>
<TestCase name="Predicate matcher can accept const char*" tags="[compilation][matchers]" filename="projects/<exe-name>/UsageTests/Matchers.tests.cpp" >
<Expression success="true" type="REQUIRE_THAT" filename="projects/<exe-name>/UsageTests/Matchers.tests.cpp" >
<Original>
@ -13728,7 +13769,7 @@ loose text artifact
</Section>
<OverallResult success="true"/>
</TestCase>
<OverallResults successes="1304" failures="142" expectedFailures="21"/>
<OverallResults successes="1308" failures="142" expectedFailures="21"/>
</Group>
<OverallResults successes="1304" failures="141" expectedFailures="21"/>
<OverallResults successes="1308" failures="141" expectedFailures="21"/>
</Catch>

34
projects/SelfTest/UsageTests/ToStringGeneral.tests.cpp
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@ -128,6 +128,40 @@ TEST_CASE("String views are stringified like other strings", "[toString][approva
#endif
TEST_CASE("Precision of floating point stringification can be set", "[toString][floatingPoint]") {
SECTION("Floats") {
using sm = Catch::StringMaker<float>;
const auto oldPrecision = sm::precision;
const float testFloat = 1.12345678901234567899f;
auto str1 = sm::convert(testFloat);
sm::precision = 5;
// "1." prefix = 2 chars, f suffix is another char
CHECK(str1.size() == 3 + 5);
sm::precision = 10;
auto str2 = sm::convert(testFloat);
REQUIRE(str2.size() == 3 + 10);
sm::precision = oldPrecision;
}
SECTION("Double") {
using sm = Catch::StringMaker<double>;
const auto oldPrecision = sm::precision;
const double testDouble = 1.123456789012345678901234567899;
sm::precision = 5;
auto str1 = sm::convert(testDouble);
// "1." prefix = 2 chars
CHECK(str1.size() == 2 + 5);
sm::precision = 15;
auto str2 = sm::convert(testDouble);
REQUIRE(str2.size() == 2 + 15);
sm::precision = oldPrecision;
}
}
namespace {
struct WhatException : std::exception {