feat(const): added << operator to constant so that constants

also added tests for the stream operator

src/const/private/const.cpp

@@ -82,7 +82,7 @@ bool constants::load(const std::string& filename) {
         int start = 0;
 
         std::string symbol       = trim(line.substr(start, col_widths_[0])); start += col_widths_[0];
-        std::string name         = line.substr(start, col_widths_[1]); start += col_widths_[1];
+        std::string name         = trim(line.substr(start, col_widths_[1])); start += col_widths_[1];
         std::string valueStr     = line.substr(start, col_widths_[2]); start += col_widths_[2];
         std::string unit         = trim(line.substr(start, col_widths_[3])); start += col_widths_[3]; // Only trim the unit
         std::string uncertaintyStr = line.substr(start, col_widths_[4]); start += col_widths_[4];

src/const/public/const.h

@@ -16,6 +16,16 @@ struct constant {
   double uncertainty;       ///< Uncertainty in the constant's value
   std::string unit;         ///< Unit of the constant
   std::string reference;    ///< Reference for the constant's value
+
+  /**
+   * @brief overload the << operator for pretty printing
+   */
+   friend std::ostream& operator<<(std::ostream& os, const constant& c) {
+     os << "<" << c.name << ": ";
+     os << c.value << "±" << c.uncertainty << " ";
+     os << c.unit << " (" << c.reference << ")>\n";
+     return os;
+   }
 };
 
 /**

tests/const/constTest.cpp

@@ -4,6 +4,7 @@
 #include <string>
 #include <vector>
 #include <set>
+#include <sstream>
 
 std::string RELATIVE_PATH = "../src/resources/const/const.dat";
 /**
@@ -22,7 +23,6 @@ protected:
     void SetUp() override {
         // Create a DObject with initial data and metadata
         constants initializedConstants(RELATIVE_PATH);
-        std::cout << "speed of light (tests) " << initializedConstants["c"].value << std::endl;
     }
 };
 
@@ -88,7 +88,6 @@ TEST_F(constTest, Keys) {
 
     for (const auto& key : checkKeys) {
         bool found = keys.find(key) != keys.end();
-        std::cout << "FOUND SIMILAR KEY " << key << ", found: " << found << std::endl;
         EXPECT_TRUE(found);
     }
 
@@ -101,7 +100,16 @@ TEST_F(constTest, Keys) {
 
     for (const auto& key : checkBadKeys) {
         bool found = keys.find(key) != keys.end();
-        std::cout << "FOUND BAD KEY " << key << ", found: " << found << std::endl;
         EXPECT_FALSE(found);
     }
 }
+
+TEST_F(constTest, Output) {
+    constants obj(RELATIVE_PATH);
+    std::ostringstream os;
+
+    os << obj.get("c");
+    std::string expected = "<speed of light in vacuum: 2.99792e+10±0 cm / s (CODATA2022)>\n";
+
+    EXPECT_EQ(os.str(), expected);
+}