buildman: dtoc: Suppress unwanted output from test

There are a few test cases which print output. Suppress this so that tests
can run silently in the normal case.
Signed-off-by: NSimon Glass <sjg@chromium.org>

tools/buildman/test.py

@@ -20,6 +20,7 @@ import control
 import command
 import commit
 import terminal
+import test_util
 import toolchain
 
 use_network = True
@@ -422,7 +423,8 @@ class TestBuild(unittest.TestCase):
     def testToolchainDownload(self):
         """Test that we can download toolchains"""
         if use_network:
-            url = self.toolchains.LocateArchUrl('arm')
+            with test_util.capture_sys_output() as (stdout, stderr):
+                url = self.toolchains.LocateArchUrl('arm')
             self.assertRegexpMatches(url, 'https://www.kernel.org/pub/tools/'
                     'crosstool/files/bin/x86_64/.*/'
                     'x86_64-gcc-.*-nolibc_arm-.*linux-gnueabi.tar.xz')

tools/dtoc/test_dtoc.py

@@ -385,7 +385,8 @@ U_BOOT_DEVICE(phandle_source2) = {
 
     def test_phandle_bad(self):
         """Test a node containing an invalid phandle fails"""
-        dtb_file = get_dtb_file('dtoc_test_phandle_bad.dts')
+        dtb_file = get_dtb_file('dtoc_test_phandle_bad.dts',
+                                capture_stderr=True)
         output = tools.GetOutputFilename('output')
         with self.assertRaises(ValueError) as e:
             dtb_platdata.run_steps(['struct'], dtb_file, False, output)
@@ -394,7 +395,8 @@ U_BOOT_DEVICE(phandle_source2) = {
 
     def test_phandle_bad2(self):
         """Test a phandle target missing its #*-cells property"""
-        dtb_file = get_dtb_file('dtoc_test_phandle_bad2.dts')
+        dtb_file = get_dtb_file('dtoc_test_phandle_bad2.dts',
+                                capture_stderr=True)
         output = tools.GetOutputFilename('output')
         with self.assertRaises(ValueError) as e:
             dtb_platdata.run_steps(['struct'], dtb_file, False, output)