Add test case for overriding flag sequence

Bug: 187358499
Test: minikin_tests
Change-Id: I99cfc5b69c9edf0c91cece6cf8bd50ea4941f35a

5 files changed, 111 insertions, 0 deletions

diff --git a/tests/data/EmojiBase.ttf b/tests/data/EmojiBase.ttf
index 2e464f7..659226d 100644
--- a/tests/data/EmojiBase.ttf
+++ b/tests/data/EmojiBase.ttf
diff --git a/tests/data/EmojiBase.ttx b/tests/data/EmojiBase.ttx
index d33a2c0..e6e3da8 100644
--- a/tests/data/EmojiBase.ttx
+++ b/tests/data/EmojiBase.ttx
@@ -46,6 +46,12 @@
     <GlyphID id="18" name="LigaForm3"/>
     <GlyphID id="19" name="LigaForm4"/>
     <GlyphID id="20" name="LigaForm5"/>
+    <GlyphID id="21" name="LigaForm6"/>
+    <GlyphID id="22" name="LigaForm7"/>
+
+    <!-- Regional Indicators -->
+    <GlyphID id="23" name="U+1F1E6"/>
+    <GlyphID id="24" name="U+1F1E7"/>
 
   </GlyphOrder>
 
@@ -165,6 +171,8 @@
   <hmtx>
     <mtx name=".notdef" width="500" lsb="93"/>
     <mtx name="U+200D" width="500" lsb="93"/>
+    <mtx name="U+1F1E6" width="500" lsb="93"/>
+    <mtx name="U+1F1E7" width="500" lsb="93"/>
     <mtx name="U+1F3FB" width="500" lsb="93"/>
     <mtx name="U+1F3FC" width="500" lsb="93"/>
     <mtx name="U+1F9B0" width="500" lsb="93"/>
@@ -184,12 +192,16 @@
     <mtx name="LigaForm3" width="500" lsb="93"/>
     <mtx name="LigaForm4" width="500" lsb="93"/>
     <mtx name="LigaForm5" width="500" lsb="93"/>
+    <mtx name="LigaForm6" width="500" lsb="93"/>
+    <mtx name="LigaForm7" width="500" lsb="93"/>
   </hmtx>
 
   <cmap>
     <tableVersion version="0"/>
     <cmap_format_12 format="12" reserved="0" length="3" nGroups="6" platformID="3" platEncID="1" language="0">
       <map code="0x200D" name="U+200D" />
+      <map code="0x1F1E6" name="U+1F1E6" />
+      <map code="0x1F1E7" name="U+1F1E7" />
       <map code="0x1F3FB" name="U+1F3FB" />
       <map code="0x1F3FC" name="U+1F3FC" />
       <map code="0x1F9B0" name="U+1F9B0" />
@@ -234,6 +246,24 @@
       </contour>
       <instructions><assembly></assembly></instructions>
     </TTGlyph>
+    <TTGlyph name="U+1F1E6" xMin="0" yMin="0" xMax="100" yMax="100">
+      <contour>
+        <pt x="0" y="0" on="1" />
+        <pt x="100" y="0" on="1" />
+        <pt x="100" y="100" on="1" />
+        <pt x="0" y="100" on="1" />
+      </contour>
+      <instructions><assembly></assembly></instructions>
+    </TTGlyph>
+    <TTGlyph name="U+1F1E7" xMin="0" yMin="0" xMax="100" yMax="100">
+      <contour>
+        <pt x="0" y="0" on="1" />
+        <pt x="100" y="0" on="1" />
+        <pt x="100" y="100" on="1" />
+        <pt x="0" y="100" on="1" />
+      </contour>
+      <instructions><assembly></assembly></instructions>
+    </TTGlyph>
     <TTGlyph name="U+1F3FB" xMin="0" yMin="0" xMax="100" yMax="100">
       <contour>
         <pt x="0" y="0" on="1" />
@@ -405,6 +435,24 @@
       </contour>
       <instructions><assembly></assembly></instructions>
     </TTGlyph>
+    <TTGlyph name="LigaForm6" xMin="0" yMin="0" xMax="100" yMax="100">
+      <contour>
+        <pt x="0" y="0" on="1" />
+        <pt x="100" y="0" on="1" />
+        <pt x="100" y="100" on="1" />
+        <pt x="0" y="100" on="1" />
+      </contour>
+      <instructions><assembly></assembly></instructions>
+    </TTGlyph>
+    <TTGlyph name="LigaForm7" xMin="0" yMin="0" xMax="100" yMax="100">
+      <contour>
+        <pt x="0" y="0" on="1" />
+        <pt x="100" y="0" on="1" />
+        <pt x="100" y="100" on="1" />
+        <pt x="0" y="100" on="1" />
+      </contour>
+      <instructions><assembly></assembly></instructions>
+    </TTGlyph>
   </glyf>
 
   <name>
@@ -478,6 +526,10 @@
             <!-- U+1F9B6 U+1F3FB -> LigaForm3 -->
             <Ligature components="U+1F3FB" glyph="LigaForm3"/>
           </LigatureSet>
+          <LigatureSet glyph="U+1F1E6">
+            <Ligature components="U+1F1E6" glyph="LigaForm6"/>
+            <Ligature components="U+1F1E7" glyph="LigaForm7"/>
+          </LigatureSet>
         </LigatureSubst>
       </Lookup>
     </LookupList>
diff --git a/tests/data/OverrideEmoji.ttf b/tests/data/OverrideEmoji.ttf
index 06bb8ca..890796b 100644
--- a/tests/data/OverrideEmoji.ttf
+++ b/tests/data/OverrideEmoji.ttf
diff --git a/tests/data/OverrideEmoji.ttx b/tests/data/OverrideEmoji.ttx
index b484369..d5d4091 100644
--- a/tests/data/OverrideEmoji.ttx
+++ b/tests/data/OverrideEmoji.ttx
@@ -55,7 +55,14 @@
     <GlyphID id="19" name="LigaForm4"/>
     <GlyphID id="20" name="LigaForm5"/>
     -->
+    <GlyphID id="21" name="LigaForm6"/>
+    <!--
+      Following glyph is removed from EmojiBase.ttf for verifying fallback.
+    <GlyphID id="22" name="LigaForm7"/>
+    -->
 
