[bugfix] Remove duplicate entries in test listing

reframe/core/pipeline.py

@@ -1742,6 +1742,15 @@ def __str__(self):
         return "%s(name='%s', prefix='%s')" % (type(self).__name__,
                                                self.name, self.prefix)
 
+    def __eq__(self, other):
+        if not isinstance(other, RegressionTest):
+            return NotImplemented
+
+        return self.name == other.name
+
+    def __hash__(self):
+        return hash(self.name)
+
 
 class RunOnlyRegressionTest(RegressionTest, special=True):
     '''Base class for run-only regression tests.

unittests/test_pipeline.py

@@ -131,6 +131,24 @@ def _container_exec_ctx(platform):
     return _container_exec_ctx
 
 
+def test_eq():
+    class T0(rfm.RegressionTest):
+        def __init__(self):
+            self.name = 'T0'
+
+    class T1(rfm.RegressionTest):
+        def __init__(self):
+            self.name = 'T0'
+
+    t0, t1 = T0(), T1()
+    assert t0 == t1
+    assert hash(t0) == hash(t1)
+
+    t1.name = 'T1'
+    assert t0 != t1
+    assert hash(t0) != hash(t1)
+
+
 def test_environ_setup(hellotest, local_exec_ctx):
     # Use test environment for the regression check
     hellotest.variables = {'_FOO_': '1', '_BAR_': '2'}