Minor fixes, ensuring tests pass on FreeBSD

- do not test 'ansi' hpa/vpa: On FreeBSD, ansi has no
  such capability.  This is the reason such "proxies"
  exist, anyway.
- workaround for freebsd, which actually has an 'unknown'
  termcap entry
- 'ansi' on freebsd tests '0' for number of colors, use
  cons25 on such system.
- freebsd: handle ValueError in signal.getsignal in
  the accessory script ``tools/display-signalhandlers.py``,
  we don't actually **need** this script, it is just chained
  as part of the build to help in debugging issues with any
  given build agent, and any gven OS problem reports.

4 files changed, 27 insertions, 12 deletions

diff --git a/blessings/_binterms.py b/blessings/_binterms.py
index 6c93ee0..504bc9c 100644
--- a/blessings/_binterms.py
+++ b/blessings/_binterms.py
@@ -707,7 +707,6 @@ tvi950-rv
 tvi950-rv-2p
 tvi950-rv-4p
 tvipt
-unknown
 vanilla
 vc303
 vc404
diff --git a/blessings/tests/test_core.py b/blessings/tests/test_core.py
index ce1e838..cea2eaf 100644
--- a/blessings/tests/test_core.py
+++ b/blessings/tests/test_core.py
@@ -107,7 +107,12 @@ def test_number_of_colors_without_tty():
 
     @as_subprocess
     def child_8_forcestyle():
-        t = TestTerminal(kind='ansi', stream=StringIO(),
+        kind = 'ansi'
+        if platform.system().lower() == 'freebsd':
+            # 'ansi' on freebsd returns 0 colors, we use the 'cons25' driver,
+            # compatible with its kernel tty.c
+            kind = 'cons25'
+        t = TestTerminal(kind=kind, stream=StringIO(),
                          force_styling=True)
         assert (t.number_of_colors == 8)
 
@@ -132,7 +137,12 @@ def test_number_of_colors_with_tty():
 
     @as_subprocess
     def child_8():
-        t = TestTerminal(kind='ansi')
+        kind = 'ansi'
+        if platform.system().lower() == 'freebsd':
+            # 'ansi' on freebsd returns 0 colors, we use the 'cons25' driver,
+            # compatible with its kernel tty.c
+            kind = 'cons25'
+        t = TestTerminal(kind=kind)
         assert (t.number_of_colors == 8)
 
     @as_subprocess
@@ -201,9 +211,10 @@ def test_setupterm_singleton_issue33():
 def test_setupterm_invalid_issue39():
     "A warning is emitted if TERM is invalid."
     # https://bugzilla.mozilla.org/show_bug.cgi?id=878089
-
+    #
     # if TERM is unset, defaults to 'unknown', which should
-    # fail to lookup and emit a warning, only.
+    # fail to lookup and emit a warning on *some* systems.
+    # freebsd actually has a termcap entry for 'unknown'
     @as_subprocess
     def child():
         warnings.filterwarnings("error", category=UserWarning)
@@ -216,8 +227,9 @@ def test_setupterm_invalid_issue39():
                 "Failed to setupterm(kind='unknown'): "
                 "setupterm: could not find terminal")
         else:
-            assert not term.is_a_tty and not term.does_styling, (
-                'Should have thrown exception')
+            if platform.system().lower() != 'freebsd':
+                assert not term.is_a_tty and not term.does_styling, (
+                    'Should have thrown exception')
         warnings.resetwarnings()
 
     child()
@@ -233,7 +245,7 @@ def test_setupterm_invalid_has_no_styling():
     def child():
         warnings.filterwarnings("ignore", category=UserWarning)
 
-        term = TestTerminal(kind='unknown', force_styling=True)
+        term = TestTerminal(kind='xxXunknownXxx', force_styling=True)
         assert term.kind is None
         assert term.does_styling is False
         assert term.number_of_colors == 0
diff --git a/blessings/tests/test_sequences.py b/blessings/tests/test_sequences.py
index f42a52c..c0cafce 100644
--- a/blessings/tests/test_sequences.py
+++ b/blessings/tests/test_sequences.py
@@ -192,8 +192,8 @@ def test_horizontal_location(all_terms):
         assert (t.stream.getvalue() == expected_output), (
             repr(t.stream.getvalue()), repr(expected_output))
 
-    # skip 'screen', hpa is proxied (see later tests)
-    if all_terms != 'screen':
+    # skip 'screen', 'ansi': hpa is proxied (see later tests)
+    if all_terms not in ('screen', 'ansi'):
         child(all_terms)
 
 
@@ -211,7 +211,7 @@ def test_vertical_location(all_terms):
         assert (t.stream.getvalue() == expected_output)
 
     # skip 'screen', vpa is proxied (see later tests)
-    if all_terms != 'screen':
+    if all_terms not in ('screen', 'ansi'):
         child(all_terms)
 
 
diff --git a/tools/display-sighandlers.py b/tools/display-sighandlers.py
index 98445e9..f3559f7 100755
--- a/tools/display-sighandlers.py
+++ b/tools/display-sighandlers.py
@@ -12,7 +12,11 @@ for name, value in [(signal_name, getattr(signal, signal_name))
                     for signal_name in dir(signal)
                     if signal_name.startswith('SIG')
                     and not signal_name.startswith('SIG_')]:
-    handler = signal.getsignal(value)
+    try:
+        handler = signal.getsignal(value)
+    except ValueError:
+        # FreeBSD: signal number out of range
+        handler = 'out of range'
     description = {
         signal.SIG_IGN: "ignored(SIG_IGN)",
         signal.SIG_DFL: "default(SIG_DFL)"