You run a single test case as follows:
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Open the Java perspective
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In the Package Navigator, expand the test package

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Right-click on a test case (for example, CustomerTest.java) and select .
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Select the JUnit view to verify the result:

If there are 0 errors, then the test has succeeded. If there are errors, you need to check the Console view to locate the sources of them. The problem could be:
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The database is not started.
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The user name or password is wrong.
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The database is not generated.
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The mapping is wrong.