das Testergebnis
test result
The result or evaluation that you receive after carrying out a test, exam, or investigation.
Das Testergebnis des Corona-Tests war zum Glück negativ.
The test result of the COVID test was negative, thankfully.

test result
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test result
The result or evaluation that you receive after carrying out a test, exam, or investigation.
Das Testergebnis des Corona-Tests war zum Glück negativ.
The test result of the COVID test was negative, thankfully.

The word is clearly composed of 'der Test' (the test) and 'das Ergebnis' (the result). The 's' in between is a linking s, which connects the two words. So the meaning is literally the result of a test.
Wann bekommen wir die Testergebnisse der Prüfung?
When will we get the test results from the exam?
For medical or scientific tests, the most common adjectives are 'positiv' (positive) and 'negativ' (negative). A positive test result often means that something was found (e.g., a disease), while a negative one means that nothing was found.
Sie war erleichtert, als sie ihr negatives Testergebnis erhielt.
She was relieved when she received her negative test result.
When it comes to product tests, the result is often introduced with the phrase 'laut Testergebnis' (according to the test result). This expression is often found in consumer magazines or on websites.
Laut Testergebnis hat diese Kamera das beste Preis-Leistungs-Verhältnis.
According to the test result, this camera has the best price-performance ratio.
result
'das Ergebnis' and 'das Testergebnis' both refer to a result. However, 'das Ergebnis' is more general and fits many situations, for example a calculation, a conversation, or an investigation. 'das Testergebnis' is used when a real test, exam, or systematic check has been carried out beforehand. This can be a medical test, a school exam, or a product test. Learners may confuse the words because a test result is also a result. If the test is important, 'Testergebnis' is more precise. Otherwise, 'Ergebnis' is usually enough.

Vor dem Termin wartet Frau Müller noch auf das Testergebnis aus dem Labor.
Before the appointment, Ms. Müller is still waiting for the test result from the lab.
Jan ist zufrieden, weil das Ergebnis der Planung gut aussieht.
Jan is satisfied because the result of the planning looks good.