Mocking default SharedPreferences
So I have a class that takes in a Context through the constructor, and grabs the default SharedPreferences from it using:
PreferenceManager.getDefaultSharedPreferences(context)
I'm testing this class, and in my unit test I've written the following code to retrieve a mocked SharedPreferences instance when getSharedPreferences(String, int) is invoked:
Context context = mock(Context.class);
SharedPreferences sharedPreferences = mock(SharedPreferences.class);
when(context.getSharedPreferences(anyString(), anyInt()))
.thenReturn(sharedPreferences);
when(sharedPreferences.getString(anyString(), nullable(String.class)))
.thenReturn(tokenManager.getToken());
When I run the test for this class, it ends up with a null object instead of my mocked SharedPreferences instance. However, if I grab the SharedPreferences instance with context.getSharedPreferences("stubbed", 123), I end up with my mocked SharedPreferences code.
So why does PreferenceManager.getDefaultSharedPreferences(context) return null instance while directly calling getSharedPreferences on my mock Context returns my mocked SharedPreferences instance?
java
android mockito sharedpreferences asked Nov 16 '18 at 23:14
Jonathan ChiouJonathan Chiou
119213
add a comment |
So I have a class that takes in a Context through the constructor, and grabs the default SharedPreferences from it using:
PreferenceManager.getDefaultSharedPreferences(context)
I'm testing this class, and in my unit test I've written the following code to retrieve a mocked SharedPreferences instance when getSharedPreferences(String, int) is invoked:
Context context = mock(Context.class);
SharedPreferences sharedPreferences = mock(SharedPreferences.class);
when(context.getSharedPreferences(anyString(), anyInt()))
.thenReturn(sharedPreferences);
when(sharedPreferences.getString(anyString(), nullable(String.class)))
.thenReturn(tokenManager.getToken());
When I run the test for this class, it ends up with a null object instead of my mocked SharedPreferences instance. However, if I grab the SharedPreferences instance with context.getSharedPreferences("stubbed", 123), I end up with my mocked SharedPreferences code.
So why does PreferenceManager.getDefaultSharedPreferences(context) return null instance while directly calling getSharedPreferences on my mock Context returns my mocked SharedPreferences instance?
java
android mockito sharedpreferences asked Nov 16 '18 at 23:14
Jonathan ChiouJonathan Chiou
119213
did you check the code ofPreferenceManager.getDefaultSharedPreferences(context)? How does the PM get the data from thecontext?
– P.J.Meisch
Nov 17 '18 at 16:54
`return context.getSharedPreferences(getDefaultSharedPreferencesName(context), getDefaultSharedPreferencesMode());``
– Jonathan Chiou
Nov 19 '18 at 17:03
add a comment |
So I have a class that takes in a Context through the constructor, and grabs the default SharedPreferences from it using:
PreferenceManager.getDefaultSharedPreferences(context)
I'm testing this class, and in my unit test I've written the following code to retrieve a mocked SharedPreferences instance when getSharedPreferences(String, int) is invoked:
Context context = mock(Context.class);
SharedPreferences sharedPreferences = mock(SharedPreferences.class);
when(context.getSharedPreferences(anyString(), anyInt()))
.thenReturn(sharedPreferences);
when(sharedPreferences.getString(anyString(), nullable(String.class)))
.thenReturn(tokenManager.getToken());
When I run the test for this class, it ends up with a null object instead of my mocked SharedPreferences instance. However, if I grab the SharedPreferences instance with context.getSharedPreferences("stubbed", 123), I end up with my mocked SharedPreferences code.
