Test that setup runs once before each test

test/bats.bats

@@ -1,6 +1,11 @@
 #!/usr/bin/env bats
 
 FIXTURE_ROOT="$BATS_TEST_DIRNAME/fixtures"
+TMP="$BATS_TEST_DIRNAME/tmp"
+
+teardown() {
+  rm -f "$TMP"/*
+}
 
 @test "no arguments prints usage instructions" {
   run bats
@@ -46,3 +51,10 @@ FIXTURE_ROOT="$BATS_TEST_DIRNAME/fixtures"
   run bats "$FIXTURE_ROOT/environment.bats"
   [ $status -eq 0 ]
 }
+
+@test "setup is run once before each test" {
+  rm -f "$TMP/setup.log"
+  run bats "$FIXTURE_ROOT/setup.bats"
+  run cat "$TMP/setup.log"
+  [ ${#lines[@]} -eq 3 ]
+}

test/fixtures/setup.bats

@@ -0,0 +1,17 @@
+TMP="$BATS_TEST_DIRNAME/../tmp"
+
+setup() {
+  echo "$BATS_TEST_NAME" >> "$TMP/setup.log"
+}
+
+@test "one" {
+  true
+}
+
+@test "two" {
+  true
+}
+
+@test "three" {
+  true
+}

test/tmp/.gitignore

@@ -0,0 +1,2 @@
+*
+