Meta: Add unit test for _forgit_get_files_from_diff_line function (#464)

Update CI to install latest bashunit beta version instead of fixed
0.23.0 version because we need the new "data_set" function for
parameterized tests.

.github/workflows/ci.yaml

@@ -39,7 +39,7 @@ jobs:
           sudo apt -y update
           sudo apt -y install zsh fish shellcheck
         fi
-        curl -s https://bashunit.typeddevs.com/install.sh | bash -s 0.23.0
+        curl -s https://bashunit.typeddevs.com/install.sh | bash -s beta
 
     - name: Show version
       run: |

tests/helper-functions.test.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+function set_up_before_script() {
+    source bin/git-forgit
+}
+
+# @data_provider provider_diff_lines
+function test_forgit_get_files_from_diff_line() {
+    local -r input="$1"
+    shift
+    local -r expected=("$@")
+    local -a actual=()
+    local i
+
+    while IFS= read -r line; do
+        actual+=( "$line" )
+    done < <( echo -n "$input" | _forgit_get_files_from_diff_line | xargs -0 -n 1 echo )
+
+    # Compare array sizes
+    assert_same "${#expected[@]}" "${#actual[@]}"
+
+    # Compare array elements
+    for i in "${!expected[@]}"; do
+        assert_same "${expected[i]}" "${actual[i]}"
+    done
+}
+
+function provider_diff_lines() {
+    data_set "[A]     newfile" "newfile"
+    data_set "[D]     oldfile with spaces" "oldfile with spaces"
+    data_set "[R100]  file  ->  another file" "file" "another file"
+    data_set "[M]     \"file with\ttab.txt\"" "\"file with\ttab.txt\""
+}