Add a test for 'b' (toggle breakpoint)

[llunak]

Removed use of curses python module, lldbexpect hardcodes TERM=vt100, so the escape sequence should be actually hardcoded too. The previous version didn't work e.g. in Linux console.

[clayborg]

lldb/test/API is for testing the public LLDB API functions that are exported as lldb::SB*. Not sure this belongs here. There was another patch that was moving things around as well where I commented with the same issue.

[clayborg]

Sounds like it is ok for tests to be here, looks good.

lldb/test/API/commands/gui/breakpoints/Makefile

+C_SOURCES := main.c
+include Makefile.rules

lldb/test/API/commands/gui/breakpoints/TestGuiBreakpoints.py

+"""
+Test the 'gui' shortcut 'b' (toggle breakpoint).
+"""
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test.lldbpexpect import PExpectTest
+from curses import *
+
+class TestGuiBasicDebugCommandTest(PExpectTest):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    # PExpect uses many timeouts internally and doesn't play well
+    # under ASAN on a loaded machine..
+    @skipIfAsan
+    @skipIfCursesSupportMissing
+    @skipIfRemote # "run" command will not work correctly for remote debug
+    def test_gui(self):
+        self.build()
+
+        self.launch(executable=self.getBuildArtifact("a.out"), dimensions=(100,500))
+        self.expect('br set -o true -f main.c -p "// First break here"', substrs=["Breakpoint 1", "address ="])
+        self.expect("run", substrs=["stop reason ="])
+
+        self.child.sendline("breakpoint list")
+        self.child.expect_exact("No breakpoints currently set.")
+
+        escape_key = chr(27).encode()
+        setupterm() # curses
+        down_key = tigetstr("kcud1")
+
+        # Start the GUI and close the welcome window.
+        self.child.sendline("gui")
+        self.child.send(escape_key)
+        self.child.expect_exact("Sources") # wait for gui
+
+        # Go to next line, set a breakpoint.
+        self.child.send(down_key)
+        self.child.send('b')
+        self.child.send(escape_key)
+        self.expect_prompt()
+        self.child.sendline("breakpoint list")
+        self.child.expect("2: file = '[^']*main.c', line = 3,.*")
+        self.child.sendline("gui")
+        self.child.expect_exact("Sources")
+
+        # Go two lines down ("gui" resets position), set a breakpoint.
+        self.child.send(down_key)
+        self.child.send(down_key)
+        self.child.send('b')
+        self.child.send(escape_key)
+        self.expect_prompt()
+        self.child.sendline("breakpoint list")
+        self.child.expect("2: file = '[^']*main.c', line = 3,")
+        self.child.expect("3: file = '[^']*main.c', line = 4,")
+        self.child.sendline("gui")
+        self.child.expect_exact("Sources")
+
+        # Toggle both the breakpoints (remove them).
+        self.child.send(down_key)
+        self.child.send('b')
+        self.child.send(down_key)
+        self.child.send('b')
+        self.child.send(escape_key)
+        self.expect_prompt()
+        self.child.sendline("breakpoint list")
+        self.child.expect_exact("No breakpoints currently set.")
+        self.child.sendline("gui")
+        self.child.expect_exact("Sources")
+
+        # Press escape to quit the gui
+        self.child.send(escape_key)
+
+        self.expect_prompt()
+        self.quit()

lldb/test/API/commands/gui/breakpoints/main.c

+int main(int argc, char **argv) {
+  int var1 = 1; // First break here
+  int var2 = 2;
+  int var3 = 3;
+  return var1 + var2 + var3;
+}