Solved grains in Bash

bash/grains/grains.bats

@@ -0,0 +1,81 @@
+#!/usr/bin/env bats
+load bats-extra
+
+# local version: 1.2.0.0
+
+@test "1" {
+  #[[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh 1
+  assert_success
+  assert_output "1"
+}
+
+@test "2" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh 2
+  assert_success
+  assert_output "2"
+}
+
+@test "3" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh 3
+  assert_success
+  assert_output "4"
+}
+
+@test "4" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh 4
+  assert_success
+  assert_output "8"
+}
+
+@test "16" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh 16
+  assert_success
+  assert_output "32768"
+}
+
+@test "32" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh 32
+  assert_success
+  assert_output "2147483648"
+}
+
+@test "64" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh 64
+  assert_success
+  assert_output "9223372036854775808"
+}
+
+@test "square 0 raises an exception" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh 0
+  assert_failure
+  assert_output "Error: invalid input"
+}
+
+@test "negative square raises an exception" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh -1
+  assert_failure
+  assert_output "Error: invalid input"
+}
+
+@test "square greater than 64 raises an exception" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh 65
+  assert_failure
+  assert_output "Error: invalid input"
+}
+
+@test "returns the total number of grains on the board" {
+  [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+  run bash grains.sh total
+  assert_success
+  assert_output "18446744073709551615"
+}