63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
import math
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import os
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import infra.basetest
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class TestBc(infra.basetest.BRTest):
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config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
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"""
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BR2_PACKAGE_BC=y
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BR2_TARGET_ROOTFS_CPIO=y
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# BR2_TARGET_ROOTFS_TAR is not set
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"""
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def test_run(self):
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cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
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self.emulator.boot(arch="armv5",
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kernel="builtin",
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options=["-initrd", cpio_file])
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self.emulator.login()
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# Check the program executes.
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self.assertRunOk("bc --version")
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# We check a square root function of a number slightly larger
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# than 32 bits.
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value = 123456
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squared_value = value ** 2
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bc_expr = f"sqrt({squared_value})"
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cmd = f"echo '{bc_expr}' | bc"
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output, exit_code = self.emulator.run(cmd)
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self.assertEqual(exit_code, 0)
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self.assertEqual(int(output[0]), value)
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# Perform an integer exponentiation producing a large number.
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base = 3
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exponent = 4567
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expected_value = base ** exponent
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bc_expr = f"{base} ^ {exponent}"
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cmd = f"echo '{bc_expr}' | BC_LINE_LENGTH=0 bc"
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output, exit_code = self.emulator.run(cmd)
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self.assertEqual(exit_code, 0)
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self.assertEqual(int(output[0]), expected_value)
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# Test a basic output base conversion of a large number.
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hex_str = "DEADBEEF0000ABADC0DE00008BADF00D"
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hex_base = 16
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value = int(hex_str, base=hex_base)
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bc_expr = f"obase={hex_base} ; {value}"
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cmd = f"echo '{bc_expr}' | bc"
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output, exit_code = self.emulator.run(cmd)
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self.assertEqual(exit_code, 0)
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self.assertEqual(output[0], hex_str)
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# Test a floating point computation by estimating Pi. Since we
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# use the bc arc-tangent a() function, we need the '-l'
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# option.
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bc_expr = "4 * a(1)"
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cmd = f"echo '{bc_expr}' | bc -l"
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output, exit_code = self.emulator.run(cmd)
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self.assertEqual(exit_code, 0)
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self.assertAlmostEqual(float(output[0]), math.pi, places=16)
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