Add tests for IN.

Author: python-processing-unit

tests/cases/failing/in-arity-one.pre

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+IN(0d1)

tests/cases/failing/in-arity-three.pre

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+IN(0d1, [0d1], 0d2)

tests/cases/failing/in-arity-zero.pre

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+IN()

tests/cases/failing/in-second-non-tns-int.pre

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+IN(0d1, 0d2)

tests/cases/failing/in-second-non-tns-str.pre

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+IN(0d1, "not-a-tensor")

tests/cases/passing/in-basic-false.pre

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+ASSERT(NOT(IN(0d9, [0d1, 0d2, 0d3])))

tests/cases/passing/in-basic-true.pre

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+ASSERT(IN(0d2, [0d1, 0d2, 0d3]))

tests/cases/passing/in-rank2.pre

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+TNS: grid = [[0d1, 0d2], [0d3, 0d4]]
+
+ASSERT(IN(0d4, grid))
+ASSERT(NOT(IN(0d9, grid)))

tests/cases/passing/in-return-type.pre

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+ASSERT(EQ(TYPE(IN(0d1, [0d1])), "BOOL"))

tests/cases/passing/in-strings-bools.pre

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+ASSERT(IN("beta", ["alpha", "beta", "gamma"]))
+ASSERT(IN(FALSE, [TRUE, FALSE]))