From e07f2a8b2ad979bd21cc076c0b6a206537469d6b Mon Sep 17 00:00:00 2001
From: Alex Fikl <alexfikl@gmail.com>
Date: Wed, 6 Jun 2018 19:18:43 -0500
Subject: [PATCH] tests: skip tests if maxima not available

---
 pymbolic/interop/maxima.py | 32 ++++++++++++++++++++++++++++++++
 test/test_maxima.py        | 10 ++++++++++
 2 files changed, 42 insertions(+)

diff --git a/pymbolic/interop/maxima.py b/pymbolic/interop/maxima.py
index 4be1dcf..380ffa9 100644
--- a/pymbolic/interop/maxima.py
+++ b/pymbolic/interop/maxima.py
@@ -45,6 +45,38 @@ import numpy as np
 from pymbolic.mapper.stringifier import StringifyMapper
 from pymbolic.parser import Parser as ParserBase, FinalizedTuple
 
+# {{{ check for maxima executable
+
+
+def _find_maxima_executable():
+    import os
+
+    def is_executable(filename):
+        return os.path.isfile(filename) and os.access(filename, os.X_OK)
+
+    global FOUND_MAXIMA
+
+    executable = os.environ.get("SUMPY_MAXIMA_EXECUTABLE", "maxima")
+
+    FOUND_MAXIMA = False
+    if is_executable(executable):
+        FOUND_MAXIMA = True
+    else:
+        executable = os.path.basename(executable)
+        try:
+            import shutil
+            FOUND_MAXIMA = bool(shutil.which(executable))
+        except ImportError:
+            for path in os.environ["PATH"].split(os.pathsep):
+                filename = os.path.join(path, executable)
+                if is_executable(filename):
+                    FOUND_MAXIMA = True
+                    break
+
+
+_find_maxima_executable()
+
+# }}}
 
 IN_PROMPT_RE = re.compile(br"\(%i([0-9]+)\) ")
 OUT_PROMPT_RE = re.compile(br"\(%o([0-9]+)\) ")
diff --git a/test/test_maxima.py b/test/test_maxima.py
index a61f0f2..7a6a7e0 100644
--- a/test/test_maxima.py
+++ b/test/test_maxima.py
@@ -24,8 +24,10 @@ THE SOFTWARE.
 
 import pytest
 from pymbolic.interop.maxima import MaximaKernel
+from pymbolic.interop.maxima import FOUND_MAXIMA
 
 
+@pytest.mark.skipif(not FOUND_MAXIMA, reason="cannot find maxima executable")
 def test_kernel():
     pytest.importorskip("pexpect")
 
@@ -45,6 +47,7 @@ def knl(request):
     return knl
 
 
+@pytest.mark.skipif(not FOUND_MAXIMA, reason="cannot find maxima executable")
 def test_setup(knl):
     pytest.importorskip("pexpect")
 
@@ -53,6 +56,7 @@ def test_setup(knl):
             "sum(diff(k, t,deg)*t^deg,deg,0,6)")
 
 
+@pytest.mark.skipif(not FOUND_MAXIMA, reason="cannot find maxima executable")
 def test_error(knl):
     from pymbolic.interop.maxima import MaximaError
     try:
@@ -66,6 +70,7 @@ def test_error(knl):
         pass
 
 
+@pytest.mark.skipif(not FOUND_MAXIMA, reason="cannot find maxima executable")
 def test_strict_round_trip(knl):
     from pymbolic import parse
     from pymbolic.primitives import Quotient
@@ -90,6 +95,7 @@ def test_strict_round_trip(knl):
         assert round_trips_correctly
 
 
+@pytest.mark.skipif(not FOUND_MAXIMA, reason="cannot find maxima executable")
 def test_lax_round_trip(knl):
     from pymbolic.interop.maxima import MaximaParser
     k_setup = [
@@ -104,6 +110,7 @@ def test_lax_round_trip(knl):
             "ratsimp(result-result2)") == 0
 
 
+@pytest.mark.skipif(not FOUND_MAXIMA, reason="cannot find maxima executable")
 def test_parse_matrix(knl):
     z = knl.clean_eval_str_with_setup([
         "A:matrix([1,2+0.3*dt], [3,4])",
@@ -115,6 +122,7 @@ def test_parse_matrix(knl):
     print(MaximaParser()(z))
 
 
+@pytest.mark.skipif(not FOUND_MAXIMA, reason="cannot find maxima executable")
 def test_diff():
     pytest.importorskip("pexpect")
 
@@ -123,12 +131,14 @@ def test_diff():
     diff(parse("sqrt(x**2+y**2)"), parse("x"))
 
 
+@pytest.mark.skipif(not FOUND_MAXIMA, reason="cannot find maxima executable")
 def test_long_command(knl):
     from pymbolic.interop.maxima import set_debug
     set_debug(4)
     knl.eval_str("+".join(["1"]*16384))
 
 
+@pytest.mark.skipif(not FOUND_MAXIMA, reason="cannot find maxima executable")
 def test_restart(knl):
     pytest.importorskip("pexpect")
 
-- 
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