diff --git a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformationTestResult.java b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformationTestResult.java
index d0cad0c4a9..d0d93d3b9d 100644
--- a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformationTestResult.java
+++ b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformationTestResult.java
@@ -17,7 +17,6 @@ package com.google.android.exoplayer2.transformer;
 
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
-import com.google.android.exoplayer2.util.Assertions;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import org.json.JSONException;
 import org.json.JSONObject;
@@ -29,7 +28,7 @@ public class TransformationTestResult {
 
   /** A builder for {@link TransformationTestResult}. */
   public static class Builder {
-    @Nullable private TransformationResult transformationResult;
+    private final TransformationResult transformationResult;
     @Nullable private String filePath;
     private long elapsedTimeMs;
     private double ssim;
@@ -37,25 +36,12 @@ public class TransformationTestResult {
     @Nullable private Exception analysisException;
 
     /** Creates a new {@link Builder}. */
-    public Builder() {
+    public Builder(TransformationResult transformationResult) {
+      this.transformationResult = transformationResult;
       this.elapsedTimeMs = C.TIME_UNSET;
       this.ssim = SSIM_UNSET;
     }
 
-    /**
-     * Sets the {@link TransformationResult} of the transformation.
-     *
-     * <p>This field must be set.
-     *
-     * @param transformationResult The {@link TransformationResult}.
-     * @return This {@link Builder}
-     */
-    @CanIgnoreReturnValue
-    public Builder setTransformationResult(TransformationResult transformationResult) {
-      this.transformationResult = transformationResult;
-      return this;
-    }
-
     /**
      * Sets the file path of the output file.
      *
@@ -130,12 +116,7 @@ public class TransformationTestResult {
     /** Builds the {@link TransformationTestResult} instance. */
     public TransformationTestResult build() {
       return new TransformationTestResult(
-          Assertions.checkNotNull(transformationResult),
-          filePath,
-          elapsedTimeMs,
-          ssim,
-          testException,
-          analysisException);
+          transformationResult, filePath, elapsedTimeMs, ssim, testException, analysisException);
     }
   }
 
diff --git a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java
index e7b98efd1e..0bf8e41813 100644
--- a/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java
+++ b/library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java
@@ -297,10 +297,7 @@ public class TransformerAndroidTestRunner {
 
     // Block here until timeout reached or latch is counted down.
     boolean timeoutReached = !countDownLatch.await(timeoutSeconds, SECONDS);
-
-    TransformationTestResult.Builder testResultBuilder =
-        new TransformationTestResult.Builder()
-            .setElapsedTimeMs(SystemClock.DEFAULT.elapsedRealtime() - startTimeMs);
+    long elapsedTimeMs = SystemClock.DEFAULT.elapsedRealtime() - startTimeMs;
 
     @Nullable Exception unexpectedException = unexpectedExceptionReference.get();
     @Nullable
@@ -319,20 +316,21 @@ public class TransformerAndroidTestRunner {
     }
 
     if (testException != null) {
-      return testResultBuilder
-          .setTransformationResult(checkNotNull(transformationResultReference.get()))
+      return new TransformationTestResult.Builder(checkNotNull(transformationResultReference.get()))
+          .setElapsedTimeMs(elapsedTimeMs)
           .setTestException(testException)
           .build();
     }
 
     // No exceptions raised, transformation has succeeded.
-    testResultBuilder
-        .setTransformationResult(
-            checkNotNull(transformationResultReference.get())
-                .buildUpon()
-                .setFileSizeBytes(outputVideoFile.length())
-                .build())
-        .setFilePath(outputVideoFile.getPath());
+    TransformationTestResult.Builder testResultBuilder =
+        new TransformationTestResult.Builder(
+                checkNotNull(transformationResultReference.get())
+                    .buildUpon()
+                    .setFileSizeBytes(outputVideoFile.length())
+                    .build())
+            .setElapsedTimeMs(elapsedTimeMs)
+            .setFilePath(outputVideoFile.getPath());
 
     if (!requestCalculateSsim) {
       return testResultBuilder.build();