change algorithm, fix edge cases, add tests

4 files changed, 68 insertions, 0 deletions

diff --git a/test/a/x b/test/a/x
new file mode 100755
index 0000000..e7d6387
--- /dev/null
+++ b/test/a/x
@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "in a with $0, next"
+nextbin "$0" "$@"
diff --git a/test/b/x b/test/b/x
new file mode 100755
index 0000000..0355509
--- /dev/null
+++ b/test/b/x
@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "in b with $0, next"
+nextbin "$0" "$@"
diff --git a/test/c/x b/test/c/x
new file mode 100755
index 0000000..cc0070b
--- /dev/null
+++ b/test/c/x
@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "in c with $0, done"
+exit 0
diff --git a/test/start b/test/start
new file mode 100755
index 0000000..4cf0d9d
--- /dev/null
+++ b/test/start
@@ -0,0 +1,59 @@
+#!/bin/sh
+
+set -e
+
+cd "${0%/*}"
+exec 2>&1
+
+check() {
+    for arg in $1; do
+        read -r line || { echo "FAIL: insufficient output" >&2; return 1; }
+        echo "GOT: $line"
+        case "$arg" in
+            [a-z]) case "$line" in "in $arg "*) ;; *) echo "FAIL: expected $arg" >&2; return 1; esac;;
+            err) case "$line" in nextbin*failed*) ;; *) echo "FAIL: expected err" >&2; return 1; esac;;
+            *) echo "INVALID TEST" >&2; exit 1
+        esac
+    done
+    if read -r line; then
+        echo "FAIL: too much output" >&2
+        return 1
+    fi
+    echo "OK"
+}
+
+try() {
+    # shellcheck disable=SC2016
+    printf 'TEST: PATH="$PATH:%s" %s, expect %s\n' "$@"
+    PATH="$PATH:$1" "$2" 2>&1 | check "$3"
+    # shellcheck disable=SC2016
+    printf 'TEST: PATH="%s:$PATH" %s, expect %s\n' "$@"
+    PATH="$1:$PATH" "$2" 2>&1 | check "$3"
+}
+
+do_try() {
+    try "$1" "$2/x" "$3"
+    try "$1" "./$2/x" "$3"
+    try "$1" "$PWD/$2/x" "$3"
+    try "$1" "$2/../$2/x" "$3"
+    try "$1" "./$2/../$2/x" "$3"
+    try "$1" "$PWD/$2/../$2/x" "$3"
+    echo
+}
+
+do_try2() {
+    try "$1" "x" "$3"
+    do_try "$@"
+}
+
+export PATH="$PWD/..:$PATH"
+
+do_try "" a "a err"
+do_try2 "$PWD/a" a "a err"
+do_try "$PWD/b" a "a b err"
+do_try2 "$PWD/a:$PWD/b" a "a b err"
+do_try "$PWD/a:$PWD/b" b "b err"
+do_try2 "$PWD/a:$PWD/b:$PWD/c" a "a b c"
+do_try "$PWD/a:$PWD/b:$PWD/c" b "b c"
+
+echo "ALL TESTS COMPLETED SUCCESSFULLY :)"