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Merge pull request #1614 from mlimber/master
Allow custom precision in error reports for floating-point numbers
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commit
92ad9ee355
@ -7,6 +7,8 @@
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[Catch::is_range specialisation](#catchis_range-specialisation)<br>
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[Exceptions](#exceptions)<br>
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[Enums](#enums)<br>
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[Floating point precision](#floating-point-precision)<br>
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Catch needs to be able to convert types you use in assertions and logging expressions into strings (for logging and reporting purposes).
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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.
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@ -104,6 +106,22 @@ TEST_CASE() {
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}
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```
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## Floating point precision
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Catch provides a built-in `StringMaker` specialization for both `float`
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`double`. By default, it uses what we think is a reasonable precision,
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but you can customize it by modifying the `precision` static variable
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inside the `StringMaker` specialization, like so:
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```cpp
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Catch::StringMaker<float>::precision = 15;
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const float testFloat1 = 1.12345678901234567899f;
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const float testFloat2 = 1.12345678991234567899f;
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REQUIRE(testFloat1 == testFloat2);
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```
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This assertion will fail and print out the `testFloat1` and `testFloat2`
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to 15 decimal places.
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---
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@ -234,11 +234,16 @@ std::string StringMaker<std::nullptr_t>::convert(std::nullptr_t) {
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return "nullptr";
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}
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int StringMaker<float>::precision = 5;
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std::string StringMaker<float>::convert(float value) {
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return fpToString(value, 5) + 'f';
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return fpToString(value, precision) + 'f';
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}
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int StringMaker<double>::precision = 10;
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std::string StringMaker<double>::convert(double value) {
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return fpToString(value, 10);
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return fpToString(value, precision);
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}
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std::string ratio_string<std::atto>::symbol() { return "a"; }
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@ -261,10 +261,13 @@ namespace Catch {
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template<>
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struct StringMaker<float> {
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static std::string convert(float value);
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static int precision;
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};
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template<>
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struct StringMaker<double> {
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static std::string convert(double value);
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static int precision;
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};
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template <typename T>
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@ -859,6 +859,10 @@ Condition.tests.cpp:<line number>: passed: cpc != 0 for: 0x<hex digits> != 0
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Condition.tests.cpp:<line number>: passed: returnsNull() == 0 for: {null string} == 0
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Condition.tests.cpp:<line number>: passed: returnsConstNull() == 0 for: {null string} == 0
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Condition.tests.cpp:<line number>: passed: 0 != p for: 0 != 0x<hex digits>
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ToStringGeneral.tests.cpp:<line number>: passed: str1.size() == 3 + 5 for: 8 == 8
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ToStringGeneral.tests.cpp:<line number>: passed: str2.size() == 3 + 10 for: 13 == 13
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ToStringGeneral.tests.cpp:<line number>: passed: str1.size() == 2 + 5 for: 7 == 7
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ToStringGeneral.tests.cpp:<line number>: passed: str2.size() == 2 + 15 for: 17 == 17
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Matchers.tests.cpp:<line number>: passed: "foo", Predicate<const char*>([] (const char* const&) { return true; }) for: "foo" matches undescribed predicate
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CmdLine.tests.cpp:<line number>: passed: result for: {?}
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CmdLine.tests.cpp:<line number>: passed: config.processName == "" for: "" == ""
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@ -1299,6 +1299,6 @@ due to unexpected exception with message:
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Why would you throw a std::string?
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===============================================================================
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test cases: 266 | 199 passed | 63 failed | 4 failed as expected
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assertions: 1449 | 1304 passed | 124 failed | 21 failed as expected
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test cases: 267 | 200 passed | 63 failed | 4 failed as expected
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assertions: 1453 | 1308 passed | 124 failed | 21 failed as expected
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@ -6192,6 +6192,40 @@ Condition.tests.cpp:<line number>: PASSED:
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with expansion:
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0 != 0x<hex digits>
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-------------------------------------------------------------------------------
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Precision of floating point stringification can be set
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Floats
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-------------------------------------------------------------------------------
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ToStringGeneral.tests.cpp:<line number>
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...............................................................................
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ToStringGeneral.tests.cpp:<line number>: PASSED:
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CHECK( str1.size() == 3 + 5 )
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with expansion:
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8 == 8
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ToStringGeneral.tests.cpp:<line number>: PASSED:
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REQUIRE( str2.size() == 3 + 10 )
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with expansion:
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13 == 13
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-------------------------------------------------------------------------------
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Precision of floating point stringification can be set
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Double
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-------------------------------------------------------------------------------
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ToStringGeneral.tests.cpp:<line number>
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...............................................................................
