Add rust_test and update TEST_MAPPING

Test: atest -c --include-subdirs external/rust/crates
Change-Id: Ic38f234b8557ec5fc9ef424c6e6766c6e0dc4f29
diff --git a/Android.bp b/Android.bp
index 2e2d538..a38d4e2 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,4 +1,4 @@
-// This file is generated by cargo2android.py --run --dependencies.
+// This file is generated by cargo2android.py --run --dependencies --tests.
 
 rust_library_host {
     name: "libregex_syntax",
@@ -17,3 +17,23 @@
         "unicode-segment",
     ],
 }
+
+rust_test_host {
+    name: "regex-syntax_host_test_src_lib",
+    crate_name: "regex_syntax",
+    srcs: ["src/lib.rs"],
+    test_suites: ["general-tests"],
+    auto_gen_config: true,
+    edition: "2015",
+    features: [
+        "default",
+        "unicode",
+        "unicode-age",
+        "unicode-bool",
+        "unicode-case",
+        "unicode-gencat",
+        "unicode-perl",
+        "unicode-script",
+        "unicode-segment",
+    ],
+}
diff --git a/TEST_MAPPING b/TEST_MAPPING
new file mode 100644
index 0000000..2506375
--- /dev/null
+++ b/TEST_MAPPING
@@ -0,0 +1,9 @@
+// Generated by cargo2android.py for tests in Android.bp
+{
+  "presubmit": [
+    {
+      "name": "regex-syntax_host_test_src_lib",
+      "host": true
+    }
+  ]
+}