Test filling small mips of ETC textures.

src/tests/gl_tests/ETCTextureTest.cpp

@@ -52,7 +52,7 @@ TEST_P(ETCTextureTest, ETC1Validation)
 
     glBindTexture(GL_TEXTURE_2D, mTexture);
 
-    GLubyte pixel[8] = {0};
+    GLubyte pixel[8] = { 0x0, 0x0, 0xf8, 0x2, 0x43, 0xff, 0x4, 0x12 };
     glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_ETC1_RGB8_LOSSY_DECODE_ANGLE, 4, 4, 0,
                            sizeof(pixel), pixel);
     if (supported)
@@ -62,6 +62,12 @@ TEST_P(ETCTextureTest, ETC1Validation)
         glCompressedTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 4, 4, GL_ETC1_RGB8_LOSSY_DECODE_ANGLE,
                                   sizeof(pixel), pixel);
         EXPECT_GL_NO_ERROR();
+
+
+        glCompressedTexImage2D(GL_TEXTURE_2D, 1, GL_ETC1_RGB8_LOSSY_DECODE_ANGLE, 2, 2, 0,
+            sizeof(pixel), pixel);
+        glCompressedTexImage2D(GL_TEXTURE_2D, 2, GL_ETC1_RGB8_LOSSY_DECODE_ANGLE, 1, 1, 0,
+            sizeof(pixel), pixel);
     }
     else
     {