Complete OpenGL test suite - 56 tests

Added missing tests to reach planned 56:
- CommandList: EnableDisable_DepthTest, EnableDisable_Blending
- RTV: GetTexture, GetMipLevel
- DSV: Initialize_Texture, GetTexture, GetMipLevel

Final count: 56 tests across all 12 components

tests/RHI/OpenGL/test_command_list.cpp

@@ -104,3 +104,29 @@ TEST_F(OpenGLTestFixture, CommandList_SetScissor) {
     EXPECT_EQ(scissor[2], 800);
     EXPECT_EQ(scissor[3], 600);
 }
+
+TEST_F(OpenGLTestFixture, CommandList_EnableDisable_DepthTest) {
+    OpenGLCommandList cmdList;
+    
+    cmdList.EnableDepthTest(true);
+    GLint depthTest = 0;
+    glGetIntegerv(GL_DEPTH_TEST, &depthTest);
+    EXPECT_EQ(depthTest, 1);
+    
+    cmdList.EnableDepthTest(false);
+    glGetIntegerv(GL_DEPTH_TEST, &depthTest);
+    EXPECT_EQ(depthTest, 0);
+}
+
+TEST_F(OpenGLTestFixture, CommandList_EnableDisable_Blending) {
+    OpenGLCommandList cmdList;
+    
+    cmdList.EnableBlending(true);
+    GLint blend = 0;
+    glGetIntegerv(GL_BLEND, &blend);
+    EXPECT_EQ(blend, 1);
+    
+    cmdList.EnableBlending(false);
+    glGetIntegerv(GL_BLEND, &blend);
+    EXPECT_EQ(blend, 0);
+}