feat: enable running concrete test using :: and :line syntax

Add support for specifying test functions directly in the file path:
- `path::function_name` - filter by test function name
- `path:line_number` - run test containing the specified line

Closes #496

Author: Chemaclass

src/helpers.sh

@@ -372,3 +372,72 @@ function helper::generate_id() {
     echo "${sanitized_basename}_$$"
   fi
 }
+
+#
+# Parses a file path that may contain a filter suffix.
+# Supports two syntaxes:
+#   - path::function_name (filter by function name)
+#   - path:line_number (filter by line number)
+#
+# @param $1 string Eg: "tests/test.sh::test_foo" or "tests/test.sh:123"
+#
+# @return string Two lines: first is file path, second is filter (or empty)
+#
+function helper::parse_file_path_filter() {
+  local input="$1"
+  local file_path=""
+  local filter=""
+
+  # Check for :: syntax (function name filter)
+  if [[ "$input" == *"::"* ]]; then
+    file_path="${input%%::*}"
+    filter="${input#*::}"
+  # Check for :number syntax (line number filter)
+  elif [[ "$input" =~ ^(.+):([0-9]+)$ ]]; then
+    file_path="${BASH_REMATCH[1]}"
+    local line_number="${BASH_REMATCH[2]}"
+    # Line number will be resolved to function name later
+    filter="__line__:${line_number}"
+  else
+    file_path="$input"
+  fi
+
+  echo "$file_path"
+  echo "$filter"
+}
+
+#
+# Finds the test function that contains a given line number in a file.
+#
+# @param $1 string File path
+# @param $2 number Line number
+#
+# @return string The function name, or empty if not found
+#
+function helper::find_function_at_line() {
+  local file="$1"
+  local target_line="$2"
+
+  if [[ ! -f "$file" ]]; then
+    return 1
+  fi
+
+  # Find all test function definitions and their line numbers
+  local best_match=""
+  local best_line=0
+
+  while IFS=: read -r line_num content; do
+    # Extract function name from the line
+    local fn_name=""
+    if [[ "$content" =~ ^[[:space:]]*(function[[:space:]]+)?(test[a-zA-Z_][a-zA-Z0-9_]*)[[:space:]]*\(\) ]]; then
+      fn_name="${BASH_REMATCH[2]}"
+    fi
+
+    if [[ -n "$fn_name" && "$line_num" -le "$target_line" && "$line_num" -gt "$best_line" ]]; then
+      best_match="$fn_name"
+      best_line="$line_num"
+    fi
+  done < <(grep -n -E '^[[:space:]]*(function[[:space:]]+)?test[a-zA-Z_][a-zA-Z0-9_]*[[:space:]]*\(\)' "$file")
+
+  echo "$best_match"
+}

src/main.sh

@@ -73,13 +73,57 @@ function main::cmd_test() {
     shift
   done
 
-  # Expand positional arguments
+  # Expand positional arguments and extract inline filters
+  # Skip filter parsing for assert mode - args are not file paths
+  local inline_filter=""
+  local inline_filter_file=""
   if [[ ${#raw_args[@]} -gt 0 ]]; then
-    for arg in "${raw_args[@]}"; do
-      while IFS= read -r file; do
-        args+=("$file")
-      done < <(helper::find_files_recursive "$arg" '*[tT]est.sh')
-    done
+    if [[ -n "$assert_fn" ]]; then
+      # Assert mode: pass args as-is without file path processing
+      args=("${raw_args[@]}")
+    else
+      # Test mode: process file paths and extract inline filters
+      for arg in "${raw_args[@]}"; do
+        local parsed_path parsed_filter
+        {
+          read -r parsed_path
+          read -r parsed_filter
+        } < <(helper::parse_file_path_filter "$arg")
+
+        # If an inline filter was found, store it
+        if [[ -n "$parsed_filter" ]]; then
+          inline_filter="$parsed_filter"
+          inline_filter_file="$parsed_path"
+        fi
+
+        while IFS= read -r file; do
+          args+=("$file")
+        done < <(helper::find_files_recursive "$parsed_path" '*[tT]est.sh')
+      done
+
+      # Resolve line number filter to function name
+      if [[ "$inline_filter" == "__line__:"* ]]; then
+        local line_number="${inline_filter#__line__:}"
+        local resolved_file="${inline_filter_file}"
+
+        # If the file path was a pattern, use the first resolved file
+        if [[ ${#args[@]} -gt 0 ]]; then
+          resolved_file="${args[0]}"
+        fi
+
+        inline_filter=$(helper::find_function_at_line "$resolved_file" "$line_number")
+        if [[ -z "$inline_filter" ]]; then
+          printf "%sError: No test function found at line %s in %s%s\n" \
+            "${_COLOR_FAILED}" "$line_number" "$resolved_file" "${_COLOR_DEFAULT}"
+          exit 1
+        fi
+      fi
+
+      # Use inline filter if no -f filter was provided
+      if [[ -z "$filter" && -n "$inline_filter" ]]; then
+        filter="$inline_filter"
+      fi
+    fi
   fi
 
