stdin commander tests

Author: NLipatov

src/infrastructure/PAL/exec_commander/stdin_commander_test.go

@@ -0,0 +1,90 @@
+package exec_commander
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestStdinCommander_Run_Success(t *testing.T) {
+	c := NewStdinCommander("hello")
+
+	err := c.Run("/bin/cat")
+	if err != nil {
+		t.Fatalf("Run returned error: %v", err)
+	}
+}
+
+func TestStdinCommander_Run_Error(t *testing.T) {
+	c := NewStdinCommander("")
+
+	// nonexistent command → guaranteed error
+	err := c.Run("/definitely-not-exists")
+	if err == nil {
+		t.Fatalf("expected error, got nil")
+	}
+}
+
+func TestStdinCommander_Output(t *testing.T) {
+	c := NewStdinCommander("hello\n")
+
+	out, err := c.Output("/bin/cat")
+	if err != nil {
+		t.Fatalf("Output returned error: %v", err)
+	}
+
+	if string(out) != "hello\n" {
+		t.Fatalf("unexpected output: %q", out)
+	}
+}
+
+func TestStdinCommander_Output_Error(t *testing.T) {
+	c := NewStdinCommander("")
+
+	_, err := c.Output("/definitely-not-exists")
+	if err == nil {
+		t.Fatalf("expected error, got nil")
+	}
+}
+
+func TestStdinCommander_CombinedOutput(t *testing.T) {
+	c := NewStdinCommander("hello\n")
+
+	out, err := c.CombinedOutput("/bin/cat")
+	if err != nil {
+		t.Fatalf("CombinedOutput returned error: %v", err)
+	}
+
+	if string(out) != "hello\n" {
+		t.Fatalf("unexpected combined output: %q", out)
+	}
+}
+
+func TestStdinCommander_CombinedOutput_Error(t *testing.T) {
+	c := NewStdinCommander("")
+
+	out, err := c.CombinedOutput("/definitely-not-exists")
+	if err == nil {
+		t.Fatalf("expected error, got nil (output=%q)", out)
+	}
+}
+
+func TestStdinCommander_StdinConsumed(t *testing.T) {
+	c := NewStdinCommander("once")
+
+	out1, err := c.Output("/bin/cat")
+	if err != nil {
+		t.Fatalf("first output failed: %v", err)
+	}
+
+	out2, err := c.Output("/bin/cat")
+	if err != nil {
+		t.Fatalf("second output failed: %v", err)
+	}
+
+	if string(out1) != "once" {
+		t.Fatalf("unexpected first output: %q", out1)
+	}
+	if len(bytes.TrimSpace(out2)) != 0 {
+		t.Fatalf("expected empty stdin on second run, got %q", out2)
+	}
+}