diff --git a/tests/const/constTest.cpp b/tests/const/constTest.cpp
new file mode 100644
index 0000000..9fd3a05
--- /dev/null
+++ b/tests/const/constTest.cpp
@@ -0,0 +1,107 @@
+#include <gtest/gtest.h>
+#include "const.h"
+#include <iostream>
+#include <string>
+#include <vector>
+#include <set>
+
+std::string RELATIVE_PATH = "../src/resources/const/const.dat";
+/**
+ * @file constTest.cpp
+ * @brief Unit tests for the const class.
+ */
+
+/**
+ * @brief Test suite for the const class.
+ */
+class constTest : public ::testing::Test {
+protected:
+    constants physicalConstants;
+    constants initializedConstants;
+
+    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;
+    }
+};
+
+/**
+ * @test Verify default constructor initializes correctly.
+ */
+TEST_F(constTest, DefaultConstructor) {
+    EXPECT_NO_THROW(constants());
+}
+
+/**
+ * @test Verify constructor initializes with provided data and metadata.
+ */
+TEST_F(constTest, ParameterizedConstructor) {
+    constants obj(RELATIVE_PATH);
+
+    EXPECT_NO_THROW(obj.is_loaded());
+}
+
+/**
+ * @test Verify get method returns the correct constant.
+ */
+TEST_F(constTest, Get) {
+    constants obj(RELATIVE_PATH);
+    EXPECT_DOUBLE_EQ(obj.get("c").value, 2.99792458e10);
+    EXPECT_EQ(obj.get("c").unit, "cm / s");
+    EXPECT_DOUBLE_EQ(obj.get("c").uncertainty, 0.0);
+    EXPECT_EQ(obj.get("c").reference, "CODATA2022");
+}
+
+/**
+ * @test Verify [] opperators returns the correct constant.
+ */
+TEST_F(constTest, Sub) {
+    constants obj(RELATIVE_PATH);
+    EXPECT_DOUBLE_EQ(obj["c"].value, 2.99792458e10);
+    EXPECT_EQ(obj["c"].unit, "cm / s");
+    EXPECT_DOUBLE_EQ(obj["c"].uncertainty, 0.0);
+    EXPECT_EQ(obj["c"].reference, "CODATA2022");
+}
+
+/**
+ * @test Verify that the has method returns the correct values
+ */
+TEST_F(constTest, Has) {
+    constants obj(RELATIVE_PATH);
+
+    EXPECT_TRUE(obj.has("c"));
+    EXPECT_FALSE(obj.has("c4"));
+    EXPECT_TRUE(obj.has("hbar"));
+}
+
+TEST_F(constTest, Keys) {
+    constants obj(RELATIVE_PATH);
+    std::set<std::string> checkKeys;
+    checkKeys.insert("c");
+    checkKeys.insert("wienK");
+    checkKeys.insert("hbar");
+    checkKeys.insert("g_h");
+    checkKeys.insert("R_sun");
+
+    std::set<std::string> keys = obj.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);
+    }
+
+    std::set<std::string> checkBadKeys;
+    checkBadKeys.insert("c4");
+    checkBadKeys.insert("wienK4");
+    checkBadKeys.insert("hbar4");
+    checkBadKeys.insert("g_h4");
+    checkBadKeys.insert("R_sun4");
+
+    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);
+    }
+}
\ No newline at end of file
diff --git a/tests/const/meson.build b/tests/const/meson.build
new file mode 100644
index 0000000..3ba1635
--- /dev/null
+++ b/tests/const/meson.build
@@ -0,0 +1,22 @@
+# Test files for const
+test_sources = [
+    'constTest.cpp',
+]
+
+foreach test_file : test_sources
+  exe_name = test_file.split('.')[0]
+  message('Building test: ' + exe_name)
+
+  # Create an executable target for each test
+  test_exe = executable(
+      exe_name,
+      test_file,
+      dependencies: gtest_dep,
+      include_directories: include_directories('../../src/const/public'),
+      link_with: libconst,  # Link the dobj library
+      install_rpath: '@loader_path/../../src'  # Ensure runtime library path resolves correctly
+  )
+
+  # Add the executable as a test
+  test(exe_name, test_exe)
+endforeach