Review fixes for aws-lambda-core-1.0:library (open-telemetry#17271)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>

Author: otelbot[bot]

instrumentation/aws-lambda/aws-lambda-core-1.0/library/src/main/java/io/opentelemetry/instrumentation/awslambdacore/v1_0/internal/HeadersFactory.java

@@ -32,7 +32,7 @@ static Map<String, String> ofStream(InputStream inputStream) {
       }
       while (parser.nextToken() != JsonToken.END_OBJECT) {
         parser.nextToken();
-        if (!parser.currentName().equals("headers")) {
+        if (!"headers".equals(parser.currentName())) {
           parser.skipChildren();
           continue;
         }

instrumentation/aws-lambda/aws-lambda-core-1.0/library/src/test/java/io/opentelemetry/instrumentation/awslambdacore/v1_0/AwsLambdaStreamWrapperHttpPropagationTest.java

@@ -147,7 +147,7 @@ public void handleRequest(InputStream input, OutputStream output, Context contex
         parser.nextToken();
         while (parser.nextToken() != JsonToken.END_OBJECT) {
           parser.nextToken();
-          if (!parser.currentName().equals("body")) {
+          if (!"body".equals(parser.currentName())) {
             parser.skipChildren();
             continue;
           }
@@ -156,7 +156,7 @@ public void handleRequest(InputStream input, OutputStream output, Context contex
         }
       }
       BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(output, UTF_8));
-      if (body.equals("hello")) {
+      if ("hello".equals(body)) {
         writer.write("world");
         writer.flush();
         writer.close();

instrumentation/aws-lambda/aws-lambda-core-1.0/library/src/test/java/io/opentelemetry/instrumentation/awslambdacore/v1_0/AwsLambdaStreamWrapperTest.java

@@ -124,7 +124,7 @@ public void handleRequest(InputStream input, OutputStream output, Context contex
       BufferedReader reader = new BufferedReader(new InputStreamReader(input, UTF_8));
       BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(output, UTF_8));
       String line = reader.readLine();
-      if (line.equals("hello")) {
+      if ("hello".equals(line)) {
         writer.write("world");
         writer.flush();
         writer.close();

instrumentation/aws-lambda/aws-lambda-core-1.0/library/src/test/java/io/opentelemetry/instrumentation/awslambdacore/v1_0/LambdaParametersTest.java

@@ -26,8 +26,7 @@ void shouldSetContextOnFirstPosition() throws NoSuchMethodException {
     // when
     Object[] params = LambdaParameters.toArray(method, "", context);
     // then
-    assertThat(params).hasSize(1);
-    assertThat(params[0]).isEqualTo(context);
+    assertThat(params).containsExactly(context);
   }
 
   @Test
@@ -39,9 +38,6 @@ void shouldSetContextOnTheLastPosition() throws NoSuchMethodException {
     // when
     Object[] params = LambdaParameters.toArray(method, "", context);
     // then
-    assertThat(params).hasSize(3);
-    assertThat(params[0]).isEqualTo("");
-    assertThat(params[1]).isNull();
-    assertThat(params[2]).isEqualTo(context);
+    assertThat(params).containsExactly("", null, context);
   }
 }