fn_registry/cmd/fn/run_bash_test.go

package main

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

// TestBashFunctionName verifies detection of library-style bash scripts
// that define a function matching the file basename.
func TestBashFunctionName(t *testing.T) {
	cases := []struct {
		name     string
		filename string
		content  string
		wantFn   string
	}{
		{
			name:     "library-style: defines matching function",
			filename: "gradle_unit_test.sh",
			content: `#!/usr/bin/env bash
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/gradle_run.sh"

gradle_unit_test() {
    local project_dir="$1"
    echo "running tests in $project_dir"
}
`,
			wantFn: "gradle_unit_test",
		},
		{
			name:     "library-style: defines matching function with space before parens",
			filename: "port_kill.sh",
			content: `#!/usr/bin/env bash
port_kill () {
    echo "killing port $1"
}
`,
			wantFn: "port_kill",
		},
		{
			name:     "top-level pipeline: no matching function",
			filename: "propose_capability_groups.sh",
			content: `#!/usr/bin/env bash
# inline pipeline logic
find_root() { echo "root"; }

while [[ $# -gt 0 ]]; do
    shift
done
`,
			wantFn: "",
		},
		{
			name:     "self-executing (has guard): no separate function detection needed",
			filename: "rsync_deploy.sh",
			content: `#!/usr/bin/env bash
rsync_deploy() {
    echo "deploying"
}
if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
    rsync_deploy "$@"
fi
`,
			// bashFunctionName should still return the function name — the
			// caller (buildBashCommand) decides which path to take based on
			// the guard, not this helper.
			wantFn: "rsync_deploy",
		},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			got := bashFunctionName("/tmp/"+tc.filename, tc.content)
			if got != tc.wantFn {
				t.Errorf("bashFunctionName(%q) = %q, want %q", tc.filename, got, tc.wantFn)
			}
		})
	}
}

// TestBuildBashCommand_LibraryStyle verifies that a library-style bash script
// (defines a function but has no self-invocation guard) is run by sourcing
// the script and calling the function — producing real stdout output.
func TestBuildBashCommand_LibraryStyle(t *testing.T) {
	dir := t.TempDir()

	// Write a library-style script: defines a function, no guard.
	scriptPath := filepath.Join(dir, "say_hello.sh")
	scriptContent := `#!/usr/bin/env bash
say_hello() {
    echo "hello from $1"
}
`
	if err := os.WriteFile(scriptPath, []byte(scriptContent), 0755); err != nil {
		t.Fatal(err)
	}

	cmd, err := buildBashCommand(scriptPath, []string{"world"})
	if err != nil {
		t.Fatalf("buildBashCommand error: %v", err)
	}

	out, err := cmd.Output()
	if err != nil {
		t.Fatalf("cmd.Output() error: %v", err)
	}

	got := strings.TrimSpace(string(out))
	want := "hello from world"
	if got != want {
		t.Errorf("output = %q, want %q", got, want)
	}
}

// TestBuildBashCommand_SelfGuard verifies that a script with the BASH_SOURCE
// guard is run directly (not via source+call) and still produces output.
func TestBuildBashCommand_SelfGuard(t *testing.T) {
	dir := t.TempDir()

	scriptPath := filepath.Join(dir, "say_hi.sh")
	scriptContent := `#!/usr/bin/env bash
say_hi() {
    echo "hi from $1"
}
if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
    say_hi "$@"
fi
`
	if err := os.WriteFile(scriptPath, []byte(scriptContent), 0755); err != nil {
		t.Fatal(err)
	}

	cmd, err := buildBashCommand(scriptPath, []string{"guard"})
	if err != nil {
		t.Fatalf("buildBashCommand error: %v", err)
	}

	out, err := cmd.Output()
	if err != nil {
		t.Fatalf("cmd.Output() error: %v", err)
	}

	got := strings.TrimSpace(string(out))
	want := "hi from guard"
	if got != want {
		t.Errorf("output = %q, want %q", got, want)
	}
}

// TestBuildBashCommand_TopLevelPipeline verifies that a pipeline script that
// runs top-level code directly (no function, no guard) produces output.
func TestBuildBashCommand_TopLevelPipeline(t *testing.T) {
	dir := t.TempDir()

	scriptPath := filepath.Join(dir, "my_pipeline.sh")
	scriptContent := `#!/usr/bin/env bash
echo "pipeline ran with $# args: $@"
`
	if err := os.WriteFile(scriptPath, []byte(scriptContent), 0755); err != nil {
		t.Fatal(err)
	}

	cmd, err := buildBashCommand(scriptPath, []string{"a", "b"})
	if err != nil {
		t.Fatalf("buildBashCommand error: %v", err)
	}

	out, err := cmd.Output()
	if err != nil {
		t.Fatalf("cmd.Output() error: %v", err)
	}

	got := strings.TrimSpace(string(out))
	want := "pipeline ran with 2 args: a b"
	if got != want {
		t.Errorf("output = %q, want %q", got, want)
	}
}