Replace custom assertions with bats-assert

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "tests/vendor/bats-core"]
+	path = tests/vendor/bats-core
+	url = https://github.com/ztombol/bats-core
+[submodule "tests/vendor/bats-assert"]
+	path = tests/vendor/bats-assert
+	url = https://github.com/ztombol/bats-assert

tests/basher-init.bats

@@ -5,27 +5,27 @@ load test_helper
 @test "detects the shell" {
   SHELL=/bin/false run basher-init -
   assert_success
-  assert_line 0 'export BASHER_SHELL=bash'
+  assert_line -n 0 'export BASHER_SHELL=bash'
 }
 
 @test "exports BASHER_ROOT" {
   BASHER_ROOT=/lol run basher-init - bash
   assert_success
-  assert_line 1 'export BASHER_ROOT=/lol'
+  assert_line -n 1 'export BASHER_ROOT=/lol'
 }
 
 @test "adds cellar/bin to path" {
   run basher-init - bash
   assert_success
-  assert_line 2 'export PATH="$BASHER_ROOT/cellar/bin:$PATH"'
+  assert_line -n 2 'export PATH="$BASHER_ROOT/cellar/bin:$PATH"'
 }
 
 @test "setup basher completions if available" {
   mkdir -p "$BASHER_ROOT/completions"
   touch "$BASHER_ROOT/completions/basher.fakesh"
   run basher-init - fakesh
   assert_success
-  assert_line 3 'source "$BASHER_ROOT/completions/basher.fakesh"'
+  assert_line -n 3 'source "$BASHER_ROOT/completions/basher.fakesh"'
 }
 
 @test "does not setup basher completions if not available" {
@@ -40,11 +40,11 @@ load test_helper
 @test "setup package completions (bash)" {
   run basher-init - bash
   assert_success
-  assert_line 3 'for f in $(command ls "$BASHER_ROOT/cellar/completions/bash"); do source "$BASHER_ROOT/cellar/completions/bash/$f"; done'
+  assert_line -n 3 'for f in $(command ls "$BASHER_ROOT/cellar/completions/bash"); do source "$BASHER_ROOT/cellar/completions/bash/$f"; done'
 }
 
 @test "setup package completions (zsh)" {
   run basher-init - zsh
   assert_success
-  assert_line 3 'fpath=("$BASHER_ROOT/cellar/completions/zsh" $fpath)'
+  assert_line -n 3 'fpath=("$BASHER_ROOT/cellar/completions/zsh" $fpath)'
 }

tests/test_helper.bash

@@ -1,4 +1,5 @@
-load lib/assertions
+load vendor/bats-core/load
+load vendor/bats-assert/load
 
 export BASHER_TEST_DIR="${BATS_TMPDIR}/basher"
 export BASHER_ORIGIN_DIR="${BASHER_TEST_DIR}/origin"