Text: a barebones minimal test for DistanceFieldGlyphCache.

Not great at all, but at least makes it possible to test the
initialization.

src/Magnum/Text/Test/CMakeLists.txt

@@ -51,6 +51,7 @@ set_target_properties(
     PROPERTIES FOLDER "Magnum/Text/Test")
 
 if(BUILD_GL_TESTS)
+    corrade_add_test(TextDistanceFieldGlyphCacheGLTest DistanceFieldGlyphCacheGLTest.cpp LIBRARIES MagnumText MagnumOpenGLTester)
     corrade_add_test(TextGlyphCacheGLTest GlyphCacheGLTest.cpp LIBRARIES MagnumText MagnumOpenGLTester)
     corrade_add_test(TextRendererGLTest RendererGLTest.cpp LIBRARIES MagnumText MagnumOpenGLTester)
 

src/Magnum/Text/Test/DistanceFieldGlyphCacheGLTest.cpp

@@ -0,0 +1,52 @@
+/*
+    This file is part of Magnum.
+
+    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
+              Vladimír Vondruš <mosra@centrum.cz>
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+*/
+
+#include "Magnum/GL/OpenGLTester.h"
+#include "Magnum/Text/DistanceFieldGlyphCache.h"
+
+namespace Magnum { namespace Text { namespace Test {
+
+struct DistanceFieldGlyphCacheGLTest: GL::OpenGLTester {
+    explicit DistanceFieldGlyphCacheGLTest();
+
+    void initialize();
+};
+
+DistanceFieldGlyphCacheGLTest::DistanceFieldGlyphCacheGLTest() {
+    addTests({&DistanceFieldGlyphCacheGLTest::initialize});
+}
+
+void DistanceFieldGlyphCacheGLTest::initialize() {
+    Text::DistanceFieldGlyphCache cache({1024, 2048}, {256, 256}, 16);
+    MAGNUM_VERIFY_NO_GL_ERROR();
+
+    #ifndef MAGNUM_TARGET_GLES
+    CORRADE_COMPARE(cache.texture().imageSize(0), (Vector2i{256, 256}));
+    #endif
+}
+
+}}}
+
+CORRADE_TEST_MAIN(Magnum::Text::Test::DistanceFieldGlyphCacheGLTest)