[lldb][NFC] Add basic IOHandler completion test

We have no test coverage for the IOHandler code that is doing the
completion in the command line. This is adding a pexpect-based test
as a preparation for the switch to using CompletionRequest in the
whole completion machinery.

llvm-svn: 368679

lldb/packages/Python/lldbsuite/test/iohandler/completion/TestIOHandlerCompletion.py

@@ -0,0 +1,58 @@
+"""
+Test completion in our IOHandlers.
+"""
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+
+class IOHandlerCompletionTest(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+    NO_DEBUG_INFO_TESTCASE = True
+
+    def setUp(self):
+        TestBase.setUp(self)
+
+    def expect_string(self, string):
+        import pexpect
+        """This expects for "string", with timeout & EOF being test fails."""
+        try:
+            self.child.expect_exact(string)
+        except pexpect.EOF:
+            self.fail("Got EOF waiting for '%s'" % (string))
+        except pexpect.TIMEOUT:
+            self.fail("Timed out waiting for '%s'" % (string))
+
+    @expectedFailureAll(
+        oslist=["windows"],
+        bugnumber="llvm.org/pr22274: need a pexpect replacement for windows")
+    def test_completion(self):
+        self.setTearDownCleanup()
+
+        import pexpect
+        exe = self.getBuildArtifact("a.out")
+        prompt = "(lldb) "
+
+        self.child = pexpect.spawn(
+            '%s %s %s %s' %
+            (lldbtest_config.lldbExec, self.lldbOption, "", exe))
+
+        self.expect_string(prompt)
+        self.child.send("\t\t\t")
+        self.expect_string("register")
+
+        self.child.send("regi\t")
+        self.expect_string(prompt + "register")
+        self.child.send("\n")
+
+        self.child.send("\t")
+        self.expect_string("More (Y/n/a)")
+        self.child.send("n")
+        self.expect_string(prompt)
+
+        # Shouldn't crash or anything like that.
+        self.child.send("regoinvalid\t")
+        self.expect_string(prompt)
+
+        self.deletePexpectChild()

lldb/packages/Python/lldbsuite/test/iohandler/completion/main.c

@@ -0,0 +1,5 @@
+int main(int argc, char **argv) {
+  lldb_enable_attach();
+  int to_complete = 0;
+  return to_complete;
+}