update test and format code

Author: phlptp

python/units_python.cpp

@@ -554,14 +554,12 @@ NB_MODULE(units_llnl_ext, mod)
         .def(
             "__format__",
             [](const units::precise_measurement& measurement,
-               std::string fmt_string) {
+               std::string fmt_string)->std::string {
                 std::string result;
                 if (fmt_string.empty()) {
                     result = units::to_string(measurement);
                 } else if (fmt_string == "-") {
-                    result = units::to_string(
-                        units::precise_measurement(
-                            measurement.value(), units::precise::one));
+                    result = std::to_string(measurement.value());
                 } else if (fmt_string.front() == '-') {
                     auto target_unit =
                         units::unit_from_string(fmt_string.substr(1));
@@ -576,9 +574,7 @@ NB_MODULE(units_llnl_ext, mod)
                             "Units are not compatible with given measurement " +
                             fmt_string.substr(1));
                     }
-                    result = units::to_string(
-                        units::precise_measurement(
-                            new_value, units::precise::one));
+                    result = std::to_string(new_value);
                 } else {
                     auto target_unit = units::unit_from_string(fmt_string);
                     if (!units::is_valid(target_unit)) {

test/python/test_measurement.py

@@ -265,11 +265,16 @@ def test_format():
     assert "kg" in s1
 
     s2 = f"the measurement is {m1:-}"
-    assert s2 == "the measurement is 9.7552 "
+    assert s2 == "the measurement is 9.755200"
 
     s3 = f"the measurement is {m1:-kg}"
     assert "kg" not in s3
 
+    m3=u.Measurement("3.4")
+
+    s4 = f"the measurement is {m3:-}"
+    assert "3.4" in s4
+
 
 def test_format_error():
     m1 = u.Measurement("9.7552 lb")