[#206] Make bats tests space-sensitive

Problem: Right now, our bats tests ignore empty lines and
leading/trailing whitespace differences between the expected output and
the actual output.

However, this could lead to accidental bugs in xrefcheck's output.

Trailing whitespace isn't very concerning (except when it's excessive
and it causes the terminal to line-wrap), but additional/missing empty
lines and leading whitespace can lead to significant changes.

Solution: Let's make these tests sensitive to empty lines and leading
whitespace.

tests/golden/check-cli/check-cli.bats

@@ -33,7 +33,7 @@ load '../helpers'
   assert_output --partial "All repository links are valid."
 }
 
-@test "Reduchant slashes in ignore" {
+@test "Redundant slashes in ignore" {
   run xrefcheck \
     --ignore ./././././././//to-ignore/* \
     --root .
@@ -45,6 +45,8 @@ load '../helpers'
   to_temp xrefcheck --root .
 
   assert_diff - <<EOF
+
+
 === Invalid references found ===
 
   ➥  In file to-ignore/broken-link.md
@@ -65,6 +67,8 @@ EOF
   to_temp xrefcheck --root ././///././././//./
 
   assert_diff - <<EOF
+
+
 === Invalid references found ===
 
   ➥  In file to-ignore/broken-link.md
@@ -85,6 +89,8 @@ EOF
   to_temp xrefcheck
 
   assert_diff - <<EOF
+
+
 === Invalid references found ===
 
   ➥  In file to-ignore/broken-link.md

tests/golden/check-footnotes/expected.gold

@@ -1,3 +1,5 @@
+
+
 === Invalid references found ===
 
   ➥  In file broken-link-in-footnote/file-with-footnote-with-broken-link.md

tests/golden/check-git/check-git.bats

@@ -41,16 +41,18 @@ load '../helpers'
   to_temp xrefcheck
 
   assert_diff - <<EOF
+
+
 === Invalid references found ===
 
   ➥  In file git.md
-      bad reference (relative) at src:1:1-11:
-        - text: "a"
-        - link: ./a.md
-        - anchor: -
+     bad reference (relative) at src:1:1-11:
+       - text: "a"
+       - link: ./a.md
+       - anchor: -
 
-      ⛀  File does not exist:
-          a.md
+     ⛀  File does not exist:
+        a.md
 
 
 Invalid references dumped, 1 in total.

tests/golden/check-ignore/check-ignore.bats

@@ -41,10 +41,9 @@ load '../helpers'
 === Scan errors found ===
 
   ➥  In file to-ignore/inner-directory/broken_annotation.md
-  scan error at src:9:1-29:
-
-  ⛀  Annotation "ignore all" must be at the top of markdown or right after comments at the top
+     scan error at src:9:1-29:
 
+     ⛀  Annotation "ignore all" must be at the top of markdown or right after comments at the top
 
 
 Scan errors dumped, 1 in total.

tests/golden/check-ignore/expected.gold

@@ -1,3 +1,5 @@
+
+
 === Scan errors found ===
 
   ➥  In file ./to-ignore/inner-directory/broken_annotation.md

tests/golden/check-ignoreExternalRefsTo/expected.gold

@@ -1,3 +1,5 @@
+
+
 === Invalid references found ===
 
   ➥  In file check-ignoreExternalRefsTo.md

tests/golden/check-ignoreLocalRefsTo/expected.gold

@@ -1,3 +1,5 @@
+
+
 === Invalid references found ===
 
   ➥  In file check-ignoreLocalRefsTo.md

tests/golden/check-ignoreRefsFrom/check-ignoreRefsFrom.bats

@@ -32,6 +32,8 @@ load '../helpers'
   to_temp xrefcheck -c config-directory.yaml
 
   assert_diff - <<EOF
+
+
 === Invalid references found ===
 
   ➥  In file ignoreRefsFrom/inner-directory/bad-reference.md

tests/golden/check-local-refs/expected1.gold

@@ -1,3 +1,5 @@
+
+
 === Invalid references found ===
 
   ➥  In file dir1/dir2/d2f1.md

tests/golden/check-local-refs/expected2.gold

@@ -1,3 +1,5 @@
+
+
 === Invalid references found ===
 
   ➥  In file dir1/dir2/d2f1.md

tests/golden/check-local-refs/expected3.gold

@@ -1,3 +1,5 @@
+
+
 === Invalid references found ===
 
   ➥  In file dir1/dir2/d2f1.md

tests/golden/check-scan-errors/expected.gold

@@ -1,6 +1,5 @@
 === Scan errors found ===
 
-
   ➥  In file check-scan-errors.md
      scan error at src:9:1-29:
 

tests/golden/helpers.bash

@@ -67,9 +67,6 @@ assert_diff() {
   : "{output_file?}"
 
   diff $output_file $1 \
-    --ignore-space-change \
     --ignore-tab-expansion \
-    --ignore-trailing-space \
-    --ignore-blank-lines \
-    --new-file # treat absent files as empty
+    --ignore-trailing-space
 }