如何为 SharedPreference 创建单元测试用例？

Question

我想测试 SharedPreference 的单元测试。 我不知道如何模拟这些值，我刚刚开始单元测试。 谁能给我这个方法的解决方案，我该如何测试这个方法。

public static void oneMethod(Context context) {
    SharedPreferences prefs = context.getSharedPreferences("Constant", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();
    editor.putInt("Value", 3);
    editor.apply();
    Model.setValue(true);
}

Answer 1

我写了一个共享偏好的类，你可以很容易地使用和测试

package ir.hfathi.students.helper;

import android.content.Context;
import android.content.SharedPreferences;

import androidx.annotation.Nullable;

/**
 * Created by Hamid on 07/05/2017.
 */

public class AppPreferenceTools {
    private SharedPreferences mPreference;
    private Context mContext;
    Methods method;

    public static final String STRING_PREF_UNAVAILABLE = "string preference unavailable";

    public AppPreferenceTools(Context context, String preferenceName) {
        if (method == null) method = new Methods();
        this.mContext = context;
        this.mPreference = this.mContext.getSharedPreferences(preferenceName, Context.MODE_PRIVATE);
    }

    public SharedPreferences getPreference() {
        return mPreference;
    }

    public void savePreferences(String name, String value) {
        mPreference.edit()
                .putString(name, value)
                .apply();
    }

    public void savePreferences(String name, int value) {
        mPreference.edit()
                .putInt(name, value)
                .apply();
    }

    public void savePreferences(String name, Boolean value) {
        mPreference.edit()
                .putBoolean(name, value)
                .apply();
    }

    public void savePreferences(String name, int value, String PreferencesName) {
        this.mPreference = this.mContext.getSharedPreferences(PreferencesName, Context.MODE_PRIVATE);
        mPreference.edit()
                .putInt(name, value)
                .apply();
    }


    public String getName(String name, @Nullable String defaultSTR) {
        return mPreference.getString(name, defaultSTR);
    }

    public Boolean getName(String name, Boolean defaultBoolean) {
        return mPreference.getBoolean(name, defaultBoolean);
    }

    public String getName(String name, @Nullable String defaultSTR, String Preferences) {
        this.mPreference = this.mContext.getSharedPreferences(Preferences, Context.MODE_PRIVATE);
        return mPreference.getString(name, defaultSTR);
    }

    public int getName(String name, @Nullable int defaultSTR) {
        return mPreference.getInt(name, defaultSTR);
    }

    public int getName(String name, @Nullable int defaultSTR, String Preferences) {
        this.mPreference = this.mContext.getSharedPreferences(Preferences, Context.MODE_PRIVATE);
        return mPreference.getInt(name, defaultSTR);
    }

    public void removeAllPrefs() {
        mPreference.edit().clear().apply();
    }

    public void removeItemPrefs(String removeItem) {
        try {
            mPreference.edit().remove(removeItem).apply();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public int get_count_Preference() {
        return mPreference.getAll().size();
    }

}

我给出了一个如何使用它们的示例

        public AppPreferenceTools getAppPreferenceTools(Context context, String PreferenceName) {
            return new AppPreferenceTools(context, PreferenceName);
        }

getAppPreferenceTools(this, AppConfig.HELP_DASHBOARD)
    .getName(AppConfig.HELP_DASHBOARD+header, "non")

getAppPreferenceTools(this, AppConfig.HELP_DASHBOARD)
    .savePreferences(AppConfig.HELP_DASHBOARD+header, "show");