Never, there has never been nuclear tests of any kind on Easter Island.
No.However the first US hydrogen bomb test Ivy Mikecompletely destroyed an island (Eugelab in Enewetak Atoll), turning it into a crater.
The first hydrogen bomb test was Ivy Mike on the island of Eugelab in Eniwetok atoll. The device was a cylinder 80 feet tall and 20 feet in diameter weighing over 500 tons. The yield was 10 megatons. Eugelab ceased to be an island and became a water filled crater. This crater was later used for other lower yield hydrogen bomb tests in other series.
The hydrogen bomb was invented by a team of American scientists led by Edward Teller. The first successful test of the hydrogen bomb was conducted by the United States in 1952.
A hydrogen bomb was not dropped on Japan. It was dropped years later as a test and to determine how it acted in comparison to the plutonium and uranium bombs.
Some 43 nuclear tests were detonated at Enewetak from 1948 to 1958. The first hydrogen bomb test, code-named Mike, was tested on November 1, 1952. The explosion vaporized the island of Elugelab. This was done for testing.
The first test of a fusion (hydrogen) bomb required tons of equipment and supplies just to test several theories. There would be no way to package all of that into an air-deliverable bomb, or mashed up into the nosecone of a missile. Once the theories were proven, or failed, improvements were made and miniaturization, that then allowed the hydrogen bomb to be deliverable.
that we knew how to build one
The British tested the hydrogen bomb at Marilinga. There may have been more sites. See the attached link below.
1949 thru 1950 prompted by USSR atomic bomb test.
China's first nuclear test took place in 1964 and first hydrogen bomb test occurred in 1967.
The first hydrogen bomb was tested at the Enewetak Atoll (also known as the Ivy Mike test) in the Marshall Islands on November 1, 1952.
The hydrogen bomb was developed by a team of American physicists led by Edward Teller in the early 1950s.