unit tests: add tests for get_mntpoint_from_target

get_mntpoint_from_target was rewritten to handle bind mounts. findmnt
uses square brackets to denote the fsroot, but square brackets are
also used for normal purposes, such as ipv6 addresses, and dirnames
can contain square brackets, too.

Suggested-by: Coiby Xu <[email protected]>
Signed-off-by: Lichen Liu <[email protected]>

spec/kdump-lib-initramfs_spec.sh

@@ -38,4 +38,54 @@ Describe 'kdump-lib-initramfs'
 
 	End
 
+	Describe 'Test get_mntpoint_from_target'
+		findmnt() {
+			if [[ "$7" == 'eng.redhat.com:/srv/[nfs]' ]]; then
+				if [[ "$8" == "-f" ]]; then
+					printf '/mnt\n'
+				else
+					printf '/mnt %s\n' "$7"
+				fi
+			elif [[ "$7" == '[2620:52:0:a1:217:38ff:fe01:131]:/srv/[nfs]' ]]; then
+				if [[ "$8" == "-f" ]]; then
+					printf '/mnt\n'
+				else
+					printf '/mnt %s\n' "$7"
+				fi
+			elif [[ "$7" == '/dev/mapper/rhel[disk]' ]]; then
+				if [[ "$8" == "-f" ]]; then
+					printf '/\n'
+				else
+					printf '/ %s\n' "$7"
+				fi
+			elif [[ "$7" == '/dev/vda4' ]]; then
+				if [[ "$8" == "-f" ]]; then
+					printf '/var\n'
+				else
+					printf '/var %s[/ostree/deploy/default/var]\n/sysroot %s\n' "$7" "$7"
+				fi
+			fi
+		}
+
+		Context 'Given different cases'
+			# Test the following cases:
+			#  - IPv6 NFS target
+			#  - IPv6 NFS target also contain '[' in the export
+			#  - local dumping target that has '[' in the name
+			#  - has bind mint
+			Parameters
+				'eng.redhat.com:/srv/[nfs]' '/mnt'
+				'[2620:52:0:a1:217:38ff:fe01:131]:/srv/[nfs]' '/mnt'
+				'/dev/mapper/rhel[disk]' '/'
+				'/dev/vda4' '/sysroot'
+			End
+
+			It 'should handle all cases correctly'
+				When call get_mntpoint_from_target "$1"
+				The output should equal "$2"
+			End
+		End
+
+	End
+
 End