Tests: Integration tests to verify query expressions end-to-end

tests/test_expressions.py

@@ -0,0 +1,191 @@
+"""
+## About
+Integration tests to verify query expressions end-to-end.
+
+## Resources
+- https://pypi.org/project/prometheus-api-client/
+- https://prometheus.io/docs/prometheus/latest/querying/examples/
+- https://github.com/crate/cratedb-prometheus-adapter/blob/0.5.0/server.go#L124-L160
+"""
+
+
+def test_expression_plain(prometheus_client):
+    """
+    Verify a plain metrics query, without any label constraints.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+    }
+    """)
+    assert len(result) > 15
+
+
+def test_expression_eq_success(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using an equality match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        job = "prometheus"
+    }
+    """)
+    assert len(result) > 15
+
+
+def test_expression_eq_empty(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using an equality match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        job = "foobar"
+    }
+    """)
+    assert len(result) == 0
+
+
+def test_expression_neq_success(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using an inequality match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        job != "foobar"
+    }
+    """)
+    assert len(result) > 15
+
+
+def test_expression_neq_empty(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using an inequality match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        job != "prometheus"
+    }
+    """)
+    assert len(result) == 0
+
+
+def test_expression_re_success_basic(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using a regular expression match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        job =~ "prom.+"
+    }
+    """)
+    assert len(result) > 15
+
+
+def test_expression_re_success_dots(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using a regular expression match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        code =~ "2.."
+    }
+    """)
+    assert len(result) > 15
+
+
+def test_expression_re_success_or(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using a regular expression match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        code =~ "2..|3.."
+    }
+    """)
+    assert len(result) > 15
+
+
+def test_expression_re_empty(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using a regular expression match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        job =~ "foobar.+"
+    }
+    """)
+    assert len(result) == 0
+
+
+def test_expression_nre_success_basic(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using a negated regular expression match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        job !~ "foobar.+"
+    }
+    """)
+    assert len(result) > 15
+
+
+def test_expression_nre_success_dots(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using a negated regular expression match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        code !~ "5.."
+    }
+    """)
+    assert len(result) > 15
+
+
+def test_expression_nre_empty(prometheus_client):
+    """
+    Verify a metrics query, with a label constraint using a negated regular expression match.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        job !~ "prom.+"
+    }
+    """)
+    assert len(result) == 0
+
+
+def test_expression_all(prometheus_client):
+    """
+    Verify a metrics query, with label constraints using all types of label matchers.
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{
+        code = "200",
+        handler != "foobar",
+        job =~ "prom.+",
+        instance !~ "foobar",
+    }
+    """)
+    assert len(result) > 15
+
+
+def test_range_vector_selector_success(prometheus_client):
+    """
+    Verify range vector literals.
+
+    https://prometheus.io/docs/prometheus/latest/querying/basics/#range-vector-selectors
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{}[1s]
+    """)
+    assert len(result) > 15
+
+
+def test_range_vector_selector_empty(prometheus_client):
+    """
+    Verify range vector literals. With a minimal low value, it will produce zero results.
+
+    https://prometheus.io/docs/prometheus/latest/querying/basics/#range-vector-selectors
+    """
+    result = prometheus_client.custom_query(query="""
+    prometheus_http_requests_total{}[1ms]
+    """)
+    assert len(result) == 0