chore: set -euo pipefail to all tests/unit

Author: Chemaclass

tests/unit/assert_snapshot_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 function test_successful_assert_match_snapshot() {
   assert_empty "$(assert_match_snapshot "Hello World!")"

tests/unit/assert_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 function test_successful_fail() {
   true || fail "This cannot fail"

tests/unit/clock_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 __ORIGINAL_OS=""
 

tests/unit/console_results_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 function mock_all_state_getters() {
   mock state::is_duplicated_test_functions_found echo false

tests/unit/directory_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 function test_successful_assert_directory_exists() {
   local a_directory

tests/unit/file_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 function test_successful_assert_file_exists() {
   local a_file

tests/unit/helpers_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 function tear_down() {
   helper::unset_if_exists fake_function

tests/unit/redirect_error_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 _ERROR_LOG=temp_error.log
 

tests/unit/setup_teardown_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 TEST_COUNTER=1
 

tests/unit/skip_todo_test.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 function test_skip_output() {
   assert_equals\