tests: remove trailing whitespaces from .expected files

tests/errors/compiler/invalid_escape_seq.expected

@@ -1,3 +1,4 @@
+In file ./compiler/invalid_escape_seq.ark
 At \ @ 1:9
     1 | (print "\0")
       |         ^

tests/errors/index/at_out_of_range.expected

@@ -1 +1 @@
-IndexError: -2 out of range \[1\] (length 1)
+IndexError: -2 out of range [1] (length 1)

tests/errors/macros/argcount_unknown_arg.expected

@@ -1,8 +1,9 @@
+In file ./macros/argcount_unknown_arg.ark
 At test_func1!2 @ 13:41
    10 |
    11 | (let test_func (fun (a b c) (* a b c)))
    12 | (let test_func1 (partial test_func 1))
    13 | (let test_func1_2 (partial test_func1!2))
       | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    14 |
-        When expanding `argcount', expected a known function name, got unbound variable test_func1!2%
+        When expanding `argcount', expected a known function name, got unbound variable test_func1!2

tests/errors/run-tests

@@ -13,31 +13,32 @@ else
 fi
 
 Reset='\033[0m'
-Black='\033[0;30m'
 Red='\033[0;31m'
 Green='\033[0;32m'
 Yellow='\033[0;33m'
-Blue='\033[0;34m'
 Purple='\033[0;35m'
 Cyan='\033[0;36m'
-White='\033[0;37m'
 
 passed=0
 failed=0
 
 for f in ./**/*.ark; do
-    output=$($ark $f --lib ../../lib 2>&1)
-    expected=$(cat ${f%.*}.expected)
+    output=$($ark "$f" --lib ../../lib 2>&1)
+    expected=$(cat "${f%.*}.expected")
 
-    if [[ $(echo $output | grep "$expected") == "" ]]; then
+    case "$output" in
+      *"$expected"* )
+        echo -e "${Green}PASSED${Reset} ${f%.*}"
+        ((passed=passed+1))
+        ;;
+
+      *)
         echo -e "${Red}FAILED${Reset} ${f%.*}"
         ((failed=failed+1))
         echo -e "    ${Yellow}Output${Reset}:"
-        echo $output
-    else
-        echo -e "${Green}PASSED${Reset} ${f%.*}"
-        ((passed=passed+1))
-    fi
+        diff -a -y <(echo -e "$output") <(echo -e "$expected")
+        ;;
+    esac
 done
 
 echo "  ------------------------------"

tests/unittests/resources/ParserSuite/failure/incomplete_if.expected

@@ -1,6 +1,6 @@
 In file tests/unittests/resources/ParserSuite/failure/incomplete_if.ark
 At EOF @ 2:0
     1 | (if 1 2 3
-    2 | 
+    2 |
       | ^
         Missing ')' after condition

tests/unittests/resources/ParserSuite/failure/invalid.expected

@@ -2,5 +2,5 @@ In file tests/unittests/resources/ParserSuite/failure/invalid.ark
 At ) @ 1:10
     1 | (print 1))
       |          ^
-    2 | 
+    2 |
         invalid syntax, expected node