+    <GlyphID id="23" name="U+1F1E6"/>
+    <GlyphID id="24" name="U+1F1E7"/>
   </GlyphOrder>
 
   <head>
@@ -174,6 +181,8 @@
   <hmtx>
     <mtx name=".notdef" width="500" lsb="93"/>
     <mtx name="U+200D" width="500" lsb="93"/>
+    <mtx name="U+1F1E6" width="500" lsb="93"/>
+    <mtx name="U+1F1E7" width="500" lsb="93"/>
     <mtx name="U+1F3FB" width="500" lsb="93"/>
     <mtx name="U+1F3FC" width="500" lsb="93"/>
     <mtx name="U+1F9B0" width="500" lsb="93"/>
@@ -203,12 +212,19 @@
     <mtx name="LigaForm4" width="500" lsb="93"/>
     <mtx name="LigaForm5" width="500" lsb="93"/>
     -->
+    <mtx name="LigaForm6" width="500" lsb="93"/>
+    <!--
+      Following glyph is removed from EmojiBase.ttf for verifying fallback.
+    <mtx name="LigaForm7" width="500" lsb="93"/>
+    -->
   </hmtx>
 
   <cmap>
     <tableVersion version="0"/>
     <cmap_format_12 format="12" reserved="0" length="3" nGroups="6" platformID="3" platEncID="1" language="0">
       <map code="0x200D" name="U+200D" />
+      <map code="0x1F1E6" name="U+1F1E6" />
+      <map code="0x1F1E7" name="U+1F1E7" />
       <map code="0x1F3FB" name="U+1F3FB" />
       <map code="0x1F3FC" name="U+1F3FC" />
       <map code="0x1F9B0" name="U+1F9B0" />
@@ -259,6 +275,24 @@
       </contour>
       <instructions><assembly></assembly></instructions>
     </TTGlyph>
+    <TTGlyph name="U+1F1E6" xMin="0" yMin="0" xMax="100" yMax="100">
+      <contour>
+        <pt x="0" y="0" on="1" />
+        <pt x="100" y="0" on="1" />
+        <pt x="100" y="100" on="1" />
+        <pt x="0" y="100" on="1" />
+      </contour>
+      <instructions><assembly></assembly></instructions>
+    </TTGlyph>
+    <TTGlyph name="U+1F1E7" xMin="0" yMin="0" xMax="100" yMax="100">
+      <contour>
+        <pt x="0" y="0" on="1" />
+        <pt x="100" y="0" on="1" />
+        <pt x="100" y="100" on="1" />
+        <pt x="0" y="100" on="1" />
+      </contour>
+      <instructions><assembly></assembly></instructions>
+    </TTGlyph>
     <TTGlyph name="U+1F3FB" xMin="0" yMin="0" xMax="100" yMax="100">
       <contour>
         <pt x="0" y="0" on="1" />
@@ -383,6 +417,19 @@
     <TTGlyph name="LigaForm4">
     <TTGlyph name="LigaForm5">
     -->
+    <TTGlyph name="LigaForm6" xMin="0" yMin="0" xMax="100" yMax="100">
+      <contour>
+        <pt x="0" y="0" on="1" />
+        <pt x="100" y="0" on="1" />
+        <pt x="100" y="100" on="1" />
+        <pt x="0" y="100" on="1" />
+      </contour>
+      <instructions><assembly></assembly></instructions>
+    </TTGlyph>
+    <!--
+      Following glyph is removed from EmojiBase.ttf for verifying fallback.
+    <TTGlyph name="LigaForm7">
+    -->
   </glyf>
 
   <name>
@@ -463,6 +510,10 @@
               <Ligature components="U+1F3FB" glyph="LigaForm3"/>
             </LigatureSet>
           -->
+          <LigatureSet glyph="U+1F1E6">
+            <Ligature components="U+1F1E6" glyph="LigaForm6"/>
+            <Ligature components="U+1F1E7" glyph=".notdef"/>
+          </LigatureSet>
         </LigatureSubst>
       </Lookup>
     </LookupList>
diff --git a/tests/unittest/FontCollectionItemizeTest.cpp b/tests/unittest/FontCollectionItemizeTest.cpp
index 96589c9..6f1e194 100644
--- a/tests/unittest/FontCollectionItemizeTest.cpp
+++ b/tests/unittest/FontCollectionItemizeTest.cpp
@@ -1670,4 +1670,12 @@ TEST(FontCollectionItemizeTest, emojiFallback) {
               itemizeEmojiAndFontPostScriptName("U+1F9B2 U+200D U+1F9B3 U+200D U+1F9B4"));
 }
 
+TEST(FontCollectionItemizeTest, emojiFlagFallback) {
+    // If the OverrideEmojiFont supports U+1F1E6 U+1F1E6, use that font.
+    EXPECT_EQ("OverrideEmojiFont", itemizeEmojiAndFontPostScriptName("U+1F1E6 U+1F1E6"));
+
+    // Even if the OverrideEmojiFont directs to .notdef (i.e. Tofu glyph) for the sequence, use it.
+    EXPECT_EQ("OverrideEmojiFont", itemizeEmojiAndFontPostScriptName("U+1F1E6 U+1F1E7"));
+}
+
 }  // namespace minikin