tools/src/cmd/cts/common/config_test.go

// Copyright 2025 The Dawn & Tint Authors
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package common

import (
	"testing"

	"dawn.googlesource.com/dawn/tools/src/oswrapper"
	"github.com/stretchr/testify/require"
)

func TestLoadConfig_Success(t *testing.T) {
	wrapper := oswrapper.CreateFSTestOSWrapper()
	configContent := `{
		"Gerrit": {
			"Host": "dawn-review.googlesource.com",
			"Project": "dawn"
		}
	}`
	err := wrapper.WriteFile("config.json", []byte(configContent), 0644)
	require.NoError(t, err)

	cfg, err := LoadConfig("config.json", wrapper)
	require.NoError(t, err)
	require.NotNil(t, cfg)
	require.Equal(t, "dawn-review.googlesource.com", cfg.Gerrit.Host)
	require.Equal(t, "dawn", cfg.Gerrit.Project)
	require.Equal(t, wrapper, cfg.OsWrapper)
}

func TestLoadConfig_WithComments(t *testing.T) {
	wrapper := oswrapper.CreateFSTestOSWrapper()
	configContent := `{
		// This is a comment
		"Gerrit": {
			"Host": "dawn-review.googlesource.com",
			"Project": "dawn", // Trailing comma
		}
	}`
	err := wrapper.WriteFile("config.json", []byte(configContent), 0644)
	require.NoError(t, err)

	cfg, err := LoadConfig("config.json", wrapper)
	require.NoError(t, err)
	require.NotNil(t, cfg)
	require.Equal(t, "dawn-review.googlesource.com", cfg.Gerrit.Host)
}

func TestLoadConfig_FileError(t *testing.T) {
	wrapper := oswrapper.CreateFSTestOSWrapper()
	// File not created

	cfg, err := LoadConfig("nonexistent.json", wrapper)
	require.Error(t, err)
	require.Nil(t, cfg)
	require.ErrorContains(t, err, "failed to open 'nonexistent.json'")
}

func TestLoadConfig_JSONError(t *testing.T) {
	wrapper := oswrapper.CreateFSTestOSWrapper()
	configContent := `{ invalid json }`
	err := wrapper.WriteFile("config.json", []byte(configContent), 0644)
	require.NoError(t, err)

	cfg, err := LoadConfig("config.json", wrapper)
	require.Error(t, err)
	require.Nil(t, cfg)
	require.ErrorContains(t, err, "failed to load config")
}