diff --git a/src/testdir/test_termdebug.vim b/src/testdir/test_termdebug.vim
new file mode 100644
index 0000000..16d0004
--- /dev/null
+++ b/src/testdir/test_termdebug.vim
@@ -0,0 +1,91 @@
+" Test for the termdebug plugin
+
+source check.vim
+
+CheckUnix
+CheckFeature terminal
+CheckExecutable gdb
+CheckExecutable gcc
+
+let g:GDB = exepath('gdb')
+if g:GDB->empty()
+  throw 'Skpped: gdb is not found in $PATH'
+endif
+
+let g:GCC = exepath('gcc')
+if g:GCC->empty()
+  throw 'Skpped: gcc is not found in $PATH'
+endif
+
+packadd termdebug
+
+func Test_termdebug_basic()
+  let lines =<< trim END
+    #include <stdio.h>
+    #include <stdlib.h>
+
+    int isprime(int n)
+    {
+      if (n <= 1)
+        return 0;
+
+      for (int i = 2; i <= n / 2; i++)
+        if (n % i == 0)
+          return 0;
+
+      return 1;
+    }
+
+    int main(int argc, char *argv[])
+    {
+      int n = 7;
+
+      printf("%d is %s prime\n", n, isprime(n) ? "a" : "not a");
+
+      return 0;
+    }
+  END
+  call writefile(lines, 'XTD_basic.c', 'D')
+  call system($'{g:GCC} -g -o XTD_basic XTD_basic.c')
+
+  edit XTD_basic.c
+  Termdebug ./XTD_basic
+  call assert_equal(3, winnr('$'))
+  let gdb_buf = winbufnr(1)
+  wincmd b
+  Break 9
+  call term_wait(gdb_buf)
+  redraw!
+  call assert_equal([
+        \ {'lnum': 9, 'id': 1014, 'name': 'debugBreakpoint1.0',
+        \  'priority': 110, 'group': 'TermDebug'}],
+        \ sign_getplaced('', #{group: 'TermDebug'})[0].signs)
+  Run
+  call term_wait(gdb_buf, 200)
+  redraw!
+  call assert_equal([
+        \ {'lnum': 9, 'id': 12, 'name': 'debugPC', 'priority': 110,
+        \  'group': 'TermDebug'},
+        \ {'lnum': 9, 'id': 1014, 'name': 'debugBreakpoint1.0',
+        \  'priority': 110, 'group': 'TermDebug'}],
+        \ sign_getplaced('', #{group: 'TermDebug'})[0].signs)
+  Finish
+  call term_wait(gdb_buf)
+  redraw!
+  call assert_equal([
+        \ {'lnum': 9, 'id': 1014, 'name': 'debugBreakpoint1.0',
+        \  'priority': 110, 'group': 'TermDebug'},
+        \ {'lnum': 20, 'id': 12, 'name': 'debugPC',
+        \  'priority': 110, 'group': 'TermDebug'}],
+        \ sign_getplaced('', #{group: 'TermDebug'})[0].signs)
+  Continue
+  wincmd t
+  quit!
+  redraw!
+  call assert_equal([], sign_getplaced('', #{group: 'TermDebug'})[0].signs)
+
+  call delete('XTD_basic')
+  %bw!
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab