Initial version of testing + Nix flake

test/lib_test.sh

@@ -0,0 +1,69 @@
+#!/bin/sh
+# shellcheck shell=dash
+
+# Load code to be tested
+. ../lib
+
+oneTimeSetUp() {
+    printf "[INFO] Current shell is: %s\n" "$(cat /proc/$$/cmdline | tr '\0' '\n' | head -n1)"
+    printf "[INFO] Utility paths:\n"
+    for util in awk sed grep; do
+        printf "%8s: %s\n" "$util" "$(which "$util")"
+    done
+}
+
+setUp() {
+    TEST_TMPDIR="$(mktemp -d)"
+    touch "$TEST_TMPDIR/.apply_test_dir"
+}
+
+tearDown() {
+    if test -f "$TEST_TMPDIR/.apply_test_dir"; then
+        rm -rf "$TEST_TMPDIR"
+    fi
+}
+
+testSubstitute_Basic() {
+    echo "hello world" > "$TEST_TMPDIR/input.txt"
+    substitute \
+        "$TEST_TMPDIR/input.txt" \
+        "$TEST_TMPDIR/output.txt" \
+        "hello" "goodbye"
+
+    assertEquals "goodbye world" "$(cat "$TEST_TMPDIR/output.txt")"
+}
+
+testSubstitute_Multi() {
+    echo "hello hello hello" > "$TEST_TMPDIR/input.txt"
+    substitute \
+        "$TEST_TMPDIR/input.txt" \
+        "$TEST_TMPDIR/output.txt" \
+        "hello" "hi"
+
+    assertEquals "hi hi hi" "$(cat "$TEST_TMPDIR/output.txt")"
+}
+
+testSubstitute_Multiline() {
+    printf "hello\nworld\nhello\nworld\n" > "$TEST_TMPDIR/input.txt"
+
+    substitute \
+        "$TEST_TMPDIR/input.txt" \
+        "$TEST_TMPDIR/output.txt" \
+        "hello\nworld" "$(printf "greetings\nall")"
+
+    assertEquals \
+        "$(printf "greetings\nall\ngreetings\nall")" \
+        "$(cat "$TEST_TMPDIR/output.txt")"
+}
+
+testSubstituteInPlace() {
+    echo "hello hello hello" > "$TEST_TMPDIR/sub.txt"
+    substituteInPlace \
+        "$TEST_TMPDIR/sub.txt" \
+        "hello" "hi"
+
+    assertEquals "hi hi hi" "$(cat "$TEST_TMPDIR/sub.txt")"
+}
+
+# Load shUnit2
+. ./shunit2