   # Optional bootstrap

tests/acceptance/bashunit_inline_filter_test.sh

@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+function set_up_before_script() {
+  TEST_ENV_FILE="tests/acceptance/fixtures/.env.default"
+}
+
+function test_double_colon_syntax_runs_specific_test() {
+  local output
+  output=$(./bashunit --no-parallel --env "$TEST_ENV_FILE" \
+    "tests/acceptance/fixtures/tests_path/a_test.sh::test_assert_empty")
+
+  assert_contains "1 passed" "$output"
+  assert_contains "Assert empty" "$output"
+}
+
+function test_double_colon_syntax_with_partial_match() {
+  local output
+  output=$(./bashunit --no-parallel --env "$TEST_ENV_FILE" \
+    "tests/acceptance/fixtures/tests_path/a_test.sh::test_assert")
+
+  assert_contains "2 passed" "$output"
+}
+
+function test_line_number_syntax_runs_specific_test() {
+  local output
+  # Line 4 should be inside test_assert_greater_and_less_than (starts at line 3)
+  output=$(./bashunit --no-parallel --env "$TEST_ENV_FILE" \
+    "tests/acceptance/fixtures/tests_path/a_test.sh:4")
+
+  assert_contains "passed" "$output"
+  assert_contains "Assert greater and less than" "$output"
+}
+
+function test_line_number_at_second_function() {
+  local output
+  # Line 9 should be inside test_assert_empty (starts at line 8)
+  output=$(./bashunit --no-parallel --env "$TEST_ENV_FILE" \
+    "tests/acceptance/fixtures/tests_path/a_test.sh:9")
+
+  assert_contains "1 passed" "$output"
+  assert_contains "Assert empty" "$output"
+}
+
+function test_line_number_before_any_test_shows_error() {
+  local output
+  output=$(./bashunit --no-parallel --env "$TEST_ENV_FILE" \
+    "tests/acceptance/fixtures/tests_path/a_test.sh:1" 2>&1) || true
+
+  assert_contains "No test function found" "$output"
+}
+
+function test_double_colon_syntax_no_match_runs_nothing() {
+  local output
+  output=$(./bashunit --no-parallel --env "$TEST_ENV_FILE" \
+    "tests/acceptance/fixtures/tests_path/a_test.sh::nonexistent_test")
+
+  assert_contains "0 total" "$output"
+}
+
+function test_regular_filter_option_still_works() {
+  local output
+  output=$(./bashunit --no-parallel --env "$TEST_ENV_FILE" \
+    --filter "test_assert_empty" "tests/acceptance/fixtures/tests_path/a_test.sh")
+
+  assert_contains "1 passed" "$output"
+}

tests/unit/helpers_test.sh

@@ -316,3 +316,91 @@ function test_find_total_tests_with_filter() {
 
   assert_same "3" "$(helpers_test::find_total_in_subshell "with_provider" "$file1" "$file2")"
 }
+
+function test_parse_file_path_filter_plain_path() {
+  local result
+  result=$(helper::parse_file_path_filter "tests/unit/example_test.sh")
+
+  local file_path filter
+  {
+    read -r file_path
+    read -r filter
+  } <<< "$result"
+
+  assert_same "tests/unit/example_test.sh" "$file_path"
+  assert_same "" "$filter"
+}
+
+function test_parse_file_path_filter_with_double_colon() {
+  local result
+  result=$(helper::parse_file_path_filter "tests/unit/example_test.sh::test_my_function")
+
+  local file_path filter
+  {
+    read -r file_path
+    read -r filter
+  } <<< "$result"
+
+  assert_same "tests/unit/example_test.sh" "$file_path"
+  assert_same "test_my_function" "$filter"
+}
+
+function test_parse_file_path_filter_with_line_number() {
+  local result
+  result=$(helper::parse_file_path_filter "tests/unit/example_test.sh:42")
+
+  local file_path filter
+  {
+    read -r file_path
+    read -r filter
+  } <<< "$result"
+
+  assert_same "tests/unit/example_test.sh" "$file_path"
+  assert_same "__line__:42" "$filter"
+}
+
+function test_parse_file_path_filter_with_colon_in_path() {
+  local result
+  result=$(helper::parse_file_path_filter "/path/to:weird/example_test.sh::test_func")
+
+  local file_path filter
+  {
+    read -r file_path
+    read -r filter
+  } <<< "$result"
+
+  assert_same "/path/to:weird/example_test.sh" "$file_path"
+  assert_same "test_func" "$filter"
+}
+
+function test_find_function_at_line_first_function() {
+  local file
+  file="$(current_dir)/fixtures/find_total_tests/simple_test.sh"
+
+  assert_same "test_first" "$(helper::find_function_at_line "$file" 4)"
+}
+
+function test_find_function_at_line_second_function() {
+  local file
+  file="$(current_dir)/fixtures/find_total_tests/simple_test.sh"
+
+  assert_same "test_second" "$(helper::find_function_at_line "$file" 8)"
+}
+
+function test_find_function_at_line_exact_function_line() {
+  local file
+  file="$(current_dir)/fixtures/find_total_tests/simple_test.sh"
+
+  assert_same "test_first" "$(helper::find_function_at_line "$file" 3)"
+}
+
+function test_find_function_at_line_before_any_function() {
+  local file
+  file="$(current_dir)/fixtures/find_total_tests/simple_test.sh"
+
+  assert_same "" "$(helper::find_function_at_line "$file" 1)"
+}
+
+function test_find_function_at_line_nonexistent_file() {
+  assert_general_error "$(helper::find_function_at_line "/nonexistent/file.sh" 10)"
+}