1 files changed, 70 insertions, 0 deletions
diff --git a/internal/hexaiaction/cmdentry_runcommand_test.go b/internal/hexaiaction/cmdentry_runcommand_test.go
new file mode 100644
index 0000000..7c8aa5c
--- /dev/null
+++ b/internal/hexaiaction/cmdentry_runcommand_test.go
@@ -0,0 +1,70 @@
+package hexaiaction
+
+import (
+    "bytes"
+    "context"
+    "io"
+    "os"
+    "path/filepath"
+    "strings"
+    "testing"
+
+    "codeberg.org/snonux/hexai/internal/tmux"
+)
+
+func TestRunCommand_UIChild(t *testing.T) {
+    dir := t.TempDir()
+    in := filepath.Join(dir, "in.txt")
+    out := filepath.Join(dir, "out.txt")
+    _ = os.WriteFile(in, []byte("sel"), 0o600)
+    old := runFn
+    runFn = func(_ context.Context, _ io.Reader, w io.Writer, _ io.Writer) error { _, _ = io.WriteString(w, "OK"); return nil }
+    t.Cleanup(func(){ runFn = old })
+    opts := Options{Infile: in, Outfile: out, UIChild: true}
+    if err := RunCommand(context.Background(), opts, bytes.NewBuffer(nil), io.Discard, io.Discard); err != nil {
+        t.Fatalf("RunCommand UIChild: %v", err)
+    }
+    b, _ := os.ReadFile(out)
+    if string(b) != "OK" { t.Fatalf("outfile: %q", string(b)) }
+}
+
+func TestRunCommand_Tmux(t *testing.T) {
+    oldTTY := isTTYFn
+    oldAvail := tmuxAvailableFn
+    oldExec := osExecutableFn
+    oldSplit := splitRunFn
+    isTTYFn = func(_ uintptr) bool { return false }
+    tmuxAvailableFn = func() bool { return true }
+    osExecutableFn = func() (string, error) { return "/bin/hexai-action", nil }
+    splitRunFn = func(_ tmux.SplitOpts, argv []string) error {
+        for i := 0; i < len(argv)-1; i++ {
+            if argv[i] == "-outfile" && i+1 < len(argv) {
+                _ = os.WriteFile(argv[i+1], []byte("OUT"), 0o600)
+                break
+            }
+        }
+        return nil
+    }
+    defer func(){ isTTYFn = oldTTY; tmuxAvailableFn = oldAvail; osExecutableFn = oldExec; splitRunFn = oldSplit }()
+    var out bytes.Buffer
+    if err := RunCommand(context.Background(), Options{ForceTmux: true}, bytes.NewBufferString("X"), &out, io.Discard); err != nil {
+        t.Fatalf("RunCommand tmux: %v", err)
+    }
+    if out.String() != "OUT" { t.Fatalf("stdout: %q", out.String()) }
+}
+
+// Inline TTY path is exercised implicitly via other helpers; testing it directly
+// would require TTY simulation which is brittle in unit tests.
+
+func TestRunCommand_FallbackEcho(t *testing.T) {
+    oldTTY := isTTYFn
+    oldAvail := tmuxAvailableFn
+    isTTYFn = func(_ uintptr) bool { return false }
+    tmuxAvailableFn = func() bool { return false }
+    defer func(){ isTTYFn = oldTTY; tmuxAvailableFn = oldAvail }()
+    var out bytes.Buffer
+    if err := RunCommand(context.Background(), Options{NoTmux: true}, bytes.NewBufferString("Z"), &out, io.Discard); err != nil {
+        t.Fatalf("RunCommand fallback: %v", err)
+    }
+    if strings.TrimSpace(out.String()) != "Z" { t.Fatalf("stdout: %q", out.String()) }
+}