JUnit NoClassDefFoundError on org.junit.Assert itself

Question

I get the following error when running this code: (ColorMatrix getarray() returns a float[])

74 public void testHueShift() {
75     ColorMatrix cm1 = new ColorMatrix();
76     ColorMatrix cm2 = hueShift(0f);
77     assertArrayEquals(cm1.getArray(), cm2.getArray(), 0f);
78 }

the error:

 ----- begin exception -----
 java.lang.NoClassDefFoundError: org.junit.Assert
    at com.Common.lib.test.ColorFilterFactoryTest.testHueShift(ColorFilterFactoryTest.java:77)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at junit.framework.TestCase.runTest(TestCase.java:154)
    at junit.framework.TestCase.runBare(TestCase.java:127)
    at junit.framework.TestResult$1.protect(TestResult.java:106)
    at junit.framework.TestResult.runProtected(TestResult.java:124)
    at junit.framework.TestResult.run(TestResult.java:109)
    at junit.framework.TestCase.run(TestCase.java:118)
    at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
    at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
    at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:545)
    at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1551)
 ----- end exception -----

But the project build path has it:

EDIT
This is the Test class classpath

This is the class under test (It is a library project)

Answer 1

The stack trace contains the hint for the solution: It contains junit.framework.TestCase (so this class is on the classpath) but later, it can't find org.junit.Assert.

This looks as if you have JUnit 3.8 on the classpath when running the test but JUnit 4 when you compile them.

Find out how the unit test runner builds the classpath and fix it there.