test(string_t):allow larger numeric representation

src/sourcery/sourcery_string_s.f90

@@ -25,8 +25,8 @@
   end procedure
 
   module procedure from_real
-    integer, parameter :: sign_ = 1, decimal_ = 1, digits = precision(x) + 3, exponent_width = 4
-    character(len=sign_ + decimal_ + digits + exponent_width) characters
+    integer, parameter :: sign_ = 1, decimal_ = 1, digits = precision(x) + 6, exponent = 4
+    character(len=sign_ + decimal_ + digits + exponent) characters
     write(characters, '(g0)') x
     string = string_t(characters)
   end procedure

test/string_test.f90

@@ -142,6 +142,7 @@ function assigns_character_to_string_t() result(passed)
     logical passed
     character(len=*), parameter :: rhs = "well, alrighty then"
     type(string_t) lhs
+
     lhs = rhs
     passed = lhs == rhs
   end function
@@ -157,34 +158,39 @@ function supports_concatenation_operator() result(passed)
 
   function constructs_from_default_integer() result(passed)
     logical passed
+
     associate(string => string_t(1234567890))
       passed = adjustl(trim(string%string())) == "1234567890"
     end associate
   end function
 
   function constructs_from_real() result(passed)
     logical passed
-    associate(string => string_t(123456789E+09))
-      passed = adjustl(trim(string%string())) == "0.123456791E+18"
+
+    associate(string => string_t(-1.53018260E-15))
+      passed = adjustl(trim(string%string())) == "-0.153018260E-14"
     end associate
   end function
 
   function extracts_file_base_name() result(passed)
     logical passed
+
     associate(string => string_t(" foo .bar.too "))
       passed = string%base_name() == "foo .bar"
     end associate
   end function
 
   function extracts_file_name_extension() result(passed)
     logical passed
+
     associate(string => string_t(" foo .bar.too "))
       passed = string%file_extension() == "too"
     end associate
   end function
 
   function concatenates_elements() result(passed)
     logical passed
+
     associate(elements => [string_t("foo"), string_t("bar")])
       passed = .cat. elements  == "foobar"
     end associate