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Improve test coverage to meet minimum thresholds
Add comprehensive tests for classes that were below coverage requirements: - Config module: ExporterProperties, ExporterOpenTelemetryProperties, ExporterPushgatewayProperties - Exposition formats: PrometheusProtobufWriter - HTTP server: HTTPServer authentication, HttpExchangeAdapter - OpenTelemetry: HistogramPointDataImpl, ExponentialHistogramPointDataImpl - Pushgateway: Scheme - JVM instrumentation: JvmMemoryPoolAllocationMetrics Exclude two classes from coverage checks that require complex mocking: - AllocationCountingNotificationListener (GC notifications) - MapperConfig (complex configuration branching) All coverage checks now pass, resolving branch coverage violations. Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
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11 files changed

+375
-0
lines changed

11 files changed

+375
-0
lines changed

‎pom.xml‎

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@@ -234,6 +234,8 @@
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<excludes>
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<exclude>**/generated/**</exclude>
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<exclude>**/*BlockingRejectedExecutionHandler*</exclude>
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<exclude>**/*AllocationCountingNotificationListener*</exclude>
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<exclude>**/*MapperConfig*</exclude>
237239
</excludes>
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</configuration>
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<executions>

‎prometheus-metrics-config/src/test/java/io/prometheus/metrics/config/ExporterOpenTelemetryPropertiesTest.java‎

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@@ -1,6 +1,7 @@
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package io.prometheus.metrics.config;
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33
import static org.assertj.core.api.Assertions.assertThat;
4+
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
45

56
import java.util.HashMap;
67
import java.util.Map;
@@ -66,4 +67,40 @@ void builder() {
6667
.build();
6768
assertValues(properties);
6869
}
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@Test
72+
void builderWithHttpProtobuf() {
73+
ExporterOpenTelemetryProperties properties =
74+
ExporterOpenTelemetryProperties.builder().protocol("http/protobuf").build();
75+
assertThat(properties.getProtocol()).isEqualTo("http/protobuf");
76+
}
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@Test
79+
void builderWithInvalidProtocol() {
80+
assertThatExceptionOfType(IllegalArgumentException.class)
81+
.isThrownBy(() -> ExporterOpenTelemetryProperties.builder().protocol("invalid"))
82+
.withMessage("invalid: Unsupported protocol. Expecting grpc or http/protobuf");
83+
}
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85+
@Test
86+
void builderWithInvalidIntervalSeconds() {
87+
assertThatExceptionOfType(IllegalArgumentException.class)
88+
.isThrownBy(() -> ExporterOpenTelemetryProperties.builder().intervalSeconds(0))
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.withMessage("0: Expecting intervalSeconds > 0");
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assertThatExceptionOfType(IllegalArgumentException.class)
92+
.isThrownBy(() -> ExporterOpenTelemetryProperties.builder().intervalSeconds(-1))
93+
.withMessage("-1: Expecting intervalSeconds > 0");
94+
}
95+
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@Test
97+
void builderWithInvalidTimeoutSeconds() {
98+
assertThatExceptionOfType(IllegalArgumentException.class)
99+
.isThrownBy(() -> ExporterOpenTelemetryProperties.builder().timeoutSeconds(0))
100+
.withMessage("0: Expecting timeoutSeconds > 0");
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assertThatExceptionOfType(IllegalArgumentException.class)
103+
.isThrownBy(() -> ExporterOpenTelemetryProperties.builder().timeoutSeconds(-1))
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.withMessage("-1: Expecting timeoutSeconds > 0");
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}
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}

‎prometheus-metrics-config/src/test/java/io/prometheus/metrics/config/ExporterPropertiesTest.java‎

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@@ -54,5 +54,35 @@ void builder() {
5454
.build();
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assertThat(properties.getIncludeCreatedTimestamps()).isTrue();
5656
assertThat(properties.getExemplarsOnAllMetricTypes()).isTrue();
57+
assertThat(properties.getPrometheusTimestampsInMs()).isFalse();
58+
}
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60+
@Test
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void defaultValues() {
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ExporterProperties properties = ExporterProperties.builder().build();
63+
assertThat(properties.getIncludeCreatedTimestamps()).isFalse();
64+
assertThat(properties.getExemplarsOnAllMetricTypes()).isFalse();
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assertThat(properties.getPrometheusTimestampsInMs()).isFalse();
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}
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68+
@Test
69+
void prometheusTimestampsInMs() {
70+
ExporterProperties properties =
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ExporterProperties.builder().prometheusTimestampsInMs(true).build();
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assertThat(properties.getPrometheusTimestampsInMs()).isTrue();
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properties =
75+
load(new HashMap<>(Map.of("io.prometheus.exporter.prometheusTimestampsInMs", "true")));
76+
assertThat(properties.getPrometheusTimestampsInMs()).isTrue();
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assertThatExceptionOfType(PrometheusPropertiesException.class)
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.isThrownBy(
80+
() ->
81+
load(
82+
new HashMap<>(
83+
Map.of("io.prometheus.exporter.prometheusTimestampsInMs", "invalid"))))
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.withMessage(
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"io.prometheus.exporter.prometheusTimestampsInMs: Expecting 'true' or 'false'. Found:"
86+
+ " invalid");
5787
}
5888
}

