Add unit test for BCP 47 parsing.

2 files changed, 46 insertions, 0 deletions

diff --git a/cmake/test-files.cmake b/cmake/test-files.cmake
index 8105cbf5ce..561d965d20 100644
--- a/cmake/test-files.cmake
+++ b/cmake/test-files.cmake
@@ -117,6 +117,7 @@ set(MBGL_TEST_FILES
     test/text/cross_tile_symbol_index.test.cpp
     test/text/glyph_manager.test.cpp
     test/text/glyph_pbf.test.cpp
+    test/text/language_tag.test.cpp
     test/text/local_glyph_rasterizer.test.cpp
     test/text/quads.test.cpp
 
diff --git a/test/text/language_tag.test.cpp b/test/text/language_tag.test.cpp
new file mode 100644
index 0000000000..7d70088594
--- /dev/null
+++ b/test/text/language_tag.test.cpp
@@ -0,0 +1,45 @@
+#include <mbgl/test/util.hpp>
+
+#include <mbgl/text/language_tag.hpp>
+
+using namespace mbgl;
+
+TEST(LanguageTag, Parsing) {
+    LanguageTag bareLanguage = LanguageTag::fromBCP47("de");
+    EXPECT_EQ(*(bareLanguage.language), "de");
+    EXPECT_FALSE(bareLanguage.script);
+    EXPECT_FALSE(bareLanguage.region);
+    
+    LanguageTag languageAndScript = LanguageTag::fromBCP47("de-hans");
+    EXPECT_EQ(*(languageAndScript.language), "de");
+    EXPECT_EQ(*(languageAndScript.script), "hans");
+    EXPECT_FALSE(languageAndScript.region);
+    
+    LanguageTag languageAndRegion = LanguageTag::fromBCP47("de-US");
+    EXPECT_EQ(*(languageAndRegion.language), "de");
+    EXPECT_FALSE(languageAndRegion.script);
+    EXPECT_EQ(*(languageAndRegion.region), "US");
+    
+    LanguageTag kitchenSink = LanguageTag::fromBCP47("de-ext-two-Hans-US-variant-x-private");
+    EXPECT_EQ(*(kitchenSink.language), "de");
+    EXPECT_EQ(*(kitchenSink.script), "Hans");
+    EXPECT_EQ(*(kitchenSink.region), "US");
+}
+
+TEST(LanguageTag, Generation) {
+    LanguageTag deHansUS({"de"}, {"hans"}, {"US"});
+    EXPECT_EQ(deHansUS.toBCP47(), "de-hans-US");
+    
+    LanguageTag deUS({"de"}, {}, {"US"});
+    EXPECT_EQ(deUS.toBCP47(), "de-US");
+    
+    LanguageTag noLanguage({}, {"hans"}, {"US"});
+    EXPECT_EQ(noLanguage.toBCP47(), "");
+    
+    LanguageTag deHans({"de"}, {"hans"}, {});
+    EXPECT_EQ(deHans.toBCP47(), "de-hans");
+    
+    LanguageTag de({"de"}, {}, {});
+    EXPECT_EQ(de.toBCP47(), "de");
+}
+