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+Describe 'Main toolchain'
+    export PATH=$PWD/src:$PATH
+    export CPT_ROOT=$PWD/tests
+    export CPT_PATH=$PWD/tests/repository
+    install_dummy() { CPT_HOOK='' ./src/cpt bi dummy-pkg ;}
+    remove_dummy() { rm -rf "${CPT_ROOT:?}/var" ;}
+    BeforeAll install_dummy
+    AfterAll  remove_dummy
+
+    Describe 'cpt'
+
+        Describe '--version'
+            VERSION=$(grep VERSION config.rc | sed 's/.* //g')
+            It 'outputs cpt version'
+                When run script src/cpt --version
+                The stderr should eq "-> Carbs Packaging Tools $VERSION"
+            End
+        End
+
+        Describe '--help'
+            It 'outputs usage information'
+                When run script src/cpt --help
+                The line 1 of stderr should eq "-> Carbs Packaging Tool "
+            End
+        End
+
+        Describe 'prefix completion'
+            Describe 'single key expansion'
+                Parameters
+                    a alternatives
+                    b build
+                    c checksum
+                    d download
+                    i install
+                    l list
+                    r remove
+                    s search
+                    u update
+                End
+                It "completes '$1' single key prefix to '$2'"
+                    When run script src/cpt "$1" --help
+                    The status should eq 0
+                    The word 1 of line 1 should eq "usage:"
+                    The word 2 of line 1 should eq "cpt-$2"
+                End
+            End
+            Describe 'shortcut expansion'
+                Parameters
+                    bi "build install"
+                    cbi "checksum build install"
+                End
+                It "expands the '$1' shortcut to '$2'"
+                    When run script src/cpt "$1" --help
+                    The status should be success
+                    The word 2 of line 1 should eq "cpt-${2%% *}"
+                End
+            End
+        End
+
+
+        It 'fails when a given subcommand is not valid'
+            When run script src/cpt somerandomcommand
+            The stderr should eq "!> 'cpt somerandomcommand' is not a valid command "
+            The status should be failure
+        End
+    End
+
+   Describe 'cpt-list'
+       no_db_dir() {
+           # Return 0 if database directory is empty (or doesn't exist)
+           # shellcheck disable=2012
+           count=$(ls -1 "$CPT_ROOT/var/db/cpt/installed" 2>/dev/null | wc -l)
+           [ "$count" -eq 0 ]
+       }
+       Skip if "there are no installed packages" no_db_dir
+       It 'lists all packages when called without arguments'
+           When run script src/cpt-list
+           The lines of output should eq "$(ls -1 "$CPT_ROOT/var/db/cpt/installed" 2>/dev/null | wc -l)"
+       End
+           for firstpkg in "$CPT_ROOT/var/db/cpt/installed/"*; do firstpkg=${firstpkg##*/}; break; done
+       It 'only lists the packages given in the arguments'
+           When run script src/cpt-list "$firstpkg"
+           The word 1 of stdout should eq "$firstpkg"
+       End
+       It 'fails when the package supplied in the arguments does not exist'
+           When run script src/cpt-list somerandompackage
+           The stderr should eq "-> somerandompackage not installed"
+           The status should be failure
+       End
+       Parameters
+           "$firstpkg" success
+           somerandompackage failure
+       End
+       It "can print a $2 message with 'cpt-list --check PKG TRUE FALSE'"
+           When run script src/cpt-list --check "$1" success failure
+           The output should eq "$2"
+       End
+   End
+End