Testing one's detective ability with 能力

Kanji Explanation: Ability and capability with 能

Conan finds himself in the clutches of dangerous pair, only to discover it’s his parents in disguise.

コナン:: 「ハハ…　それでオレが薬(くすり)で小(ちい)さくされた事情(じじょう)を阿笠(あがさ)博士(はかせ)に聞(き)いて、こんな悪巧(わるだく)みを仕組(しく)んだってわけか…」; “So you heard from Dr. Agasa about how I was shrunk by a drug and cooked up this evil scheme, huh...”
父(とう)さん:: 「悪巧(わるだく)みじゃないさ！　おまえの探偵(たんてい)としての能力(のうりょく)を試(ため)してんだよ…」; “It's not an evil scheme! I'm just testing your abilities as a detective...”; Literal: “It isn't an evil scheme! I'm testing your ability as a detective...”

Key Points

1能力(のうりょく) = ability or capacity

2探偵(たんてい)としての能力(のうりょく) means ability in the role of a detective

としての frames the standard or role being judged.
The father is specifically testing Conan’s competence as a detective, not as a child or son.

3試(ため)してんだよ is casual explanatory speech

試(ため)してんだ is a contraction of 試(ため)しているんだ.
It gives the line a relaxed but explanatory tone: “I’m testing you, that’s all.”

それで at the start of a sentence refers back to something previously said and introduces the result, much like “so” or “therefore” or “and then”.

事情 (Circumstances): 事情(じじょう) means the circumstances of a situation, including what led to it and why.
博士 (Doctor): 博士(はかせ) is a title for a learned expert or scientist, often translated as Doctor when attached to a name. The reading はくし refers to a doctoral degree or a person who holds one.
探偵 (Detective): 探偵(たんてい) means a detective or private investigator who gathers information about people or incidents.
能力 (Ability): 能力(のうりょく) means ability or capacity. It can be innate or developed through learning and experience.