diff --git a/crypto/cpu_arm_linux_test.cc b/crypto/cpu_arm_linux_test.cc
new file mode 100644
index 0000000..019b579
--- /dev/null
+++ b/crypto/cpu_arm_linux_test.cc
@@ -0,0 +1,239 @@
+/* Copyright (c) 2018, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include "cpu_arm_linux.h"
+
+#include <string.h>
+
+#include <gtest/gtest.h>
+
+
+TEST(ARMLinuxTest, CPUInfo) {
+  struct CPUInfoTest {
+    const char *cpuinfo;
+    unsigned long hwcap;
+    unsigned long hwcap2;
+    bool broken_neon;
+  } kTests[] = {
+      // https://crbug.com/341598#c33
+      {
+          "Processor: ARMv7 Processory rev 0 (v71)\n"
+          "processor: 0\n"
+          "BogoMIPS: 13.50\n"
+          "\n"
+          "Processor: 1\n"
+          "BogoMIPS: 13.50\n"
+          "\n"
+          "Features: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 "
+          "idiva idivt\n"
+          "CPU implementer : 0x51\n"
+          "CPU architecture: 7\n"
+          "CPU variant: 0x1\n"
+          "CPU part: 0x04d\n"
+          "CPU revision: 0\n"
+          "\n"
+          "Hardware: SAMSUNG M2\n"
+          "Revision: 0010\n"
+          "Serial: 00001e030000354e\n",
+          HWCAP_NEON,
+          0,
+          true,
+      },
+      // https://crbug.com/341598#c39
+      {
+          "Processor       : ARMv7 Processor rev 0 (v7l)\n"
+          "processor       : 0\n"
+          "BogoMIPS        : 13.53\n"
+          "\n"
+          "Features        : swp half thumb fastmult vfp edsp neon vfpv3 tls "
+          "vfpv4\n"
+          "CPU implementer : 0x51\n"
+          "CPU architecture: 7\n"
+          "CPU variant     : 0x1\n"
+          "CPU part        : 0x04d\n"
+          "CPU revision    : 0\n"
+          "\n"
+          "Hardware        : SAMSUNG M2_ATT\n"
+          "Revision        : 0010\n"
+          "Serial          : 0000df0c00004d4c\n",
+          HWCAP_NEON,
+          0,
+          true,
+      },
+      // Nexus 4 from https://crbug.com/341598#c43
+      {
+          "Processor       : ARMv7 Processor rev 2 (v7l)\n"
+          "processor       : 0\n"
+          "BogoMIPS        : 13.53\n"
+          "\n"
+          "processor       : 1\n"
+          "BogoMIPS        : 13.53\n"
+          "\n"
+          "processor       : 2\n"
+          "BogoMIPS        : 13.53\n"
+          "\n"
+          "processor       : 3\n"
+          "BogoMIPS        : 13.53\n"
+          "\n"
+          "Features        : swp half thumb fastmult vfp edsp neon vfpv3 tls "
+          "vfpv4 \n"
+          "CPU implementer : 0x51\n"
+          "CPU architecture: 7\n"
+          "CPU variant     : 0x0\n"
+          "CPU part        : 0x06f\n"
+          "CPU revision    : 2\n"
+          "\n"
+          "Hardware        : QCT APQ8064 MAKO\n"
+          "Revision        : 000b\n"
+          "Serial          : 0000000000000000\n",
+          HWCAP_NEON,
+          0,
+          false,
+      },
+      // Razr M from https://crbug.com/341598#c43
+      {
+          "Processor       : ARMv7 Processor rev 4 (v7l)\n"
+          "processor       : 0\n"
+          "BogoMIPS        : 13.53\n"
+          "\n"
+          "Features        : swp half thumb fastmult vfp edsp neon vfpv3 tls "
+          "vfpv4\n"
+          "CPU implementer : 0x51\n"
+          "CPU architecture: 7\n"
+          "CPU variant     : 0x1\n"
+          "CPU part        : 0x04d\n"
+          "CPU revision    : 4\n"
+          "\n"
+          "Hardware        : msm8960dt\n"
+          "Revision        : 82a0\n"
+          "Serial          : 0001000201fe37a5\n",
+          HWCAP_NEON,
+          0,
+          false,
+      },
+      // Pixel 2 (truncated slightly)
