add an unit test for parsing the "/etc/os-release" of CentOS

 add a newline character at the end

Author: CuZn13

pkg/util/helpers_test.go

@@ -161,6 +161,12 @@ func TestGetOSVersion(t *testing.T) {
 			expectedOSVersion: "ubuntu 16.04.6 LTS (Xenial Xerus)",
 			expectErr:         false,
 		},
+		{
+			name:              "centos",
+			fakeOSReleasePath: "testdata/os-release-centos",
+			expectedOSVersion: "centos 7 (Core)",
+			expectErr:         false,
+		},
 		{
 			name:              "Unknown",
 			fakeOSReleasePath: "testdata/os-release-unknown",

pkg/util/testdata/os-release-centos

@@ -0,0 +1,15 @@
+NAME="CentOS Linux"
+VERSION="7 (Core)"
+ID="centos"
+ID_LIKE="rhel fedora"
+VERSION_ID="7"
+PRETTY_NAME="CentOS Linux 7 (Core)"
+ANSI_COLOR="0;31"
+CPE_NAME="cpe:/o:centos:centos:7"
+HOME_URL="https://www.centos.org/"
+BUG_REPORT_URL="https://bugs.centos.org/"
+
+CENTOS_MANTISBT_PROJECT="CentOS-7"
+CENTOS_MANTISBT_PROJECT_VERSION="7"
+REDHAT_SUPPORT_PRODUCT="centos"
+REDHAT_SUPPORT_PRODUCT_VERSION="7"