1 files changed, 28 insertions, 2 deletions
diff --git a/tools/aapt2/link/ManifestFixer_test.cpp b/tools/aapt2/link/ManifestFixer_test.cpp
index 3aba4e2ec49f..0791805e2506 100644
--- a/tools/aapt2/link/ManifestFixer_test.cpp
+++ b/tools/aapt2/link/ManifestFixer_test.cpp
@@ -753,8 +753,7 @@ TEST_F(ManifestFixerTest, SupportKeySets) {
 }
 
 TEST_F(ManifestFixerTest, InsertCompileSdkVersions) {
-  std::string input = R"(
-      <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="android" />)";
+  std::string input = R"(<manifest package="com.pkg" />)";
   ManifestFixerOptions options;
   options.compile_sdk_version = {"28"};
   options.compile_sdk_version_codename = {"P"};
@@ -762,6 +761,12 @@ TEST_F(ManifestFixerTest, InsertCompileSdkVersions) {
   std::unique_ptr<xml::XmlResource> manifest = VerifyWithOptions(input, options);
   ASSERT_THAT(manifest, NotNull());
 
+  // There should be a declaration of kSchemaAndroid, even when the input
+  // didn't have one.
+  EXPECT_EQ(manifest->root->namespace_decls.size(), 1);
+  EXPECT_EQ(manifest->root->namespace_decls[0].prefix, "android");
+  EXPECT_EQ(manifest->root->namespace_decls[0].uri, xml::kSchemaAndroid);
+
   xml::Attribute* attr = manifest->root->FindAttribute(xml::kSchemaAndroid, "compileSdkVersion");
   ASSERT_THAT(attr, NotNull());
   EXPECT_THAT(attr->value, StrEq("28"));
@@ -808,6 +813,27 @@ TEST_F(ManifestFixerTest, OverrideCompileSdkVersions) {
   EXPECT_THAT(attr->value, StrEq("P"));
 }
 
+TEST_F(ManifestFixerTest, AndroidPrefixAlreadyUsed) {
+  std::string input =
+      R"(<manifest package="com.pkg"
+         xmlns:android="http://schemas.android.com/apk/prv/res/android"
+         android:private_attr="foo" />)";
+  ManifestFixerOptions options;
+  options.compile_sdk_version = {"28"};
+  options.compile_sdk_version_codename = {"P"};
+
+  std::unique_ptr<xml::XmlResource> manifest = VerifyWithOptions(input, options);
+  ASSERT_THAT(manifest, NotNull());
+
+  // Make sure that we don't redefine "android".
+  EXPECT_EQ(manifest->root->namespace_decls.size(), 2);
+  EXPECT_EQ(manifest->root->namespace_decls[0].prefix, "android");
+  EXPECT_EQ(manifest->root->namespace_decls[0].uri,
+            "http://schemas.android.com/apk/prv/res/android");
+  EXPECT_EQ(manifest->root->namespace_decls[1].prefix, "android0");
+  EXPECT_EQ(manifest->root->namespace_decls[1].uri, xml::kSchemaAndroid);
+}
+
 TEST_F(ManifestFixerTest, UnexpectedElementsInManifest) {
   std::string input = R"(
       <manifest xmlns:android="http://schemas.android.com/apk/res/android"