Add test for gef-remote cmd (#712)

.github/workflows/run-tests.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Install python and toolchain
       run: |
         sudo apt-get update
-        sudo apt-get install -y gdb-multiarch python3-dev python3-pip python3-wheel python3-setuptools git cmake gcc g++ pkg-config libglib2.0-dev
+        sudo apt-get install -y gdb-multiarch python3-dev python3-pip python3-wheel python3-setuptools git cmake gcc g++ pkg-config libglib2.0-dev gdbserver
         sudo python3 -m pip install --upgrade pip
 
     - name: Get pip cache dir

tests/runtests.py

@@ -167,6 +167,26 @@ def test_cmd_got(self):
         self.assertNotIn("strcpy", res)
         return
 
+    def test_cmd_gef_remote(self):
+        def start_gdbserver(exe="/tmp/default.out", port=1234):
+            return subprocess.Popen(["gdbserver", ":{}".format(port), exe],
+                                    stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+        def stop_gdbserver(gdbserver):
+            """Stops the gdbserver and waits until it is terminated if it was
+            still running. Needed to make the used port available again."""
+            if gdbserver.poll() is None:
+                gdbserver.kill()
+                gdbserver.wait()
+            return
+
+        before = ["gef-remote :1234"]
+        gdbserver = start_gdbserver()
+        res = gdb_start_silent_cmd("vmmap", before=before)
+        self.assertNoException(res)
+        stop_gdbserver(gdbserver)
+        return
+
     def test_cmd_heap_arenas(self):
         cmd = "heap arenas"
         target = "/tmp/heap.out"