Merge pull request #1614 from mlimber/master

Allow custom precision in error reports for floating-point numbers

1 files changed, 34 insertions, 0 deletions

diff --git a/projects/SelfTest/UsageTests/ToStringGeneral.tests.cpp b/projects/SelfTest/UsageTests/ToStringGeneral.tests.cpp
index 09ac3045..69d6320d 100644
--- a/projects/SelfTest/UsageTests/ToStringGeneral.tests.cpp
+++ b/projects/SelfTest/UsageTests/ToStringGeneral.tests.cpp
@@ -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 {