diff --git a/include/internal/TestCPPTestCase.h b/include/internal/TestCPPTestCase.h
index da4698b..e425b53 100644
--- a/include/internal/TestCPPTestCase.h
+++ b/include/internal/TestCPPTestCase.h
@@ -289,7 +289,7 @@ namespace TestCPP {
          * @param out The stream to write the test failure reason to.
          * @param reason The test failure reason to write.
          */
-        void logFailure (ostream& out, const string& reason);
+        void logFailure (ostream& out, const string& reason) const;
         /**
          * @brief If a test encounters an error while running, this
          *          function will be called to log the test error.
diff --git a/include/internal/TestCPPTestSuite.h b/include/internal/TestCPPTestSuite.h
index 57780d2..fdfe4c3 100644
--- a/include/internal/TestCPPTestSuite.h
+++ b/include/internal/TestCPPTestSuite.h
@@ -145,7 +145,7 @@ namespace TestCPP {
          * @return The total number of tests that failed in the last
          *          suite run.
          */
-        unsigned getLastRunFailCount ();
+        unsigned getLastRunFailCount () const;
 
         /**
          * @brief Retrieve the total number of tests in the suite that
@@ -153,7 +153,7 @@ namespace TestCPP {
          * @return The total number of tests that passed in the last
          *          suite run.
          */
-        unsigned getLastRunSuccessCount();
+        unsigned getLastRunSuccessCount() const;
 
         /**
          * @brief Run all tests in the test suite.
diff --git a/include/internal/TestCPPUtil.h b/include/internal/TestCPPUtil.h
index 256c450..c869e5b 100644
--- a/include/internal/TestCPPUtil.h
+++ b/include/internal/TestCPPUtil.h
@@ -78,7 +78,7 @@ namespace TestCPP {
          * @return The name of the TestCPP object that this object
          *          names.
          */
-        const string& getName ();
+        const string& getName () const;
 
         /**
          * @brief Output the test object name to the specified stream.
@@ -88,7 +88,7 @@ namespace TestCPP {
          */
         friend std::ostream& operator<< (
             std::ostream& s,
-            TestObjName& tcName
+            const TestObjName& tcName
         );
 
     private:
diff --git a/src/TestCPPTestCase.cpp b/src/TestCPPTestCase.cpp
index 8c8bbf2..46e3c11 100644
--- a/src/TestCPPTestCase.cpp
+++ b/src/TestCPPTestCase.cpp
@@ -291,7 +291,7 @@ namespace TestCPP {
         return this->lastRunTime;
     }
 
-    void TestCase::logFailure(ostream& out, const string& reason) {
+    void TestCase::logFailure(ostream& out, const string& reason) const {
         out << fixed;
         out << setprecision(TCPPNum::TIME_PRECISION);
         out << TCPPStr::TEST << this->testName << TCPPStr::FAIL
diff --git a/src/TestCPPTestSuite.cpp b/src/TestCPPTestSuite.cpp
index cfd7f21..623e374 100644
--- a/src/TestCPPTestSuite.cpp
+++ b/src/TestCPPTestSuite.cpp
@@ -70,11 +70,11 @@ namespace TestCPP {
         this->suiteName = std::move(testSuiteName);
     }
 
-    unsigned TestSuite::getLastRunFailCount () {
+    unsigned TestSuite::getLastRunFailCount () const {
         return this->lastRunFailCount;
     }
 
-    unsigned TestSuite::getLastRunSuccessCount() {
+    unsigned TestSuite::getLastRunSuccessCount() const {
         return this->lastRunSuccessCount;
     }
 
diff --git a/src/TestCPPUtil.cpp b/src/TestCPPUtil.cpp
index 7d13eb1..ec8f887 100644
--- a/src/TestCPPUtil.cpp
+++ b/src/TestCPPUtil.cpp
@@ -56,13 +56,13 @@ namespace TestCPP {
         }
     }
 
-    const string& TestObjName::getName () {
+    const string& TestObjName::getName () const {
         return this->testCaseName;
     }
 
     std::ostream& operator<< (
         std::ostream& s,
-        TestObjName& tcName
+        const TestObjName& tcName
     )
     {
         s << tcName.getName();