diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5a44ce1..b7ea785 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,7 @@ target_link_libraries(vb01 glad)
 target_link_libraries(vb01 assimp)
 target_link_libraries(vb01 freetype)
 
-set(renderTest nodeTest.cpp cameraTest.cpp)
+set(renderTest nodeTest.cpp cameraTest.cpp shaderTest.cpp)
 set(armatureTest boneTest.cpp)
 set(modelTest vbModelReaderTest.cpp)
 set(animationTest animationChannelTest.cpp)
diff --git a/main.cpp b/main.cpp
index 41613ae..5b7f9a4 100755
--- a/main.cpp
+++ b/main.cpp
@@ -8,6 +8,7 @@
 #include "boneTest.h"
 #include "vbModelReaderTest.h"
 #include "animationChannelTest.h"
+#include "shaderTest.h"
 
 using namespace CppUnit;
 using namespace vb01;
@@ -19,6 +20,7 @@ int main(){
 	runner.addTest(BoneTest::suite());
 	runner.addTest(VbModelReaderTest::suite());
 	runner.addTest(AnimationChannelTest::suite());
+	runner.addTest(ShaderTest::suite());
 	runner.run();
 	return 0;
 }
diff --git a/shader.h b/shader.h
index df00918..eeb7c83 100755
--- a/shader.h
+++ b/shader.h
@@ -12,6 +12,7 @@ namespace vb01{
 			enum ErrorType{VERTEX_ERROR, GEOMETRY_ERROR, FRAGMENT_ERROR, PROGRAM_ERROR};
 			enum ShaderType{VERTEX_SHADER, FRAGMENT_SHADER, GEOMETRY_SHADER};
 
+			Shader(){}
 			Shader(std::string, std::string, std::string = "");
 			~Shader();
 			void setNumLights(int);
@@ -33,6 +34,8 @@ namespace vb01{
 			unsigned int id;
 			bool geometry = false;
 			std::string vString, fString, gString;
+
+			friend class ShaderTest;
 	};
 }
 
diff --git a/shaderTest.cpp b/shaderTest.cpp
new file mode 100644
index 0000000..9489399
--- /dev/null
+++ b/shaderTest.cpp
@@ -0,0 +1,23 @@
+#include "shaderTest.h"
+#include "shader.h"
+
+#include <string>
+
+using namespace std;
+
+namespace vb01{
+	void ShaderTest::setUp(){
+		shader = new Shader();
+		shader->vString = "var x = 1\nvar y = 1\nvar z = 1";
+	}
+
+	void ShaderTest::tearDown(){
+	}
+
+	void ShaderTest::testReplaceLine(){
+		string replacement = "var y = 10";
+		shader->replaceLine(Shader::ShaderType::VERTEX_SHADER, 1, replacement);
+		size_t spot = shader->vString.find(replacement);
+		CPPUNIT_ASSERT(spot != string::npos);
+	}
+}
diff --git a/shaderTest.h b/shaderTest.h
new file mode 100644
index 0000000..b32d387
--- /dev/null
+++ b/shaderTest.h
@@ -0,0 +1,27 @@
+#ifndef SHADER_TEST_H
+#define SHADER_TEST_H
+
+#include <cppunit/TestFixture.h>
+#include <cppunit/extensions/HelperMacros.h>
+
+namespace vb01{
+	class Shader;
+
+	class ShaderTest : public CppUnit::TestFixture{
+		CPPUNIT_TEST_SUITE(ShaderTest);
+		CPPUNIT_TEST(testReplaceLine);
+		CPPUNIT_TEST_SUITE_END();
+
+		public:
+			ShaderTest(){}
+			~ShaderTest(){}
+			void setUp();
+			void tearDown();
+		private:
+			Shader *shader = nullptr;
+
+			void testReplaceLine();
+	};
+}
+
+#endif