MeshTools: ensure a corner case in interleave() is tested as well.

src/Magnum/MeshTools/Test/InterleaveTest.cpp

@@ -44,8 +44,9 @@ struct InterleaveTest: Corrade::TestSuite::Tester {
     void attributeCountGaps();
     void stride();
     void strideGaps();
-    void write();
+    void interleave();
-    void writeGaps();
+    void interleaveGaps();
+    void interleaveEmpty();
 
     void interleaveInto();
 
@@ -84,8 +85,9 @@ InterleaveTest::InterleaveTest() {
               &InterleaveTest::attributeCountGaps,
               &InterleaveTest::stride,
               &InterleaveTest::strideGaps,
-              &InterleaveTest::write,
+              &InterleaveTest::interleave,
-              &InterleaveTest::writeGaps,
+              &InterleaveTest::interleaveGaps,
+              &InterleaveTest::interleaveEmpty,
 
               &InterleaveTest::interleaveInto,
 
@@ -148,7 +150,7 @@ void InterleaveTest::strideGaps() {
     CORRADE_COMPARE((Implementation::Stride{}(2, std::vector<Byte>(), 1, std::vector<Int>(), 12)), std::size_t(20));
 }
 
-void InterleaveTest::write() {
+void InterleaveTest::interleave() {
     const Containers::Array<char> data = MeshTools::interleave(
         std::vector<Byte>{0, 1, 2},
         std::vector<Int>{3, 4, 5},
@@ -169,7 +171,7 @@ void InterleaveTest::write() {
     }
 }
 
-void InterleaveTest::writeGaps() {
+void InterleaveTest::interleaveGaps() {
     const Containers::Array<char> data = MeshTools::interleave(
         std::vector<Byte>{0, 1, 2}, 3,
         std::vector<Int>{3, 4, 5},
@@ -192,6 +194,11 @@ void InterleaveTest::writeGaps() {
     }
 }
 
+void InterleaveTest::interleaveEmpty() {
+    const Containers::Array<char> data = MeshTools::interleave(std::vector<Byte>{}, 2);
+    CORRADE_COMPARE(data.size(), 0);
+}
+
 void InterleaveTest::interleaveInto() {
     Containers::Array<char> data{Containers::InPlaceInit, {
         0x11, 0x33, 0x55, 0x77, 0x11, 0x33, 0x55, 0x77, 0x11, 0x33, 0x55, 0x77,