diff --git a/tests/component/updater_test.cpp b/tests/component/updater_test.cpp
index fe4f45e..e8abb53 100644
--- a/tests/component/updater_test.cpp
+++ b/tests/component/updater_test.cpp
@@ -46,6 +46,7 @@
 #include "otautil/paths.h"
 #include "otautil/print_sha1.h"
 #include "otautil/sysutil.h"
+#include "private/commands.h"
 #include "updater/blockimg.h"
 #include "updater/install.h"
 #include "updater/updater.h"
@@ -150,6 +151,9 @@
     Paths::Get().set_last_command_file(temp_last_command_.path);
     Paths::Get().set_stash_directory_base(temp_stash_base_.path);
 
+    // Enable a special command "abort" to simulate interruption.
+    Command::abort_allowed_ = true;
+
     last_command_file_ = temp_last_command_.path;
     image_file_ = image_temp_file_.path;
   }
@@ -580,7 +584,7 @@
     "2",
     "stash " + src_hash + " 2,0,2",
     "free " + src_hash,
-    "fail",
+    "abort",
     // clang-format on
   };
 
@@ -714,7 +718,7 @@
     "stash " + block1_hash + " 2,0,1",
     "move " + block1_hash + " 2,1,2 1 2,0,1",
     "stash " + block3_hash + " 2,2,3",
-    "fail",
+    "abort",
     // clang-format on
   };
 
@@ -859,6 +863,9 @@
     Paths::Get().set_last_command_file(temp_last_command_.path);
     Paths::Get().set_stash_directory_base(temp_stash_base_.path);
 
+    // Enable a special command "abort" to simulate interruption.
+    Command::abort_allowed_ = true;
+
     index_ = GetParam();
     image_file_ = image_temp_file_.path;
     last_command_file_ = temp_last_command_.path;
@@ -1030,7 +1037,7 @@
             << g_transfer_list[kTransferListHeaderLines + index_] << ")";
 
   std::vector<std::string> transfer_list_copy{ g_transfer_list };
-  transfer_list_copy[kTransferListHeaderLines + index_] = "fail";
+  transfer_list_copy[kTransferListHeaderLines + index_] = "abort";
 
   g_entries["transfer_list"] = android::base::Join(transfer_list_copy, '\n');
 
diff --git a/tests/unit/commands_test.cpp b/tests/unit/commands_test.cpp
index cb2be91..3daa58f 100644
--- a/tests/unit/commands_test.cpp
+++ b/tests/unit/commands_test.cpp
@@ -159,6 +159,27 @@
   ASSERT_EQ("invalid type", err);
 }
 
+TEST(CommandsTest, Parse_ABORT_Allowed) {
+  Command::abort_allowed_ = true;
+
+  const std::string input{ "abort" };
+  std::string err;
+  Command command = Command::Parse(input, 0, &err);
+  ASSERT_TRUE(command);
+
+  ASSERT_EQ(TargetInfo(), command.target());
+  ASSERT_EQ(SourceInfo(), command.source());
+  ASSERT_EQ(StashInfo(), command.stash());
+  ASSERT_EQ(PatchInfo(), command.patch());
+}
+
+TEST(CommandsTest, Parse_ABORT_NotAllowed) {
+  const std::string input{ "abort" };
+  std::string err;
+  Command command = Command::Parse(input, 0, &err);
+  ASSERT_FALSE(command);
+}
+
 TEST(CommandsTest, Parse_BSDIFF) {
   const std::string input{
     "bsdiff 0 148 "
@@ -312,9 +333,12 @@
 }
 
 TEST(CommandsTest, Parse_InvalidNumberOfArgs) {
+  Command::abort_allowed_ = true;
+
   // Note that the case of having excess args in BSDIFF, IMGDIFF and MOVE is covered by
   // ParseTargetInfoAndSourceInfo_InvalidInput.
   std::vector<std::string> inputs{
+    "abort foo",
     "bsdiff",
     "erase",
     "erase 4,3,5,10,12 hash1",
diff --git a/updater/blockimg.cpp b/updater/blockimg.cpp
index 937c5e1..fc71385 100644
--- a/updater/blockimg.cpp
+++ b/updater/blockimg.cpp
@@ -1489,6 +1489,11 @@
   return 0;
 }
 
