ci: arrange correct test environment (PYTHONUBUFFERED, LD_LIBRARY_PATH)

Author: sbinet

.travis.yml

@@ -28,10 +28,6 @@ before_install:
    # GOPY_TRAVIS_CI is set
    - export GOPY_TRAVIS_CI=1
    - export GOTRACEBACK=crash
-   # make python output (sys.stdout, sys.stderr) unbuffered
-   - export PYTHONUNBUFFERED=1
-   # ls needs to look into the current directory to load the _go.so library
-   - export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:.
    # pypy3 isn't packaged in ubuntu yet.
    - TEMPDIR=$(mktemp -d)
    - export PYPYVERSION=v7.1.1

main_test.go

@@ -46,6 +46,8 @@ var (
 		"_examples/unicode":   []string{"py3"}, // doesn't work for 2
 		"_examples/osfile":    []string{"py2", "py3"},
 	}
+
+	testEnvironment = os.Environ()
 )
 
 func TestGovet(t *testing.T) {
@@ -839,6 +841,7 @@ func testPkgBackend(t *testing.T, pyvm string, table pkg) {
 
 	fmt.Printf("running %s test.py\n", pyvm)
 	cmd := exec.Command(pyvm, "./test.py")
+	cmd.Env = testEnvironment
 	cmd.Dir = tstDir
 	cmd.Stdin = os.Stdin
 	buf, err := cmd.CombinedOutput()

main_unix_test.go

@@ -7,13 +7,19 @@
 package main
 
 import (
+	"fmt"
 	"log"
 	"os"
 	"os/exec"
 	"strings"
 )
 
 func init() {
+
+	// ld needs to look into the current directory to load the _go.so library
+	os.Setenv("LD_LIBRARY_PATH", fmt.Sprintf("%s:.", os.Getenv("LD_LIBRARY_PATH")))
+	testEnvironment = os.Environ()
+
 	var (
 		py2 = "python2"
 		py3 = "python3"