So why does PreferenceManager.getDefaultSharedPreferences(context) return null instance while directly calling getSharedPreferences on my mock Context returns my mocked SharedPreferences instance?
java
android mockito sharedpreferences asked Nov 16 '18 at 23:14
Jonathan ChiouJonathan Chiou
119213
So I have a class that takes in a Context through the constructor, and grabs the default SharedPreferences from it using:
PreferenceManager.getDefaultSharedPreferences(context)
I'm testing this class, and in my unit test I've written the following code to retrieve a mocked SharedPreferences instance when getSharedPreferences(String, int) is invoked:
Context context = mock(Context.class);
SharedPreferences sharedPreferences = mock(SharedPreferences.class);
when(context.getSharedPreferences(anyString(), anyInt()))
.thenReturn(sharedPreferences);
when(sharedPreferences.getString(anyString(), nullable(String.class)))
.thenReturn(tokenManager.getToken());
When I run the test for this class, it ends up with a null object instead of my mocked SharedPreferences instance. However, if I grab the SharedPreferences instance with context.getSharedPreferences("stubbed", 123), I end up with my mocked SharedPreferences code.
So why does PreferenceManager.getDefaultSharedPreferences(context) return null instance while directly calling getSharedPreferences on my mock Context returns my mocked SharedPreferences instance?
java
android mockito sharedpreferences java
android mockito sharedpreferences asked Nov 16 '18 at 23:14
Jonathan ChiouJonathan Chiou
119213
asked Nov 16 '18 at 23:14
Jonathan ChiouJonathan Chiou
119213
asked Nov 16 '18 at 23:14
Jonathan ChiouJonathan Chiou
119213
asked Nov 16 '18 at 23:14
Jonathan ChiouJonathan Chiou
119213
asked Nov 16 '18 at 23:14
Jonathan ChiouJonathan Chiou
119213
119213
did you check the code ofPreferenceManager.getDefaultSharedPreferences(context)? How does the PM get the data from thecontext?
– P.J.Meisch
Nov 17 '18 at 16:54
`return context.getSharedPreferences(getDefaultSharedPreferencesName(context), getDefaultSharedPreferencesMode());``
– Jonathan Chiou
Nov 19 '18 at 17:03
add a comment |
did you check the code ofPreferenceManager.getDefaultSharedPreferences(context)? How does the PM get the data from thecontext?
– P.J.Meisch
Nov 17 '18 at 16:54
`return context.getSharedPreferences(getDefaultSharedPreferencesName(context), getDefaultSharedPreferencesMode());``
– Jonathan Chiou
Nov 19 '18 at 17:03
did you check the code of
PreferenceManager.getDefaultSharedPreferences(context)? How does the PM get the data from the context?– P.J.Meisch
Nov 17 '18 at 16:54
did you check the code of
PreferenceManager.getDefaultSharedPreferences(context)? How does the PM get the data from the context?– P.J.Meisch
Nov 17 '18 at 16:54
`return context.getSharedPreferences(getDefaultSharedPreferencesName(context), getDefaultSharedPreferencesMode());``
– Jonathan Chiou
Nov 19 '18 at 17:03
`return context.getSharedPreferences(getDefaultSharedPreferencesName(context), getDefaultSharedPreferencesMode());``
– Jonathan Chiou
Nov 19 '18 at 17:03
add a comment |
2 Answers
2
active
oldest
votes
Based on this document (https://developer.android.com/training/testing/unit-testing/local-unit-tests) and debugging the code line by line, the conclusion I've reached about why this occurs is because the android code used for unit tests in gradle is actually just a shell that returns stubbed values on every method invocation, so naturally that leads me to assume that the code for PreferenceManager.getDefaultSharedPreferences() that's being used in my unit tests is more or less return null.
answered Nov 19 '18 at 21:47
Jonathan ChiouJonathan Chiou
119213
add a comment |
So you need to mock the static call to PreferenceManager.getDefaultSharedPreferences(context). This is not possible at the moment with mockito, there is still discussion going on the corresponding issue.
