selftest/recipetool: Improve test failure output

When the test fails, it simply says the file doesn't exist. This isn't helpful
so improve the output.

(From OE-Core rev: ea6b42485696c6981157a28da2dc9a67f2f3f9c6)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/recipetool.py

@@ -456,8 +456,9 @@ class RecipetoolCreateTests(RecipetoolBase):
         os.makedirs(temprecipe)
         recipefile = os.path.join(temprecipe, 'meson_git.bb')
         srcuri = 'https://github.com/mesonbuild/meson;rev=1.3.1'
-        result = runCmd(['recipetool', 'create', '-o', temprecipe, srcuri])
-        self.assertTrue(os.path.isfile(recipefile))
+        cmd = ['recipetool', 'create', '-o', temprecipe, srcuri]
+        result = runCmd(cmd)
+        self.assertTrue(os.path.isfile(recipefile), msg="recipe %s not created for command %s, output %s" % (recipefile, " ".join(cmd), result.output))
         checkvars = {}
         checkvars['LICENSE'] = set(['Apache-2.0', 'Proprietary', 'Unknown'])
         checkvars['SRC_URI'] = 'git://github.com/mesonbuild/meson;protocol=https;branch=1.3'