+static int PerformCommandAbort(CommandParameters&) {
+  LOG(INFO) << "Aborting as instructed";
+  return -1;
+}
+
 using CommandFunction = std::function<int(CommandParameters&)>;
 
 using CommandMap = std::unordered_map<Command::Type, CommandFunction>;
@@ -1888,6 +1893,7 @@
   // Commands which are not allowed are set to nullptr to skip them completely.
   const CommandMap command_map{
     // clang-format off
+    { Command::Type::ABORT,   PerformCommandAbort },
     { Command::Type::BSDIFF,  PerformCommandDiff },
     { Command::Type::ERASE,   nullptr },
     { Command::Type::FREE,    PerformCommandFree },
@@ -1908,6 +1914,7 @@
                           const std::vector<std::unique_ptr<Expr>>& argv) {
   const CommandMap command_map{
     // clang-format off
+    { Command::Type::ABORT,   PerformCommandAbort },
     { Command::Type::BSDIFF,  PerformCommandDiff },
     { Command::Type::ERASE,   PerformCommandErase },
     { Command::Type::FREE,    PerformCommandFree },
diff --git a/updater/commands.cpp b/updater/commands.cpp
index fb19ebc..e881496 100644
--- a/updater/commands.cpp
+++ b/updater/commands.cpp
@@ -29,8 +29,16 @@
 
 using namespace std::string_literals;
 
+bool Command::abort_allowed_ = false;
+
 Command::Type Command::ParseType(const std::string& type_str) {
-  if (type_str == "bsdiff") {
+  if (type_str == "abort") {
+    if (!abort_allowed_) {
+      LOG(ERROR) << "ABORT disallowed";
+      return Type::LAST;
+    }
+    return Type::ABORT;
+  } else if (type_str == "bsdiff") {
     return Type::BSDIFF;
   } else if (type_str == "erase") {
     return Type::ERASE;
@@ -237,6 +245,13 @@
             src_hash, &source_info, err)) {
       return {};
     }
+  } else if (op == Type::ABORT) {
+    // No-op, other than sanity checking the input args.
+    if (pos != tokens.size()) {
+      *err = android::base::StringPrintf("invalid number of args: %zu (expected 0)",
+                                         tokens.size() - pos);
+      return {};
+    }
   } else {
     *err = "invalid op";
     return {};
diff --git a/updater/include/private/commands.h b/updater/include/private/commands.h
index 784892f..087d7cf 100644
--- a/updater/include/private/commands.h
+++ b/updater/include/private/commands.h
@@ -213,9 +213,13 @@
 //      - Free the given stash data.
 //      - Meaningful args: StashInfo
 //
+//    abort
+//      - Abort the current update. Allowed for testing code only.
+//
 class Command {
  public:
   enum class Type {
+    ABORT,
     BSDIFF,
     ERASE,
     FREE,
@@ -280,6 +284,11 @@
   }
 
  private:
+  friend class ResumableUpdaterTest;
+  friend class UpdaterTest;
+
+  FRIEND_TEST(CommandsTest, Parse_ABORT_Allowed);
+  FRIEND_TEST(CommandsTest, Parse_InvalidNumberOfArgs);
   FRIEND_TEST(CommandsTest, ParseTargetInfoAndSourceInfo_InvalidInput);
   FRIEND_TEST(CommandsTest, ParseTargetInfoAndSourceInfo_StashesOnly);
   FRIEND_TEST(CommandsTest, ParseTargetInfoAndSourceInfo_SourceBlocksAndStashes);
@@ -293,6 +302,9 @@
                                            const std::string& src_hash, SourceInfo* source,
                                            std::string* err);
 
+  // Allows parsing ABORT command, which should be used for testing purpose only.
+  static bool abort_allowed_;
+
   // The type of the command.
   Type type_{ Type::LAST };
   // The index of the Command object, which is specified by the caller.