One solution is shown in the accepted answer of this question, you could check PowerMock or JMockit as alternatives
answered Nov 20 '18 at 7:46
P.J.MeischP.J.Meisch
5,21642142
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Based on this document (https://developer.android.com/training/testing/unit-testing/local-unit-tests) and debugging the code line by line, the conclusion I've reached about why this occurs is because the android code used for unit tests in gradle is actually just a shell that returns stubbed values on every method invocation, so naturally that leads me to assume that the code for PreferenceManager.getDefaultSharedPreferences() that's being used in my unit tests is more or less return null.
answered Nov 19 '18 at 21:47
Jonathan ChiouJonathan Chiou
119213
add a comment |
Based on this document (https://developer.android.com/training/testing/unit-testing/local-unit-tests) and debugging the code line by line, the conclusion I've reached about why this occurs is because the android code used for unit tests in gradle is actually just a shell that returns stubbed values on every method invocation, so naturally that leads me to assume that the code for PreferenceManager.getDefaultSharedPreferences() that's being used in my unit tests is more or less return null.
answered Nov 19 '18 at 21:47
Jonathan ChiouJonathan Chiou
119213
add a comment |
Based on this document (https://developer.android.com/training/testing/unit-testing/local-unit-tests) and debugging the code line by line, the conclusion I've reached about why this occurs is because the android code used for unit tests in gradle is actually just a shell that returns stubbed values on every method invocation, so naturally that leads me to assume that the code for PreferenceManager.getDefaultSharedPreferences() that's being used in my unit tests is more or less return null.
answered Nov 19 '18 at 21:47
Jonathan ChiouJonathan Chiou
119213
Based on this document (https://developer.android.com/training/testing/unit-testing/local-unit-tests) and debugging the code line by line, the conclusion I've reached about why this occurs is because the android code used for unit tests in gradle is actually just a shell that returns stubbed values on every method invocation, so naturally that leads me to assume that the code for PreferenceManager.getDefaultSharedPreferences() that's being used in my unit tests is more or less return null.
answered Nov 19 '18 at 21:47
Jonathan ChiouJonathan Chiou
119213
answered Nov 19 '18 at 21:47
Jonathan ChiouJonathan Chiou
119213
answered Nov 19 '18 at 21:47
Jonathan ChiouJonathan Chiou
119213
answered Nov 19 '18 at 21:47
Jonathan ChiouJonathan Chiou
119213
119213
add a comment |
add a comment |
So you need to mock the static call to PreferenceManager.getDefaultSharedPreferences(context). This is not possible at the moment with mockito, there is still discussion going on the corresponding issue.
One solution is shown in the accepted answer of this question, you could check PowerMock or JMockit as alternatives
answered Nov 20 '18 at 7:46
P.J.MeischP.J.Meisch
5,21642142
add a comment |
So you need to mock the static call to PreferenceManager.getDefaultSharedPreferences(context). This is not possible at the moment with mockito, there is still discussion going on the corresponding issue.
One solution is shown in the accepted answer of this question, you could check PowerMock or JMockit as alternatives
answered Nov 20 '18 at 7:46
P.J.MeischP.J.Meisch
5,21642142
add a comment |
So you need to mock the static call to PreferenceManager.getDefaultSharedPreferences(context). This is not possible at the moment with mockito, there is still discussion going on the corresponding issue.
One solution is shown in the accepted answer of this question, you could check PowerMock or JMockit as alternatives
answered Nov 20 '18 at 7:46
P.J.MeischP.J.Meisch
5,21642142
So you need to mock the static call to PreferenceManager.getDefaultSharedPreferences(context). This is not possible at the moment with mockito, there is still discussion going on the corresponding issue.
One solution is shown in the accepted answer of this question, you could check PowerMock or JMockit as alternatives
answered Nov 20 '18 at 7:46
P.J.MeischP.J.Meisch
5,21642142
answered Nov 20 '18 at 7:46
P.J.MeischP.J.Meisch
5,21642142
answered Nov 20 '18 at 7:46
P.J.MeischP.J.Meisch
5,21642142
answered Nov 20 '18 at 7:46
P.J.MeischP.J.Meisch
5,21642142
5,21642142
add a comment |
add a comment |
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did you check the code of
PreferenceManager.getDefaultSharedPreferences(context)? How does the PM get the data from thecontext?– P.J.Meisch
Nov 17 '18 at 16:54
`return context.getSharedPreferences(getDefaultSharedPreferencesName(context), getDefaultSharedPreferencesMode());``
– Jonathan Chiou
Nov 19 '18 at 17:03