AndroidアプリのJUnitテスト

Question

私はJavaとAndroidが初めてで、このクラスの加算、減算、乗算、除算のJUnitテストを作成しようとしています。しかし、私は問題を抱えています。なぜなら、アプリは計算の代わりにスイッチケースを使用するからです。私は、通常、各メソッドを呼び出すときと同じように、スイッチケース関数を呼び出すようにテストを設定する方法を知らない。

誰でも私にいくつかのポインタを教えてもらえますか？

public class MainActivity extends AppCompatActivity { 

EditText etNum1; 
EditText etNum2; 

Button btnAdd; 
Button btnSub; 
Button btnMult; 
Button btnDiv; 

TextView tvResult; 

String oper = ""; 
/** 
* The {@link android.support.v4.view.PagerAdapter} that will provide 
* fragments for each of the sections. We use a 
* {@link FragmentPagerAdapter} derivative, which will keep every 
* loaded fragment in memory. If this becomes too memory intensive, it 
* may be best to switch to a 
* {@link android.support.v4.app.FragmentStatePagerAdapter}. 
*/ 
private SectionsPagerAdapter mSectionsPagerAdapter; 

/** 
* The {@link ViewPager} that will host the section contents. 
*/ 
private ViewPager mViewPager; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    FloatingActionButton fab = (FloatingActionButton)  findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
        .setAction("Action", null).show(); 
     } 
    }); 

    // Create the adapter that will return a fragment for each of the three 
    // primary sections of the activity. 
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 

    // Set up the ViewPager with the sections adapter. 
    mViewPager = (ViewPager) findViewById(R.id.container); 
    mViewPager.setAdapter(mSectionsPagerAdapter); 
    // find the elements 
    setContentView(R.layout.fragment_main); 

    etNum1 = (EditText) findViewById(R.id.etNum1); 
    etNum2 = (EditText) findViewById(R.id.etNum2); 

    btnAdd = (Button) findViewById(R.id.btnAdd); 
    btnSub = (Button) findViewById(R.id.btnSub); 
    btnMult = (Button) findViewById(R.id.btnMult); 
    btnDiv = (Button) findViewById(R.id.btnDiv); 

    tvResult = (TextView) findViewById(R.id.tvResult); 

    // set listeners 
    btnAdd.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      buttononClick(view); 
     } 
    }); 
    btnSub.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      buttononClick(view); 
     } 
    }); 
    btnMult.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      buttononClick(view); 
     } 
    }); 
    btnDiv.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      buttononClick(view); 
     } 
    }); 



} 

public void buttononClick(View v) { 
    /** 
    * Description: This method is the function that occurs when a user  clicks one of the buttons in the simple calculator 
    * Author: Randy Adkins 
    * Date: September 25, 2016 
    */ 
    float num1 = 0; 
    float num2 = 0; 
    float result = 0; 

    // check if the fields are empty 
    if (TextUtils.isEmpty(etNum1.getText().toString()) 
      || TextUtils.isEmpty(etNum2.getText().toString())) { 
     return; 
    } 

    // read EditText and fill variables with numbers 
    num1 = Float.parseFloat(etNum1.getText().toString()); 
    num2 = Float.parseFloat(etNum2.getText().toString()); 

    // defines the button that has been clicked and performs the corresponding operation 
    // write operation into oper, we will use it later for output 
    switch (v.getId()) { 
     case R.id.btnAdd: 
      oper = "+"; 
      result = num2 + num2; 
      break; 
     case R.id.btnSub: 
      oper = "-"; 
      result = num1 - num2; 
      break; 
     case R.id.btnMult: 
      oper = "*"; 
      result = num1 * num2; 
      break; 
     case R.id.btnDiv: 
      oper = "/"; 
      result = num1/num2; 
      break; 
     default: 
      break; 
    } 

    // form the output line 
    tvResult.setText(num1 + " " + oper + " " + num2 + " = " + result); 
} 
@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

/** 
* A placeholder fragment containing a simple view. 
*/ 
public static class PlaceholderFragment extends Fragment { 
    /** 
    * The fragment argument representing the section number for this 
    * fragment. 
    */ 
    private static final String ARG_SECTION_NUMBER = "section_number"; 

    public PlaceholderFragment() { 
    } 

    /** 
    * Returns a new instance of this fragment for the given section 
    * number. 
    */ 
    public static PlaceholderFragment newInstance(int sectionNumber) { 
     PlaceholderFragment fragment = new PlaceholderFragment(); 
     Bundle args = new Bundle(); 
     args.putInt(ARG_SECTION_NUMBER, sectionNumber); 
     fragment.setArguments(args); 
     return fragment; 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.fragment_main, container, false); 
     TextView textView = (TextView) rootView.findViewById(R.id.section_label); 
     textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER))); 
     return rootView; 
    } 
} 

/** 
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to 
* one of the sections/tabs/pages. 
*/ 
public class SectionsPagerAdapter extends FragmentPagerAdapter { 

    public SectionsPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     // getItem is called to instantiate the fragment for the given page. 
     // Return a PlaceholderFragment (defined as a static inner class below). 
     return PlaceholderFragment.newInstance(position + 1); 
    } 

    @Override 
    public int getCount() { 
     // Show 3 total pages. 
     return 3; 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     switch (position) { 
      case 0: 
       return "SECTION 1"; 
      case 1: 
       return "SECTION 2"; 
      case 2: 
       return "SECTION 3"; 
     } 
     return null; 
    } 
} 

}

Answer 1

いくつかの方法にスイッチケースの一部を移動します。必要なパラメータを渡して、結果を返します。

public float getValue(int id, float num1, float num2){ 
    float result = 0.0; 
    switch (id) { 
    case R.id.btnAdd: 
     oper = "+"; 
     result = num2 + num2; 
     break; 
    case R.id.btnSub: 
     oper = "-"; 
     result = num1 - num2; 
     break; 
    case R.id.btnMult: 
     oper = "*"; 
     result = num1 * num2; 
     break; 
    case R.id.btnDiv: 
     oper = "/"; 
     result = num1/num2; 
     break; 
    default: 
     break; 
} 
return result; 
}