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ToStringGeneral.tests.cpp:<line number>: PASSED:
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CHECK( str1.size() == 2 + 5 )
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with expansion:
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7 == 7
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ToStringGeneral.tests.cpp:<line number>: PASSED:
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REQUIRE( str2.size() == 2 + 15 )
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with expansion:
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17 == 17
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-------------------------------------------------------------------------------
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Predicate matcher can accept const char*
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-------------------------------------------------------------------------------
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@ -11389,6 +11423,6 @@ Misc.tests.cpp:<line number>
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Misc.tests.cpp:<line number>: PASSED:
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===============================================================================
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test cases: 266 | 183 passed | 79 failed | 4 failed as expected
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assertions: 1466 | 1304 passed | 141 failed | 21 failed as expected
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test cases: 267 | 184 passed | 79 failed | 4 failed as expected
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assertions: 1470 | 1308 passed | 141 failed | 21 failed as expected
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@ -1,7 +1,7 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<testsuitesloose text artifact
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>
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<testsuite name="<exe-name>" errors="17" failures="125" tests="1467" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
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<testsuite name="<exe-name>" errors="17" failures="125" tests="1471" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
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<properties>
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<property name="filters" value="~[!nonportable]~[!benchmark]~[approvals]"/>
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<property name="random-seed" value="1"/>
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@ -574,6 +574,8 @@ Message.tests.cpp:<line number>
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<testcase classname="<exe-name>.global" name="Parse test names and tags/empty quoted name" time="{duration}"/>
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<testcase classname="<exe-name>.global" name="Parse test names and tags/quoted string followed by tag exclusion" time="{duration}"/>
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<testcase classname="<exe-name>.global" name="Pointers can be compared to null" time="{duration}"/>
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<testcase classname="<exe-name>.global" name="Precision of floating point stringification can be set/Floats" time="{duration}"/>
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<testcase classname="<exe-name>.global" name="Precision of floating point stringification can be set/Double" time="{duration}"/>
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<testcase classname="<exe-name>.global" name="Predicate matcher can accept const char*" time="{duration}"/>
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<testcase classname="<exe-name>.global" name="Process can be configured on command line/empty args don't cause a crash" time="{duration}"/>
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<testcase classname="<exe-name>.global" name="Process can be configured on command line/default - no arguments" time="{duration}"/>
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@ -7778,6 +7778,47 @@ Nor would this
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</Expression>
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<OverallResult success="true"/>
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</TestCase>
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<TestCase name="Precision of floating point stringification can be set" tags="[floatingPoint][toString]" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
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<Section name="Floats" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
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<Expression success="true" type="CHECK" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
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<Original>
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str1.size() == 3 + 5
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</Original>
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<Expanded>
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8 == 8
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</Expanded>
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</Expression>
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<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
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<Original>
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str2.size() == 3 + 10
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</Original>
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<Expanded>
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13 == 13
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</Expanded>
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</Expression>
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<OverallResults successes="2" failures="0" expectedFailures="0"/>
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</Section>
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<Section name="Double" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
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<Expression success="true" type="CHECK" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
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<Original>
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str1.size() == 2 + 5
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</Original>
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<Expanded>
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7 == 7
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</Expanded>
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</Expression>
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<Expression success="true" type="REQUIRE" filename="projects/<exe-name>/UsageTests/ToStringGeneral.tests.cpp" >
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<Original>
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str2.size() == 2 + 15
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</Original>
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<Expanded>
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17 == 17
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</Expanded>
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</Expression>
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<OverallResults successes="2" failures="0" expectedFailures="0"/>
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</Section>
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<OverallResult success="true"/>
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</TestCase>
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<TestCase name="Predicate matcher can accept const char*" tags="[compilation][matchers]" filename="projects/<exe-name>/UsageTests/Matchers.tests.cpp" >
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<Expression success="true" type="REQUIRE_THAT" filename="projects/<exe-name>/UsageTests/Matchers.tests.cpp" >
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<Original>
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@ -13728,7 +13769,7 @@ loose text artifact
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</Section>
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<OverallResult success="true"/>
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</TestCase>
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<OverallResults successes="1304" failures="142" expectedFailures="21"/>
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<OverallResults successes="1308" failures="142" expectedFailures="21"/>
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</Group>
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<OverallResults successes="1304" failures="141" expectedFailures="21"/>
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<OverallResults successes="1308" failures="141" expectedFailures="21"/>
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</Catch>
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@ -128,6 +128,40 @@ TEST_CASE("String views are stringified like other strings", "[toString][approva
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#endif
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TEST_CASE("Precision of floating point stringification can be set", "[toString][floatingPoint]") {
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SECTION("Floats") {
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using sm = Catch::StringMaker<float>;
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const auto oldPrecision = sm::precision;
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const float testFloat = 1.12345678901234567899f;
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auto str1 = sm::convert(testFloat);
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sm::precision = 5;
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// "1." prefix = 2 chars, f suffix is another char
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CHECK(str1.size() == 3 + 5);
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sm::precision = 10;
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auto str2 = sm::convert(testFloat);
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REQUIRE(str2.size() == 3 + 10);
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sm::precision = oldPrecision;
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}
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SECTION("Double") {
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using sm = Catch::StringMaker<double>;
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const auto oldPrecision = sm::precision;
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const double testDouble = 1.123456789012345678901234567899;
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sm::precision = 5;
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auto str1 = sm::convert(testDouble);
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// "1." prefix = 2 chars
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CHECK(str1.size() == 2 + 5);
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sm::precision = 15;
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auto str2 = sm::convert(testDouble);
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REQUIRE(str2.size() == 2 + 15);
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sm::precision = oldPrecision;
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}
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}
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namespace {
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struct WhatException : std::exception {
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