[TESTS] Add second native histogram with exemplars in TestProtobufParse

This test fails.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

model/textparse/protobufparse_test.go

@@ -695,6 +695,70 @@ metric: <
   timestamp_ms: 1234568
 >
 
+`,
+
+		`name: "test_histogram_with_native_histogram_exemplars2"
+help: "Another histogram with native histogram exemplars."
+type: HISTOGRAM
+metric: <
+  histogram: <
+    sample_count: 175
+    sample_sum: 0.0008280461746287094
+    bucket: <
+      cumulative_count: 2
+      upper_bound: -0.0004899999999999998
+    >
+    bucket: <
+      cumulative_count: 4
+      upper_bound: -0.0003899999999999998
+    >
+    bucket: <
+      cumulative_count: 16
+      upper_bound: -0.0002899999999999998
+    >
+    schema: 3
+    zero_threshold: 2.938735877055719e-39
+    zero_count: 2
+    negative_span: <
+      offset: -162
+      length: 1
+    >
+    negative_span: <
+      offset: 23
+      length: 4
+    >
+    negative_delta: 1
+    negative_delta: 3
+    negative_delta: -2
+    negative_delta: -1
+    negative_delta: 1
+    positive_span: <
+      offset: -161
+      length: 1
+    >
+    positive_span: <
+      offset: 8
+      length: 3
+    >
+    positive_delta: 1
+    positive_delta: 2
+    positive_delta: -1
+    positive_delta: -1
+    exemplars: <
+      label: <
+        name: "dummyID"
+        value: "59780"
+      >
+      value: -0.00039
+      timestamp: <
+        seconds: 1625851155
+        nanos: 146848499
+      >
+    >
+  >
+  timestamp_ms: 1234568
+>
+
 `,
 	}
 
@@ -1276,6 +1340,41 @@ func TestProtobufParse(t *testing.T) {
 						{Labels: labels.FromStrings("dummyID", "59772"), Value: -0.00052, HasTs: true, Ts: 1625851160156},
 					},
 				},
+				{
+					m:    "test_histogram_with_native_histogram_exemplars2",
+					help: "Another histogram with native histogram exemplars.",
+				},
+				{
+					m:   "test_histogram_with_native_histogram_exemplars2",
+					typ: model.MetricTypeHistogram,
+				},
+				{
+					m: "test_histogram_with_native_histogram_exemplars2",
+					t: 1234568,
+					shs: &histogram.Histogram{
+						Count:         175,
+						ZeroCount:     2,
+						Sum:           0.0008280461746287094,
+						ZeroThreshold: 2.938735877055719e-39,
+						Schema:        3,
+						PositiveSpans: []histogram.Span{
+							{Offset: -161, Length: 1},
+							{Offset: 8, Length: 3},
+						},
+						NegativeSpans: []histogram.Span{
+							{Offset: -162, Length: 1},
+							{Offset: 23, Length: 4},
+						},
+						PositiveBuckets: []int64{1, 2, -1, -1},
+						NegativeBuckets: []int64{1, 3, -2, -1, 1},
+					},
+					lset: labels.FromStrings(
+						"__name__", "test_histogram_with_native_histogram_exemplars2",
+					),
+					e: []exemplar.Exemplar{
+						{Labels: labels.FromStrings("dummyID", "59780"), Value: -0.00039, HasTs: true, Ts: 1625851155146},
+					},
+				},
 			},
 		},
 		{
@@ -2188,6 +2287,93 @@ func TestProtobufParse(t *testing.T) {
 						"le", "+Inf",
 					),
 				},
+				{ // 106
+					m:    "test_histogram_with_native_histogram_exemplars2",
+					help: "Another histogram with native histogram exemplars.",
+				},
+				{ // 107
+					m:   "test_histogram_with_native_histogram_exemplars2",
+					typ: model.MetricTypeHistogram,
+				},
+				{ // 108
+					m: "test_histogram_with_native_histogram_exemplars2",
+					t: 1234568,
+					shs: &histogram.Histogram{
+						Count:         175,
+						ZeroCount:     2,
+						Sum:           0.0008280461746287094,
+						ZeroThreshold: 2.938735877055719e-39,
+						Schema:        3,
+						PositiveSpans: []histogram.Span{
+							{Offset: -161, Length: 1},
+							{Offset: 8, Length: 3},
+						},
+						NegativeSpans: []histogram.Span{
+							{Offset: -162, Length: 1},
+							{Offset: 23, Length: 4},
+						},
+						PositiveBuckets: []int64{1, 2, -1, -1},
+						NegativeBuckets: []int64{1, 3, -2, -1, 1},
+					},
+					lset: labels.FromStrings(
+						"__name__", "test_histogram_with_native_histogram_exemplars2",
+					),
+					e: []exemplar.Exemplar{
+						{Labels: labels.FromStrings("dummyID", "59780"), Value: -0.00039, HasTs: true, Ts: 1625851155146},
+					},
+				},
+				{ // 109
+					m: "test_histogram_with_native_histogram_exemplars2_count",
+					t: 1234568,
+					v: 175,
+					lset: labels.FromStrings(
+						"__name__", "test_histogram_with_native_histogram_exemplars2_count",
+					),
+				},
+				{ // 110
+					m: "test_histogram_with_native_histogram_exemplars2_sum",
+					t: 1234568,
+					v: 0.0008280461746287094,
+					lset: labels.FromStrings(
+						"__name__", "test_histogram_with_native_histogram_exemplars2_sum",
+					),
+				},
+				{ // 111
+					m: "test_histogram_with_native_histogram_exemplars2_bucket\xffle\xff-0.0004899999999999998",
+					t: 1234568,
+					v: 2,
+					lset: labels.FromStrings(
+						"__name__", "test_histogram_with_native_histogram_exemplars2_bucket",
+						"le", "-0.0004899999999999998",
+					),
+				},
+				{ // 112
+					m: "test_histogram_with_native_histogram_exemplars2_bucket\xffle\xff-0.0003899999999999998",
+					t: 1234568,
+					v: 4,
+					lset: labels.FromStrings(
+						"__name__", "test_histogram_with_native_histogram_exemplars2_bucket",
+						"le", "-0.0003899999999999998",
+					),
+				},
+				{ // 113
+					m: "test_histogram_with_native_histogram_exemplars2_bucket\xffle\xff-0.0002899999999999998",
+					t: 1234568,
+					v: 16,
+					lset: labels.FromStrings(
+						"__name__", "test_histogram_with_native_histogram_exemplars2_bucket",
+						"le", "-0.0002899999999999998",
+					),
+				},
+				{ // 114
+					m: "test_histogram_with_native_histogram_exemplars2_bucket\xffle\xff+Inf",
+					t: 1234568,
+					v: 175,
+					lset: labels.FromStrings(
+						"__name__", "test_histogram_with_native_histogram_exemplars2_bucket",
+						"le", "+Inf",
+					),
+				},
 			},
 		},
 	}