add coverage for Builder::is_host_target

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/bootstrap/src/core/builder/tests.rs

@@ -1065,3 +1065,18 @@ fn test_prebuilt_llvm_config_path_resolution() {
         .join(exe("llvm-config", builder.config.build));
     assert_eq!(expected, actual);
 }
+
+fn test_is_host_target() {
+    let target1 = TargetSelection::from_user(TEST_TRIPLE_1);
+    let target2 = TargetSelection::from_user(TEST_TRIPLE_2);
+
+    for (target1, target2) in [(target1, target2), (target2, target1)] {
+        let mut config = configure("build", &[], &[]);
+        config.build = target1;
+        let build = Build::new(config);
+        let builder = Builder::new(&build);
+
+        assert!(builder.is_host_target(&target1));
+        assert!(!builder.is_host_target(&target2));
+    }
+}