[test] Add unit test for TaggedString::trim()

cmake/test-files.txt

@@ -115,6 +115,7 @@ test/text/glyph_pbf.test.cpp
 test/text/language_tag.test.cpp
 test/text/local_glyph_rasterizer.test.cpp
 test/text/quads.test.cpp
+test/text/tagged_string.test.cpp
 
 # tile
 test/tile/custom_geometry_tile.test.cpp

test/text/tagged_string.test.cpp

@@ -0,0 +1,27 @@
+
+#include <mbgl/test/util.hpp>
+
+#include <mbgl/text/tagged_string.hpp>
+
+using namespace mbgl;
+
+TEST(TaggedString, Trim) {
+    TaggedString basic(u" \t\ntrim that and not this  \n\t", SectionOptions(1.0f, 0));
+    basic.trim();
+    EXPECT_EQ(basic.rawText(), u"trim that and not this");
+    
+    TaggedString twoSections;
+    twoSections.addSection(u" \t\ntrim that", 1.5f, 1);
+    twoSections.addSection(u" and not this  \n\t", 0.5f, 2);
+    
+    twoSections.trim();
+    EXPECT_EQ(twoSections.rawText(), u"trim that and not this");
+    
+    TaggedString empty(u"\n\t\v \r  \t\n", SectionOptions(1.0f, 0));
+    empty.trim();
+    EXPECT_EQ(empty.rawText(), u"");
+    
+    TaggedString noTrim(u"no trim!", SectionOptions(1.0f, 0));
+    noTrim.trim();
+    EXPECT_EQ(noTrim.rawText(), u"no trim!");
+}