diff --git a/slog.sh b/slog.sh
index 4bbf267..d06a339 100644
--- a/slog.sh
+++ b/slog.sh
@@ -6,10 +6,10 @@
 # Licensed under the MIT license
 # http://github.com/swelljoe/slog
 #--------------------------------------------------------------------------------------------------
-set -e  # Fail on first error
 
 # LOG_PATH - Define $LOG_PATH in your script to log to a file, otherwise
 # just writes to STDOUT.
+LOG_PATH=${LOG_PATH:-""}
 
 # LOG_LEVEL_STDOUT - Define to determine above which level goes to STDOUT.
 # By default, all log levels will be written to STDOUT.
@@ -26,10 +26,10 @@ SCRIPT_NAME="${SCRIPT_NAME#\./}"
 SCRIPT_NAME="${SCRIPT_NAME##/*/}"
 
 # Determines if we print colors or not
-if [ $(tty -s) ]; then
-    readonly INTERACTIVE_MODE="off"
-else
+if [ -t 1 ] && [ -n "$TERM" ]; then
     readonly INTERACTIVE_MODE="on"
+else
+    readonly INTERACTIVE_MODE="off"
 fi
 
 #--------------------------------------------------------------------------------------------------
@@ -61,20 +61,17 @@ prepare_log_for_nonterminal() {
 }
 
 log() {
-    local log_text="$1"
-    local log_level="$2"
-    local log_color="$3"
+    log_text="$1"
+    # Default level to "info"
+    log_level="${2:-INFO}"
+    log_color="${3:-${LOG_INFO_COLOR}}"
 
     # Levels for comparing against LOG_LEVEL_STDOUT and LOG_LEVEL_LOG
-    local LOG_LEVEL_DEBUG=0
-    local LOG_LEVEL_INFO=1
-    local LOG_LEVEL_SUCCESS=2
-    local LOG_LEVEL_WARNING=3
-    local LOG_LEVEL_ERROR=4
-
-    # Default level to "info"
-    [ -z ${log_level} ] && log_level="INFO";
-    [ -z ${log_color} ] && log_color="${LOG_INFO_COLOR}";
+    LOG_LEVEL_DEBUG=0
+    LOG_LEVEL_INFO=1
+    LOG_LEVEL_SUCCESS=2
+    LOG_LEVEL_WARNING=3
+    LOG_LEVEL_ERROR=4
 
     # Validate LOG_LEVEL_STDOUT and LOG_LEVEL_LOG since they'll be eval-ed.
     case $LOG_LEVEL_STDOUT in
diff --git a/tests/sloggi.sh b/tests/sloggi.sh
old mode 100644
new mode 100755
index 796451c..1035773
--- a/tests/sloggi.sh
+++ b/tests/sloggi.sh
@@ -10,8 +10,13 @@
 # XXX Output is not quite TAP, but should be. We could make a TAP mode for slog, or strip the
 # non-tap output in the log.
 
-LOG_PATH="./my.log"
-. ../slog.sh
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+readonly SCRIPT_DIR
+
+LOG_PATH="$SCRIPT_DIR/my.log"
+. "$SCRIPT_DIR/../slog.sh"
 
 log "ok 1 - This is regular log message... "
 
@@ -27,7 +32,7 @@ log_error "ok 5 - Whoops! I made a booboo"
 LOG_LEVEL_LOG="ERROR"
 log_info "ok 6 - This should only appear on the console and not in the log file"
 
-if [ -e ./my.log ]; then
+if [ -e "$LOG_PATH" ]; then
     # Did the log get created with actual data?
     grep -q Whoops "$LOG_PATH"
     if [ $? -eq 0 ]; then
@@ -53,3 +58,4 @@ log_debug "Uh oh. This should never show up in the log or the console."
 # Invalid log level...should default to info
 LOG_LEVEL_STDOUT="DOOTDOOT"
 log_info "ok 9 - This should show up, even though LOG_LEVEL_STDOUT set to $LOG_LEVEL_STDOUT."
+