Fix two issues with kvstore (#637)

lib/kvstore.sh

@@ -45,9 +45,17 @@ kv_keys() {
   local keys=()
 
   if [[ -f $f ]]; then
-    # get list of keys
-    while IFS="=" read -r key value; do
+    # Iterate over each line, splitting on the '=' character
+    #
+    # The || [[ -n "$key" ]] statement addresses an issue with reading the last line
+    # of a file when there is no newline at the end. This will not happen if the file
+    # is created with this module, but can happen if it is written by hand.
+    # See: https://stackoverflow.com/questions/12916352/shell-script-read-missing-last-line
+    while IFS="=" read -r key value || [[ -n "$key" ]]; do
+      # if there are any empty lines in the store, skip them
+      if [[ -n $key ]]; then
         keys+=("$key")
+      fi
     done < "$f"
 
     echo "${keys[@]}" | tr ' ' '\n' | sort -u

test/unit

@@ -108,6 +108,26 @@ testKeyValue() {
   assertEquals "" "$(kv_list $store)"
 }
 
+testKeyValueNoNewLine() {
+  local store
+
+  # use a fixture that does not have an empty line after the final entry
+  store="$(pwd)/test/unit-fixtures/kvstore/no-new-line"
+
+  assertEquals "$(printf "%s\n" a=b b=c)" "$(kv_list $store)"
+  assertEquals "$(printf "%s\n" a b)" "$(kv_keys $store)" 
+}
+
+testKeyValueEmptyLine() {
+  local store
+
+  # use a fixture that has an extra empty line
+  store="$(pwd)/test/unit-fixtures/kvstore/empty-line"
+
+  assertEquals "$(printf "%s\n" a=b b=c)" "$(kv_list $store)"
+  assertEquals "$(printf "%s\n" a b)" "$(kv_keys $store)" 
+}
+
 testKeyValueEscaping() {
   local store=$(mktemp)
 

test/unit-fixtures/kvstore/empty-line

+
+a=b
+b=c

test/unit-fixtures/kvstore/no-new-line

+a=b
+b=c
\ No newline at end of file