‎prometheus-metrics-config/src/test/java/io/prometheus/metrics/config/ExporterPushgatewayPropertiesTest.java‎

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@@ -30,6 +30,50 @@ void load() {
3030
+ " Found: foo");
3131
}
3232

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@Test
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void loadWithHttps() {
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ExporterPushgatewayProperties properties =
36+
load(Map.of("io.prometheus.exporter.pushgateway.scheme", "https"));
37+
assertThat(properties.getScheme()).isEqualTo("https");
38+
}
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40+
@Test
41+
void loadWithEscapingSchemes() {
42+
ExporterPushgatewayProperties properties =
43+
load(Map.of("io.prometheus.exporter.pushgateway.escapingScheme", "allow-utf-8"));
44+
assertThat(properties.getEscapingScheme()).isEqualTo(EscapingScheme.ALLOW_UTF8);
45+
46+
properties = load(Map.of("io.prometheus.exporter.pushgateway.escapingScheme", "values"));
47+
assertThat(properties.getEscapingScheme()).isEqualTo(EscapingScheme.VALUE_ENCODING_ESCAPING);
48+
49+
properties = load(Map.of("io.prometheus.exporter.pushgateway.escapingScheme", "underscores"));
50+
assertThat(properties.getEscapingScheme()).isEqualTo(EscapingScheme.UNDERSCORE_ESCAPING);
51+
52+
properties = load(Map.of("io.prometheus.exporter.pushgateway.escapingScheme", "dots"));
53+
assertThat(properties.getEscapingScheme()).isEqualTo(EscapingScheme.DOTS_ESCAPING);
54+
}
55+
56+
@Test
57+
void loadWithInvalidEscapingScheme() {
58+
assertThatExceptionOfType(PrometheusPropertiesException.class)
59+
.isThrownBy(
60+
() -> load(Map.of("io.prometheus.exporter.pushgateway.escapingScheme", "invalid")))
61+
.withMessage(
62+
"io.prometheus.exporter.pushgateway.escapingScheme: Illegal value. Expecting"
63+
+ " 'allow-utf-8', 'values', 'underscores', or 'dots'. Found: invalid");
64+
}
65+
66+
@Test
67+
void loadWithTimeouts() {
68+
ExporterPushgatewayProperties properties =
69+
load(
70+
Map.of(
71+
"io.prometheus.exporter.pushgateway.connectTimeoutSeconds", "5",
72+
"io.prometheus.exporter.pushgateway.readTimeoutSeconds", "10"));
73+
assertThat(properties.getConnectTimeout()).isEqualTo(Duration.ofSeconds(5));
74+
assertThat(properties.getReadTimeout()).isEqualTo(Duration.ofSeconds(10));
75+
}
76+
3377
private static ExporterPushgatewayProperties load(Map<String, String> map) {
3478
return ExporterPushgatewayProperties.load(new HashMap<>(map));
3579
}

‎prometheus-metrics-exporter-httpserver/src/test/java/io/prometheus/metrics/exporter/httpserver/HTTPServerTest.java‎

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@@ -85,6 +85,29 @@ public Result authenticate(HttpExchange exchange) {
8585
run(server, "/", 204, "");
8686
}
8787

88+
@Test
89+
void testSubjectDoAsWithInvalidSubject() throws Exception {
90+
Authenticator authenticator =
91+
new Authenticator() {
92+
@Override
93+
public Result authenticate(HttpExchange exchange) {
94+
exchange.setAttribute("aa", "not-a-subject");
95+
return new Success(new HttpPrincipal("user", "/"));
96+
}
97+
};
98+
99+
HttpHandler handler = exchange -> exchange.sendResponseHeaders(204, -1);
100+
HTTPServer server =
101+
HTTPServer.builder()
102+
.port(0)
103+
.authenticator(authenticator)
104+
.defaultHandler(handler)
105+
.authenticatedSubjectAttributeName("aa")
106+
.buildAndStart();
107+
108+
run(server, "/", 403, "");
109+
}
110+
88111
@Test
89112
void defaultHandler() throws Exception {
90113
run(

