diff --git a/scripts/tests.sh b/scripts/tests.sh
new file mode 100755
index 0000000..d59651d
--- /dev/null
+++ b/scripts/tests.sh
@@ -0,0 +1,229 @@
+#!/usr/bin/env sh
+
+# Parts of a shell library {{{
+die() {
+    error "$1";
+    if [ -n "$2" ]; then
+        exit "$2";
+    else
+        exit 1;
+    fi
+}
+
+print() {
+    # The direct usage is intended as `print` is rather lowlevel
+    # shellcheck disable=2059
+    printf "$*";
+};
+println() {
+    # The direct usage is intended as `println` is rather lowlevel
+    # shellcheck disable=2059
+    printf "$*\n";
+};
+eprint() {
+    >&2 print "$@";
+};
+eprintln() {
+    >&2 println "$@";
+};
+
+if [ -n "$NO_COLOR" ];then
+    error() {
+        eprintln "==> ERROR:" "$*";
+    };
+    warning() {
+        eprintln "==> WARNING:" "$*";
+    };
+    debug() {
+        [ -n "$SHELL_LIBRARY_DEBUG" ] && eprintln "==> [Debug:]" "$*";
+    };
+    debug2() {
+        [ -n "$SHELL_LIBRARY_DEBUG" ] && eprintln " -> [Debug:]" "$*";
+    };
+    msg() {
+        eprintln "==>" "$*";
+    };
+    msg2() {
+        eprintln " ->" "$*";
+    };
+    prompt() {
+        eprint "..>" "$*";
+    };
+else
+    # See https://stackoverflow.com/a/33206814 for ansi codes
+    error() {
+        eprintln "\033[1;91m==> ERROR:\033[0m" "\033[1;93m$*\033[0m";
+    };
+    warning() {
+        eprintln "\033[1;91m==> WARNING:\033[0m" "\033[1;93m$*\033[0m";
+    };
+    debug() {
+        [ -n "$SHELL_LIBRARY_DEBUG" ] && eprintln "\033[1;94m==> [Debug:]\033[0m" "\033[1;93m$*\033[0m";
+    };
+    debug2() {
+        [ -n "$SHELL_LIBRARY_DEBUG" ] && eprintln "\033[1;94m -> [Debug:]\033[0m" "\033[1;93m$*\033[0m";
+    };
+    msg() {
+        eprintln "\033[1;96m==>\033[0m" "\033[1;93m$*\033[0m";
+    };
+    msg2() {
+        eprintln "\033[1;96m ->\033[0m" "\033[1;93m$*\033[0m";
+    };
+    prompt() {
+        eprint "\033[1;96m..>\033[0m" "\033[1;93m$*\033[0m";
+    };
+fi
+
+mktmp() {
+    ensure_tmp_dir;
+    mktemp -p "$SHELL_LIBRARY_TEMP_PREFIX_DIR";
+}
+
+ensure_tmp_dir() {
+    if ! [ -d "$SHELL_LIBRARY_TEMP_PREFIX_DIR" ];then
+        SHELL_LIBRARY_TEMP_PREFIX_DIR="$(mktemp -d)";
+    fi
+};
+
+# A new version of tmp, which allows you to specify the commandline args as normal
+# arguments
+tmp() {
+    if echo "$1" | grep -E ' ' -q; then
+        warn "Detected an old version of tmp, as there are spaces in the input string!"
+    fi
+
+    TEMP_DIR_WITH_DEL="$(mktmp)";
+    "$@" 1> "$TEMP_DIR_WITH_DEL";
+    echo "$TEMP_DIR_WITH_DEL";
+};
+
+# Takes a path to search as argument.
+# Also takes further arguments as names to search for.
+# Prints the path to a file, if a file matching the given name is found.
+search_dir_for_file() {
+    [ -d "$1" ] || die "Arg $1 is not a directory";
+    directory="$1" && shift 1;
+
+    while read -r dir_entry; do
+        dir_entry_count=$((dir_entry_count + 1));
+        dir_entry_basename="$(basename "$dir_entry")";
+
+        for name in "$@";do
+            if [ "$name" = "$dir_entry_basename" ]; then
+                println "$dir_entry";
+            fi
+        done
+    done < "$(tmp fd . "$directory" --type file --max-depth 1)"
+    print "";
+}
+
+# Returns the path to the directory which contains all the specified files:
+# `search_upward_files file1 file2 file3` returns a path containing file1 ...
+search_upward_files() {
+    directory="$(pwd)";
+    final_directory="";
+    output="$(mktmp)";
+    while [ "$(wc -l < "$output")" = 0 ]; do
+        search_dir_for_file "$directory" "$@" > "$output";
+        directory="$(dirname "$directory")";
+        if [ "$directory" = "/" ]; then
+            warning "We bailed out, as there seems to be no directory containing $*";
+            final_directory="";
+            return;
+        fi
+    done
+    final_directory="$(dirname "$(head -n1 "$output")")";
+    print "$final_directory";
+}
+# }}}
+
+
+help() {
+    cat << EOF
+A test manager (for trixy integration tests)
+
+USAGE:
+    ./scripts/tests [OPTIONS] COMMAND
+
+OPTIONS:
+    --help   | -h
+                            Display this help and exit.
+
+COMMANDS:
+    update [TESTNAME]
+                            Updates the 'expected.md' file of a test with TESTNAME, if
+                            TESTNAME is blank, all tests are updated.
+
+    new TESTNAME
+                            Generates a new test from the '.template' directory and drops
+                            you into an editor for the 'input.tri' file.
+                            It will also generate the 'expected.md' file, after you close
+                            the editor.
+
+ARGUMENTS:
+    TESTNAME | *([a-zA-Z0-9]) := [[ false ]]
+                            The name of a test.
+                            (The notation above is only really useful, when
+                            the shell library is employed to generate
+                            a completion script.)
+
+EOF
+}
+
+ROOT_DIR="$(search_upward_files "Cargo.toml")";
+
+new() {
+    test_name="$1";
+    test_dir="$ROOT_DIR/tests/$test_name";
+
+    [ -d "$test_dir" ] && die "$test_dir already exists, refusing to override"
+
+    cp --recursive "$ROOT_DIR/tests/.template" "$test_dir"
+
+    sed --in-place "s|template|$test_name|g" "$test_dir/main.rs"
+
+    editor="${EDITOR:-$VI}"
+    "$editor" "$test_dir/input.tri"
+    update "$test_name"
+}
+
+update() {
+    test_name="$1"
+    test_dir="$ROOT_DIR/tests/$test_name";
+
+    if [ -n "$test_name" ]; then
+        cargo run --features build-binary -- \
+            "$test_dir/input.tri" generate all --no-vendored \
+            > "$test_dir/expected.md"
+    else
+        fd . "$ROOT_DIR/tests" --type directory --max-depth=1 --exec basename | while read -r dir; do
+            msg2 "Updating $dir.."
+            update "$dir"
+        done
+    fi
+}
+
+for arg in "$@"; do
+    case "$arg" in
+        "--help" | "-h")
+            help;
+            exit 0;
+            ;;
+    esac
+done
+
+
+case "$1" in
+    "update")
+        shift 1;
+        [ -n "$1" ] && test_name="$1"
+        update "$test_name";
+        ;;
+    "new")
+        shift 1;
+        test_name="$1";
+        [ -z "$test_name" ] && die "You must specify a TESTNAME"
+        new "$test_name";
+        ;;
+esac
+# vim: ft=sh