+      {
+          "Processor       : AArch64 Processor rev 1 (aarch64)\n"
+          "processor       : 0\n"
+          "BogoMIPS        : 38.00\n"
+          "Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32\n"
+          "CPU implementer : 0x51\n"
+          "CPU architecture: 8\n"
+          "CPU variant     : 0xa\n"
+          "CPU part        : 0x801\n"
+          "CPU revision    : 4\n"
+          "\n"
+          "processor       : 1\n"
+          "BogoMIPS        : 38.00\n"
+          "Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32\n"
+          "CPU implementer : 0x51\n"
+          "CPU architecture: 8\n"
+          "CPU variant     : 0xa\n"
+          "CPU part        : 0x801\n"
+          "CPU revision    : 4\n"
+          "\n"
+          "processor       : 2\n"
+          "BogoMIPS        : 38.00\n"
+          "Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32\n"
+          "CPU implementer : 0x51\n"
+          "CPU architecture: 8\n"
+          "CPU variant     : 0xa\n"
+          "CPU part        : 0x801\n"
+          "CPU revision    : 4\n"
+          "\n"
+          "processor       : 3\n"
+          "BogoMIPS        : 38.00\n"
+          "Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32\n"
+          "CPU implementer : 0x51\n"
+          "CPU architecture: 8\n"
+          "CPU variant     : 0xa\n"
+          "CPU part        : 0x801\n"
+          "CPU revision    : 4\n"
+          // (Extra processors omitted.)
+          "\n"
+          "Hardware        : Qualcomm Technologies, Inc MSM8998\n",
+          HWCAP_NEON,  // CPU architecture 8 implies NEON.
+          HWCAP2_AES | HWCAP2_PMULL | HWCAP2_SHA1 | HWCAP2_SHA2,
+          false,
+      },
+      // Nexus 4 from
+      // Garbage should be tolerated.
+      {
+          "Blah blah blah this is definitely an ARM CPU",
+          0,
+          0,
+          false,
+      },
+      // A hypothetical ARMv8 CPU without crc32 (and thus no trailing space
+      // after the last crypto entry).
+      {
+          "Features        : aes pmull sha1 sha2\n"
+          "CPU architecture: 8\n",
+          HWCAP_NEON,
+          HWCAP2_AES | HWCAP2_PMULL | HWCAP2_SHA1 | HWCAP2_SHA2,
+          false,
+      },
+      // Various combinations of ARMv8 flags.
+      {
+          "Features        : aes sha1 sha2\n"
+          "CPU architecture: 8\n",
+          HWCAP_NEON,
+          HWCAP2_AES | HWCAP2_SHA1 | HWCAP2_SHA2,
+          false,
+      },
+      {
+          "Features        : pmull sha2\n"
+          "CPU architecture: 8\n",
+          HWCAP_NEON,
+          HWCAP2_PMULL | HWCAP2_SHA2,
+          false,
+      },
+      {
+          "Features        : aes aes   aes not_aes aes aes \n"
+          "CPU architecture: 8\n",
+          HWCAP_NEON,
+          HWCAP2_AES,
+          false,
+      },
+      {
+          "Features        : \n"
+          "CPU architecture: 8\n",
+          HWCAP_NEON,
+          0,
+          false,
+      },
+      {
+          "Features        : nothing\n"
+          "CPU architecture: 8\n",
+          HWCAP_NEON,
+          0,
+          false,
+      },
+      // If opening /proc/cpuinfo fails, we process the empty string.
+      {
+          "",
+          0,
+          0,
+          false,
+      },
+  };
+
+  for (const auto &t : kTests) {
+    SCOPED_TRACE(t.cpuinfo);
+    STRING_PIECE sp = {t.cpuinfo, strlen(t.cpuinfo)};
+    EXPECT_EQ(t.hwcap, crypto_get_arm_hwcap_from_cpuinfo(&sp));
+    EXPECT_EQ(t.hwcap2, crypto_get_arm_hwcap2_from_cpuinfo(&sp));
+    EXPECT_EQ(t.broken_neon ? 1 : 0, crypto_cpuinfo_has_broken_neon(&sp));
+  }
+}