test_package_filter_suppress_updates <- function() {
    .filter <- BiocInstaller:::.package_filter_suppress_updates
    pkgs0 <- matrix(
        character(), 0, 2,
        dimnames=list(NULL, c("Package", "LibPath")))
    checkIdentical(pkgs0, .filter(pkgs0, FALSE))
    checkIdentical(pkgs0, .filter(pkgs0, character()))
    p0 <- tempdir()
    pkgs <- matrix(
        c("Foo", "Bar", "Baz", p0, p0, p0), 3, 2,
        dimnames=list(c("Foo", "Bar", "Baz"), c("Package", "LibPath")))
    checkIdentical(pkgs, .filter(pkgs, FALSE))
    checkIdentical(pkgs[3,,drop=FALSE], .filter(pkgs, c("Foo", "Bar")))
    checkIdentical(pkgs0, .filter(pkgs, c("Foo", "Bar", "Baz")))
    checkIdentical(pkgs0, .filter(pkgs, ""))
}
test_package_filter_masked <- function() {
    .filter <- BiocInstaller:::.package_filter_masked
    pkgs0 <- matrix(
        character(), 0, 2,
        dimnames=list(NULL, c("Package", "LibPath")))
    checkIdentical(pkgs0, .filter(pkgs0))
    paths <- c(tempfile(), tempfile())
    for (path in paths) dir.create(path)
    oLibPaths <- .libPaths()
    on.exit(.libPaths(oLibPaths))
    .libPaths(paths)
    pkgs <- matrix(
        c("Foo", "Bar", "Baz", "Bim", paths, paths), 4, 2,
        dimnames=list(c("Foo", "Bar", "Baz", "Bim"), c("Package", "LibPath")))
    checkIdentical(pkgs, .filter(pkgs))
    checkIdentical(pkgs[c(1, 3, 2),], .filter(pkgs[c(1, 3, 2),]))
    pkgs <- matrix(
        c("Foo", "Bar", "Foo", paths, paths[2]), 3, 2,
        dimnames=list(c("Foo", "Bar", "Foo"), c("Package", "LibPath")))
    checkIdentical(pkgs[1:2,], .filter(pkgs))
    pkgs <- pkgs[3:1,]
    checkIdentical(pkgs[2:3,], .filter(pkgs))
}
test_package_filter_unwriteable <- function() {
    .filter <- BiocInstaller:::.package_filter_unwriteable
    ## setup
    dir.create(p0 <- tempfile())
    on.exit(unlink(p0, recursive=TRUE))
    pkgs0 <- matrix(
        character(), 0, 2,
        dimnames=list(NULL, c("Package", "LibPath")))
    pkgs <- pkgs0
    checkIdentical(pkgs, .filter(pkgs, NULL))
    checkIdentical(pkgs, .filter(pkgs, character()))
    checkIdentical(pkgs, .filter(pkgs, tempdir()))
    pkgs <- matrix(c("Foo", p0), 1, byrow=TRUE,
                   dimnames=list("Foo", c("Package", "LibPath")))
    checkIdentical(pkgs, .filter(pkgs, NULL))
    checkIdentical(pkgs, .filter(pkgs, p0))
    p1 <- tempfile()
    pkgs <- matrix(c("Foo", p1), 1, byrow=TRUE,
                   dimnames=list("Foo", c("Package", "LibPath")))
    checkIdentical(pkgs[FALSE,, drop=FALSE], .filter(pkgs, NULL))
    checkIdentical(pkgs[FALSE,, drop=FALSE], .filter(pkgs, p1))
    checkIdentical(pkgs, .filter(pkgs, p0))
    pkgs <- matrix(
        c("Foo", p0, "Bar", p1, "Baz", p0), 3, 2, byrow=TRUE,
        dimnames=list(c("Foo", "Bar", "Baz"), c("Package", "LibPath")))
    checkIdentical(pkgs[c(1, 3),], .filter(pkgs, NULL))
    checkIdentical(pkgs, .filter(pkgs, p0))
    checkIdentical(pkgs0, .filter(pkgs, p1))
    msg <- tryCatch(.filter(pkgs, NULL), message=conditionMessage)
    checkIdentical(
        "installation path not writeable, unable to update packages: Bar\n",
        msg)
    if (.Platform$OS.type == "windows")
        ## how to create a read-only directory?
        return(TRUE)
    dir.create(p2 <- tempfile(), mode="0400") # read but not write
    pkgs <- matrix(c("Foo", p2), 1, byrow=TRUE,
                   dimnames=list("Foo", c("Package", "LibPath")))
    checkIdentical(pkgs0, .filter(pkgs, NULL))
    pkgs <- matrix(
        c("Foo", p0, "Bar", p2, "Baz", p0), 3, 2, byrow=TRUE,
        dimnames=list(c("Foo", "Bar", "Baz"), c("Package", "LibPath")))
    checkIdentical(pkgs[c(1, 3),], .filter(pkgs, NULL))
    checkIdentical(pkgs0, .filter(pkgs, p2))
    Sys.chmod(p2, mode="0700")
    unlink(p2, recursive=TRUE)
}
test_writeable_biocLite <- function() {
    DEACTIVATED("too idiosyncratic for standardized testing")
    lib <- system.file(package="BiocInstaller", "unitTests", "cases",
                       "lib", "Biobase")
    dir.create(locked <- tempfile())
    file.copy(lib, locked, recursive=TRUE)
    oLibPaths <- .libPaths()
    on.exit(.libPaths(oLibPaths))
    .libPaths(c(locked, .libPaths()))
    Sys.chmod(locked, mode="0500")
    biocLite()                          #
    Sys.chmod(locked, mode="0700")
}
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