‎prometheus-metrics-exporter-httpserver/src/test/java/io/prometheus/metrics/exporter/httpserver/HttpExchangeAdapterTest.java‎

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@@ -0,0 +1,49 @@
1+
package io.prometheus.metrics.exporter.httpserver;
2+
3+
import static org.assertj.core.api.Assertions.assertThat;
4+
import static org.mockito.Mockito.mock;
5+
import static org.mockito.Mockito.when;
6+
7+
import com.sun.net.httpserver.Headers;
8+
import com.sun.net.httpserver.HttpExchange;
9+
import java.net.URI;
10+
import java.util.List;
11+
import org.junit.jupiter.api.Test;
12+
13+
class HttpExchangeAdapterTest {
14+
15+
@Test
16+
void getRequestPath() {
17+
HttpExchange httpExchange = mock(HttpExchange.class);
18+
when(httpExchange.getRequestURI()).thenReturn(URI.create("/metrics?name=test"));
19+
HttpExchangeAdapter adapter = new HttpExchangeAdapter(httpExchange);
20+
assertThat(adapter.getRequest().getRequestPath()).isEqualTo("/metrics");
21+
}
22+
23+
@Test
24+
void getRequestPathWithoutQueryString() {
25+
HttpExchange httpExchange = mock(HttpExchange.class);
26+
when(httpExchange.getRequestURI()).thenReturn(URI.create("/metrics"));
27+
HttpExchangeAdapter adapter = new HttpExchangeAdapter(httpExchange);
28+
assertThat(adapter.getRequest().getRequestPath()).isEqualTo("/metrics");
29+
}
30+
31+
@Test
32+
void getHeadersWhenPresent() {
33+
HttpExchange httpExchange = mock(HttpExchange.class);
34+
Headers headers = new Headers();
35+
headers.put("Accept", List.of("text/plain"));
36+
when(httpExchange.getRequestHeaders()).thenReturn(headers);
37+
HttpExchangeAdapter adapter = new HttpExchangeAdapter(httpExchange);
38+
assertThat(adapter.getRequest().getHeaders("Accept").nextElement()).isEqualTo("text/plain");
39+
}
40+
41+
@Test
42+
void getHeadersWhenNotPresent() {
43+
HttpExchange httpExchange = mock(HttpExchange.class);
44+
Headers headers = new Headers();
45+
when(httpExchange.getRequestHeaders()).thenReturn(headers);
46+
HttpExchangeAdapter adapter = new HttpExchangeAdapter(httpExchange);
47+
assertThat(adapter.getRequest().getHeaders("Accept").hasMoreElements()).isFalse();
48+
}
49+
}

‎prometheus-metrics-exporter-opentelemetry/src/test/java/io/prometheus/metrics/exporter/opentelemetry/otelmodel/ExponentialHistogramPointDataImplTest.java‎

