port tests for mergeLines

js: 867b7f4be01126663df609756049515a41e700d1

test/merge_lines.cpp

@@ -0,0 +1,73 @@
+#include "gtest/gtest.h"
+
+#include <mbgl/util/merge_lines.hpp>
+
+
+TEST(mergeLines, mergeLines) {
+
+    std::u32string a = U"a";
+    std::u32string b = U"b";
+
+    // merges lines with the same text
+    std::vector<mbgl::SymbolFeature> input1 = {
+        { {{{0, 0}, {1, 0}, {2, 0}}}, a, "" },
+        { {{{4, 0}, {5, 0}, {6, 0}}}, b, "" },
+        { {{{8, 0}, {9, 0}}}, a, "" },
+        { {{{2, 0}, {3, 0}, {4, 0}}}, a, "" },
+        { {{{6, 0}, {7, 0}, {8, 0}}}, a, "" },
+        { {{{5, 0}, {6, 0}}}, a, "" }
+    };
+
+    std::vector<mbgl::SymbolFeature> expected1 = {
+        { {{{0, 0}, {1, 0}, {2, 0}, {3, 0}, {4, 0}}}, a, "" },
+        { {{{4, 0}, {5, 0}, {6, 0}}}, b, "" },
+        { {{{5, 0}, {6, 0}, {7, 0}, {8, 0}, {9, 0}}}, a, "" },
+        { {{}}, a, "" },
+        { {{}}, a, "" },
+        { {{}}, a, "" }
+    };
+
+    mbgl::util::mergeLines(input1);
+
+    for (int i = 0; i < 6; i++) {
+        EXPECT_EQ(input1[i].geometry, expected1[i].geometry);
+    }
+
+    // mergeLines handles merge from both ends
+    std::vector<mbgl::SymbolFeature> input2 = {
+        { {{{0, 0}, {1, 0}, {2, 0}}}, a, "" },
+        { {{{4, 0}, {5, 0}, {6, 0}}}, a, "" },
+        { {{{2, 0}, {3, 0}, {4, 0}}}, a, "" }
+    };
+
+    std::vector<mbgl::SymbolFeature> expected2 = {
+        { {{{0, 0}, {1, 0}, {2, 0}, {3, 0}, {4, 0}, {5, 0}, {6, 0}}}, a, "" },
+        { {{}}, a, "" },
+        { {{}}, a, "" }
+    };
+
+    mbgl::util::mergeLines(input2);
+
+    for (int i = 0; i < 3; i++) {
+        EXPECT_EQ(input2[i].geometry, expected2[i].geometry);
+    }
+
+    // mergeLines handles circular lines
+    std::vector<mbgl::SymbolFeature> input3 = {
+        { {{{0, 0}, {1, 0}, {2, 0}}}, a, "" },
+        { {{{2, 0}, {3, 0}, {4, 0}}}, a, "" },
+        { {{{4, 0}, {0, 0}}}, a, "" }
+    };
+
+    std::vector<mbgl::SymbolFeature> expected3 = {
+        { {{{0, 0}, {1, 0}, {2, 0}, {3, 0}, {4, 0}, {0, 0}}}, a, "" },
+        { {{}}, a, "" },
+        { {{}}, a, "" }
+    };
+
+    mbgl::util::mergeLines(input3);
+
+    for (int i = 0; i < 3; i++) {
+        EXPECT_EQ(input3[i].geometry, expected3[i].geometry);
+    }
+}

test/test.gyp

@@ -167,6 +167,25 @@
         }]
       ]
     },
+    { 'target_name': 'merge_lines',
+      'product_name': 'test_merge_lines',
+      'type': 'executable',
+      'sources': [
+        './main.cpp',
+        './merge_lines.cpp',
+      ],
+      'dependencies': [
+        '../deps/gtest/gtest.gyp:gtest',
+        '../mapboxgl.gyp:mbgl-standalone',
+      ],
+      'include_dirs': [ '../src' ],
+      'conditions': [
+        ['OS == "mac"', { 'xcode_settings': { 'OTHER_LDFLAGS': [ '<@(ldflags)' ] }
+        }, {
+          'libraries': [ '<@(ldflags)' ],
+        }]
+      ]
+    },
     { 'target_name': 'headless',
       'product_name': 'test_headless',
       'type': 'executable',
@@ -236,6 +255,7 @@
         'variant',
         'tile',
         'functions',
+        'merge_lines',
         'headless',
         'style_parser',
         'comparisons',