test: add test for loading custom configuration

Author: codejedi365

tests/example_project/releaserc.toml

@@ -0,0 +1,2 @@
+[semantic-release]
+commit_parser = "emoji"

tests/suite/test_publish_w_custom_config.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+__file__="$(realpath "${BASH_SOURCE[0]}")"
+__directory__="$(dirname "${__file__}")"
+
+if ! [ "${UTILS_LOADED}" = "true" ]; then
+    # shellcheck source=tests/utils.sh
+    source "$__directory__/../utils.sh"
+fi
+
+test_with_custom_config() {
+    # Using default configuration within PSR with no modifications
+    # triggering the NOOP mode to prevent errors since the repo doesn't exist
+    # We are just trying to test that the root options are passed to the action
+    # without a fatal error
+    local index="${1:?Index not provided}"
+    local test_name="${FUNCNAME[0]}"
+
+    # Create expectations & set env variables that will be passed in for Docker command
+    local WITH_VAR_GITHUB_TOKEN="ghp_1x2x3x4x5x6x7x8x9x0x1x2x3x4x5x6x7x8x9x0"
+    local WITH_VAR_NO_OPERATION_MODE="true"
+    local WITH_VAR_CONFIG_FILE="releaserc.toml"
+    local expected_psr_cmd=".*/bin/semantic-release -v --config releaserc.toml --noop publish"
+
+    # Execute the test & capture output
+    # Fatal errors if exit code is not 0
+    local output=""
+    if ! output="$(run_test "$index. $test_name" 2>&1)"; then
+        # Log the output for debugging purposes
+        log "$output"
+        error "fatal error occurred!"
+        error "::error:: $test_name failed!"
+        return 1
+    fi
+
+    # Evaluate the output to ensure the expected command is present
+    if ! printf '%s' "$output" | grep -q "$expected_psr_cmd"; then
+        # Log the output for debugging purposes
+        log "$output"
+        error "Failed to find the expected command in the output!"
+        error "\tExpected Command: $expected_psr_cmd"
+        error "::error:: $test_name failed!"
+        return 1
+    fi
+
+    log "\n$index. $test_name: PASSED!"
+}