MAINT, TST: remove test-installed-numpy.py

* replace usage of test-installed-numpy.py
with runtests.py; they serve similar purposes
and the latter is more commonly used / maintained

.coveragerc

@@ -1,3 +1,4 @@
 [run]
 branch = True
 include = */numpy/*
+disable_warnings = include-ignored

tools/travis-test.sh

@@ -83,9 +83,9 @@ run_test()
   export PYTHONWARNINGS=default
   if [ -n "$RUN_FULL_TESTS" ]; then
     export PYTHONWARNINGS="ignore::DeprecationWarning:virtualenv"
-    $PYTHON ../tools/test-installed-numpy.py -v --durations 10 --mode=full $COVERAGE_FLAG
+    $PYTHON ../runtests.py -n -v --durations 10 --mode=full $COVERAGE_FLAG
   else
-    $PYTHON ../tools/test-installed-numpy.py -v --durations 10
+    $PYTHON ../runtests.py -n -v --durations 10
   fi
 
   if [ -n "$RUN_COVERAGE" ]; then

tox.ini

@@ -15,7 +15,7 @@
 # To run against a specific subset of Python versions, use:
 #   tox -e py37
 
-# Extra arguments will be passed to test-installed-numpy.py. To run
+# Extra arguments will be passed to runtests.py. To run
 # the full testsuite:
 #   tox full
 # To run with extra verbosity:
@@ -33,7 +33,7 @@ envlist =
 deps=
   pytest
 changedir={envdir}
-commands={envpython} {toxinidir}/tools/test-installed-numpy.py --mode=full {posargs:}
+commands={envpython} {toxinidir}/runtests.py --mode=full {posargs:}
 
 [testenv:py37-not-relaxed-strides]
 basepython=python3.7
@@ -43,4 +43,4 @@ env=NPY_RELAXED_STRIDES_CHECKING=0
 # if you want it:
 [testenv:debug]
 basepython=python-dbg
-commands=gdb --args {envpython} {toxinidir}/tools/test-installed-numpy.py --mode=full {posargs:}
+commands=gdb --args {envpython} {toxinidir}/runtests.py --mode=full {posargs:}