Commit 89c2780 breaks java tests

[ngfgrant]

Starting at 89c2780 the tests for the java example break. I am working on a fix.

[riteshtendulkar]

Hi, can you please elaborate on what failure are you seeing?

[ngfgrant]

gradle test

> Task :compileTestJava
Note: /Users/niallgrant/Codebase/modulr-hmac/samples/java/src/test/java/com/modulr/api/ModulrApiAuthTest.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

> Task :test FAILED

com.modulr.api.ModulrApiAuthTest > testHmacGeneratorWithDatSupplier FAILED
    org.mockito.exceptions.base.MockitoException at ModulrApiAuthTest.java:81
        Caused by: java.lang.UnsupportedOperationException at ModulrApiAuthTest.java:81
            Caused by: java.lang.IllegalArgumentException at ModulrApiAuthTest.java:81

com.modulr.api.ModulrApiAuthTest > testHmacGeneratorWithNonNullToken FAILED
    org.mockito.exceptions.base.MockitoException at ModulrApiAuthTest.java:37
        Caused by: java.lang.UnsupportedOperationException at ModulrApiAuthTest.java:37
            Caused by: java.lang.IllegalArgumentException at ModulrApiAuthTest.java:81

com.modulr.api.ModulrApiAuthTest > testHmacGeneratorWithNullToken FAILED
    org.mockito.exceptions.base.MockitoException at ModulrApiAuthTest.java:72
        Caused by: java.lang.UnsupportedOperationException at ModulrApiAuthTest.java:72
            Caused by: java.lang.IllegalArgumentException at ModulrApiAuthTest.java:81

3 tests completed, 3 failed

Running gradle test before 89c2780 passes the tests...

[ngfgrant]

I've got a PR up that fixes things for me, along with some other minor refactoring. #8