add dependency checker for whisper-cli and ffmpeg

internal/deps/deps_test.go

@@ -0,0 +1,71 @@
+package deps
+
+import (
+	"os/exec"
+	"testing"
+)
+
+func TestCheckWhisperCli(t *testing.T) {
+	status := CheckWhisperCli()
+
+	// behavior depends on system - just verify no panic and correct structure
+	if status.Installed {
+		if status.Path == "" {
+			t.Error("installed but path empty")
+		}
+	} else {
+		if status.Path != "" {
+			t.Error("not installed but path non-empty")
+		}
+	}
+}
+
+func TestCheckWhisperCli_NotInstalled(t *testing.T) {
+	// if whisper-cli is not in PATH, should return Installed=false
+	_, err := exec.LookPath("whisper-cli")
+	if err != nil {
+		status := CheckWhisperCli()
+		if status.Installed {
+			t.Error("expected Installed=false when whisper-cli not in PATH")
+		}
+		if status.Path != "" {
+			t.Error("expected empty path when not installed")
+		}
+	} else {
+		t.Skip("whisper-cli is installed, can't test not-installed case")
+	}
+}
+
+func TestCheckFFmpeg(t *testing.T) {
+	status := CheckFFmpeg()
+
+	if status.Installed {
+		if status.Path == "" {
+			t.Error("installed but path empty")
+		}
+	} else {
+		if status.Path != "" {
+			t.Error("not installed but path non-empty")
+		}
+	}
+}
+
+func TestCheckFFmpeg_Installed(t *testing.T) {
+	// ffmpeg is commonly installed - test if available
+	_, err := exec.LookPath("ffmpeg")
+	if err == nil {
+		status := CheckFFmpeg()
+		if !status.Installed {
+			t.Error("ffmpeg in PATH but Installed=false")
+		}
+		if status.Path == "" {
+			t.Error("ffmpeg installed but path empty")
+		}
+		// version should be populated
+		if status.Version == "" {
+			t.Error("ffmpeg installed but version empty")
+		}
+	} else {
+		t.Skip("ffmpeg not installed, can't test installed case")
+	}
+}