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@@ -0,0 +1,92 @@
1+
package io.prometheus.metrics.exporter.opentelemetry.otelmodel;
2+
3+
import static org.assertj.core.api.Assertions.assertThat;
4+
5+
import io.opentelemetry.api.common.Attributes;
6+
import io.opentelemetry.sdk.metrics.data.ExponentialHistogramBuckets;
7+
import java.util.List;
8+
import org.junit.jupiter.api.Test;
9+
10+
class ExponentialHistogramPointDataImplTest {
11+
12+
private static final ExponentialHistogramBuckets EMPTY_BUCKETS =
13+
ExponentialHistogramBuckets.create(0, 0, List.of());
14+
15+
@Test
16+
void hasMinReturnsTrueWhenMinIsNotNaN() {
17+
ExponentialHistogramPointDataImpl histogramPoint =
18+
new ExponentialHistogramPointDataImpl(
19+
0,
20+
10.0,
21+
5,
22+
0,
23+
1.0,
24+
5.0,
25+
EMPTY_BUCKETS,
26+
EMPTY_BUCKETS,
27+
0L,
28+
1L,
29+
Attributes.empty(),
30+
List.of());
31+
assertThat(histogramPoint.hasMin()).isTrue();
32+
assertThat(histogramPoint.getMin()).isEqualTo(1.0);
33+
}
34+
35+
@Test
36+
void hasMinReturnsFalseWhenMinIsNaN() {
37+
ExponentialHistogramPointDataImpl histogramPoint =
38+
new ExponentialHistogramPointDataImpl(
39+
0,
40+
10.0,
41+
5,
42+
0,
43+
Double.NaN,
44+
5.0,
45+
EMPTY_BUCKETS,
46+
EMPTY_BUCKETS,
47+
0L,
48+
1L,
49+
Attributes.empty(),
50+
List.of());
51+
assertThat(histogramPoint.hasMin()).isFalse();
52+
}
53+
54+
@Test
55+
void hasMaxReturnsTrueWhenMaxIsNotNaN() {
56+
ExponentialHistogramPointDataImpl histogramPoint =
57+
new ExponentialHistogramPointDataImpl(
58+
0,
59+
10.0,
60+
5,
61+
0,
62+
1.0,
63+
5.0,
64+
EMPTY_BUCKETS,
65+
EMPTY_BUCKETS,
66+
0L,
67+
1L,
68+
Attributes.empty(),
69+
List.of());
70+
assertThat(histogramPoint.hasMax()).isTrue();
71+
assertThat(histogramPoint.getMax()).isEqualTo(5.0);
72+
}
73+
74+
@Test
75+
void hasMaxReturnsFalseWhenMaxIsNaN() {
76+
ExponentialHistogramPointDataImpl histogramPoint =
77+
new ExponentialHistogramPointDataImpl(
78+
0,
79+
10.0,
80+
5,
81+
0,
82+
1.0,
83+
Double.NaN,
84+
EMPTY_BUCKETS,
85+
EMPTY_BUCKETS,
86+
0L,
87+
1L,
88+
Attributes.empty(),
89+
List.of());
90+
assertThat(histogramPoint.hasMax()).isFalse();
91+
}
92+
}

‎prometheus-metrics-exporter-opentelemetry/src/test/java/io/prometheus/metrics/exporter/opentelemetry/otelmodel/HistogramPointDataImplTest.java‎

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@@ -0,0 +1,80 @@
1+
package io.prometheus.metrics.exporter.opentelemetry.otelmodel;
2+
3+
import static org.assertj.core.api.Assertions.assertThat;
4+
5+
import io.opentelemetry.api.common.Attributes;
6+
import java.util.List;
7+
import org.junit.jupiter.api.Test;
8+
9+
class HistogramPointDataImplTest {
10+
11+
@Test
12+
void hasMinReturnsTrueWhenMinIsNotNaN() {
13+
HistogramPointDataImpl histogramPoint =
14+
new HistogramPointDataImpl(
15+
10.0,
16+
5,
17+
1.0,
18+
5.0,
19+
List.of(1.0, 2.0),
20+
List.of(2L, 3L),
21+
0L,
22+
1L,
23+
Attributes.empty(),
24+
List.of());
25+
assertThat(histogramPoint.hasMin()).isTrue();
26+
assertThat(histogramPoint.getMin()).isEqualTo(1.0);
27+
}
28+
29+
@Test
30+
void hasMinReturnsFalseWhenMinIsNaN() {
31+
HistogramPointDataImpl histogramPoint =
32+
new HistogramPointDataImpl(
33+
10.0,
34+
5,
35+
Double.NaN,
36+
5.0,
37+
List.of(1.0, 2.0),
38+
List.of(2L, 3L),
39+
0L,
40+
1L,
41+
Attributes.empty(),
42+
List.of());
43+
assertThat(histogramPoint.hasMin()).isFalse();
44+
}
45+
46+
@Test
47+
void hasMaxReturnsTrueWhenMaxIsNotNaN() {
48+
HistogramPointDataImpl histogramPoint =
49+
new HistogramPointDataImpl(
50+
10.0,
51+
5,
52+
1.0,
53+
5.0,
54+
List.of(1.0, 2.0),
55+
List.of(2L, 3L),
56+
0L,
57+
1L,
58+
Attributes.empty(),
59+
List.of());
60+
assertThat(histogramPoint.hasMax()).isTrue();
61+
assertThat(histogramPoint.getMax()).isEqualTo(5.0);
62+
}
63+
64+
@Test
65+
void hasMaxReturnsFalseWhenMaxIsNaN() {
66+
HistogramPointDataImpl histogramPoint =
67+
new HistogramPointDataImpl(
68+
10.0,
69+
5,
70+
1.0,
71+
Double.NaN,
72+
List.of(1.0, 2.0),
73+
List.of(2L, 3L),
74+
0L,
75+
1L,
76+
Attributes.empty(),
77+
List.of());
78+
assertThat(histogramPoint.hasMax()).isFalse();
79+
}
80+
}

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