Question: "A Test of Character" is an episode of the BBC sitcom Porridge, Porridge is a British sitcom first broadcast on BBC One from 1974 to what year?

Context paragraphs:
Poetic Justice (Porridge): "Poetic Justice" is an episode of the BBC sitcom Porridge.  It aired on 25 February 1977.  A new inmate arrives at Slade Prison.  Fletcher is astounded that the inmate is the judge who sentenced him to Slade Prison.

New Faces, Old Hands: "New Faces, Old Hands is the first episode of a series of the BBC sitcom "Porridge".  It first aired on 5 September 1974.  In this episode, Norman Stanley Fletcher, Lennie Godber and Cyril Heslop arrive at Slade Prison.

A Test of Character: "A Test of Character" is an episode of the BBC sitcom Porridge.  It aired on 18 March 1977.  Godber is studying for his O Level History exam, but doesn't want Fletcher's method of cheating.  Meanwhile, Fletcher and Warren are having a dispute on the solar system.

A Storm in a Teacup: "A Storm in a Teacup" is an episode of the BBC sitcom Porridge.  It aired on 18 February 1977.  In this episode, Fletcher is tasked by Grouty to replace a bottle of pills Harris stole.  But there is a surprise for Fletcher in his teacup.

Happy Release: "Happy Release" is an episode of the BBC sitcom Porridge.  It first aired on 21 November 1975.  In this episode, Fletcher and Blanco make a plan to get revenge on Norris for stealing Blanco's things.

Final Stretch (Porridge): "Final Stretch" is the final episode of the BBC sitcom Porridge, the sixth episode of the third series.  It first aired on 25 March 1977.  Godber's upcoming parole hearing is threatened by the prospect of a fight with fellow inmate Jarvis.  Meanwhile, Fletcher is suspicious of his daughter's holiday plans.

Prisoner and Escort: "Prisoner and Escort" is the pilot episode of the BBC sitcom "Porridge".  It was originally broadcast on 1 April 1973 as part of a project named "Seven of One".  In this episode, Norman Stanley Fletcher is transported from London to Slade Prison by Mr Mackay and Mr Barrowclough.

Porridge (TV series): Porridge is a British sitcom first broadcast on BBC One from 1974 to 1977, running for three series, two Christmas specials and a feature film also titled "Porridge" (released under the title "Doing Time" in the United States).  Written by Dick Clement and Ian La Frenais, it stars Ronnie Barker and Richard Beckinsale as two inmates at the fictional HMP Slade in Cumberland.  "Doing porridge" is British slang for serving a prison sentence, porridge once being the traditional breakfast in British prisons.

Pardon Me (Porridge): "Pardon Me" is an episode of the BBC sitcom Porridge.  It aired on 11 March 1977.  Blanco Webb is due to be paroled, but he doesn't accept it, as he would be admitting his guilt.  Fletcher and the rest of Slade Prison petition to the Home Office for Blanco to be pardoned.

Rough Justice (Porridge): "Rough Justice" is an episode of the BBC sitcom Porridge.  It aired on 4 March 1977.  When Judge Rawley's watch is stolen, they hold a kangaroo court with Harris as the suspect.

Supporting paragraphs: A Test of Character Porridge (TV series)
Answer: 1977