...the Revolution of Lyon.

My interpretation.

that´s my interpretation(; or of what is likely to evolve (next or in the near future)

The events at the beginning of July 1789 became a first rehearsal of what would be the Revolution in Lyon.

http://www.wordreference.com/es/en/translation.asp?spen=ensa...
Spanish English
ensayo nm (prueba) test, trial n

ensayo nm rehearsal n


https://es.oxforddictionaries.com/translate/spanish-english/...
ensayo
rehearsal, n.

(de un espectáculo)
rehearsal

(prueba) trial
(prueba) test
(intento) attempt


http://www.bbc.co.uk/bitesize/ks3/history/uk_through_time/po...
In 1789, money problems forced the king to call the 'Estates General' - a kind of parliament. He wanted to raise taxes.

The Estates did not give him more money, but instead presented thousands of lists of complaints, known as 'cahiers'.

When the king tried to close down the Estates, the members took the 'Tennis Court Oath' on 20 June 1789. They declared themselves to be the 'National Assembly' and promised to keep meeting until the government was reformed and a new constitution was drawn up.

They were supported by the mob, which stormed the Bastille prison on 14 July 1789.

The National Assembly adopted the Rights of Man, which states that: "Men are born free and remain free and equal in rights". They also abolished feudal rules and set up a parliament, called the 'the Convention' similar to Britain's.


http://www.canyonspringshighschool.org/ourpages/auto/2015/11...
Fall of the Bastille
n the morning of July 14, 1789, a Parisian mob of some
eight thousand men and women in search of weapons
streamed toward the Bastille, a royal armory filled with arms
and ammunition. The Bastille was also a state prison.
Although it contained only seven prisoners at the time, in the
eyes of those angry Parisians it was a glaring symbol of the
government’s harsh policies. The armory was defended by
the Marquis de Launay and a small garrison of 114 men.


....
Background to the Revolution
The year 1789 witnessed two far-reaching events: the beginning of a new
United States of America and the beginning of the French Revolution. Compared
with the American Revolution, the French Revolution was more complex, more
violent, and far more radical. It tried to create both a new political order and a new
social order. Indeed, it has often been seen as a major
turning point in European political and social history.
The causes of the French Revolution include both
long-range problems and immediate forces. The
long-range causes are to be found in the condition of
French society. Before the revolution, French society
was based on inequality. France’s population of 27
million was divided, as it had been since the Middle
Ages, into three orders, or estates.


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Note added at 2 hrs (2018-07-04 19:07:52 GMT)
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Some other options:

preview/taste of things to come/a predictor of things to come/a watershed event. I particularly like "watershed event".

French Revolution | Causes and Timeline | HISTORY.com
www.history.com/topics/french-revolution
The French Revolution began in 1789 and ended in 1799 with the rise of Napoleon Bonaparte. ... Get the facts on HISTORY.com. ... The French Revolution was a **watershed event** in modern European history that began in 1789 and ended in the late 1790s with the ascent of Napoleon Bonaparte.

This is less accurate than attempt, but submitting it as an idea to consider. Given that it is being viewed in retrospect.