feat: test for getContextFromPaths (#105)

* feat: test for getContextFromPaths

* fix: use testify

internal/llm/prompt/prompt_test.go

@@ -0,0 +1,57 @@
+package prompt
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/opencode-ai/opencode/internal/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetContextFromPaths(t *testing.T) {
+	t.Parallel()
+
+	tmpDir := t.TempDir()
+	_, err := config.Load(tmpDir, false)
+	if err != nil {
+		t.Fatalf("Failed to load config: %v", err)
+	}
+	cfg := config.Get()
+	cfg.WorkingDir = tmpDir
+	cfg.ContextPaths = []string{
+		"file.txt",
+		"directory/",
+	}
+	testFiles := []string{
+		"file.txt",
+		"directory/file_a.txt",
+		"directory/file_b.txt",
+		"directory/file_c.txt",
+	}
+
+	createTestFiles(t, tmpDir, testFiles)
+
+	context := getContextFromPaths()
+	expectedContext := fmt.Sprintf("# From:%s/file.txt\nfile.txt: test content\n# From:%s/directory/file_a.txt\ndirectory/file_a.txt: test content\n# From:%s/directory/file_b.txt\ndirectory/file_b.txt: test content\n# From:%s/directory/file_c.txt\ndirectory/file_c.txt: test content", tmpDir, tmpDir, tmpDir, tmpDir)
+	assert.Equal(t, expectedContext, context)
+}
+
+func createTestFiles(t *testing.T, tmpDir string, testFiles []string) {
+	t.Helper()
+	for _, path := range testFiles {
+		fullPath := filepath.Join(tmpDir, path)
+		if path[len(path)-1] == '/' {
+			err := os.MkdirAll(fullPath, 0755)
+			require.NoError(t, err)
+		} else {
+			dir := filepath.Dir(fullPath)
+			err := os.MkdirAll(dir, 0755)
+			require.NoError(t, err)
+			err = os.WriteFile(fullPath, []byte(path+": test content"), 0644)
+			require.NoError(t, err)
+		}
+	}
+}