samples(test): ignore string case when comparing outputs (googleapis#1402)

Author: kolea2

samples/snippets/src/test/java/com/example/datastore/queryprofile/QueryProfileSampleIT.java

@@ -64,7 +64,7 @@ public void testQueryProfileExplain() throws Exception {
     QueryProfileExplain.invoke();
 
     // Assert
-    systemsOutRule.assertContains("query_scope: Collection Group");
+    systemsOutRule.assertContains("query_scope: Collection group");
     systemsOutRule.assertContains("properties: (__name__ ASC)");
   }
 
@@ -74,7 +74,7 @@ public void testQueryProfileExplainAggregation() throws Exception {
     QueryProfileExplainAggregation.invoke();
 
     // Assert
-    systemsOutRule.assertContains("query_scope: Collection Group");
+    systemsOutRule.assertContains("query_scope: Collection group");
     systemsOutRule.assertContains("properties: (__name__ ASC)");
   }
 
@@ -86,7 +86,7 @@ public void testQueryProfileExplainAnalyze() throws Exception {
     // Assert
     systemsOutRule.assertContains("documents_scanned:");
     systemsOutRule.assertContains("index_entries_scanned:");
-    systemsOutRule.assertContains("query_scope: Collection Group");
+    systemsOutRule.assertContains("query_scope: Collection group");
     systemsOutRule.assertContains("Entity: Entity{key=");
   }
 
@@ -98,7 +98,7 @@ public void testQueryProfileExplainAnalyzeAggregation() throws Exception {
     // Assert
     systemsOutRule.assertContains("index_entries_scanned:");
     systemsOutRule.assertContains("documents_scanned:");
-    systemsOutRule.assertContains("query_scope: Collection Group");
+    systemsOutRule.assertContains("query_scope: Collection group");
     systemsOutRule.assertContains("Count: 2");
   }
 }

samples/snippets/src/test/java/com/rule/SystemsOutRule.java

@@ -48,6 +48,6 @@ public void evaluate() throws Throwable {
   }
 
   public void assertContains(String content) {
-    assertThat(currentOut.toString()).contains(content);
+    assertThat(currentOut.toString().toLowerCase()).contains(content.toLowerCase());
   }
 }