tests: usb: Make tests for usb mass sample more robust

It was found that the existing regex check was not enough to validate
correctness of execution of mass samples. Tests would pass even when
a filesystem failed to be mounted. An additional line to check is added
to validate the setup of a filesystem.

Signed-off-by: Maciej Perkowski <Maciej.Perkowski@nordicsemi.no>

samples/subsys/usb/mass/sample.yaml

@@ -10,8 +10,10 @@ tests:
     tags: msd usb
     harness: console
     harness_config:
-      type: one_line
+      type: multi_line
+      ordered: True
       regex:
+        - "No file system selected"
         - "The device is put in USB mass storage mode."
   sample.usb.mass_ram_fat:
     min_ram: 128
@@ -23,8 +25,10 @@ tests:
     tags: msd usb
     harness: console
     harness_config:
-      type: one_line
+      type: multi_line
+      ordered: True
       regex:
+        - "End of files"
         - "The device is put in USB mass storage mode."
   sample.usb.mass_flash_fatfs:
     min_ram: 32
@@ -39,8 +43,10 @@ tests:
     tags: msd usb
     harness: console
     harness_config:
-      type: one_line
+      type: multi_line
+      ordered: True
       regex:
+        - "End of files"
         - "The device is put in USB mass storage mode."
   sample.usb.mass_sdhc_fatfs:
     min_ram: 32
@@ -53,9 +59,11 @@ tests:
     tags: msd usb
     harness: console
     harness_config:
-      type: one_line
       fixture: fixture_sdcard
+      type: multi_line
+      ordered: True
       regex:
+        - "End of files"
         - "The device is put in USB mass storage mode."
   sample.usb.mass_flash_littlefs:
     modules:
@@ -70,6 +78,8 @@ tests:
     tags: msd usb
     harness: console
     harness_config:
-      type: one_line
+      type: multi_line
+      ordered: True
       regex:
+        - "End of files"
         - "The device is put in USB mass storage mode."