Add ShellSpec tests for getdeps

spec/getdeps_spec.sh

@@ -0,0 +1,71 @@
+Describe "getdeps.sh"
+  Include ./lib/getdeps/getdeps.sh
+
+  Describe "getdeps--help"
+    It "should show expected output when called"
+      # and "should return OK when called"
+
+      result() {
+        %text # NOTE: It does not screw up indentation.
+        #|Installs dependencies for a package.
+        #|usage: bpkg-getdeps [-h|--help]
+        #|   or: bpkg-getdeps
+      }
+
+      When call bpkg_getdeps --help
+      The output should eq "$(result)"
+      The status should be success # It can be omitted.
+    End
+  End
+
+  Describe "getdeps"
+    It "should complain when called without package.json being present"
+      setup() { cd /tmp; }
+      BeforeCall setup
+
+      When call bpkg_getdeps
+      The status should be failure
+      The output should include 'error: Unable to find `package.json'
+      # NOTE: Bug, it should be output to stderr
+    End
+
+    It "should complain when called without package.json being present"
+      # and "should not exit with error status when called without bpkg-json being present"
+
+      BeforeCall "LANG=C" # NOTE: Error messages are locale dependent
+
+      When call bpkg_getdeps
+      The error should include 'bpkg-json: command not found'
+      The status should be success # NOTE: It should be the error, IMO
+    End
+
+    It "should call bpkg-install when called with bpkg-json present"
+      # and "should return OK when called"
+
+      bpkg-json() { echo '["dependencies","mock-dependency"'; }
+      bpkg() { echo "$@"; }
+
+      When call bpkg_getdeps
+      The output should eq 'install mock-dependency'
+    End
+
+    It "should call bpkg-install for each dependency when called for multiple dependencies"
+
+      bpkg-json() {
+        %text
+        #|["dependencies","mock-dependency"
+        #|["dependencies","mock-dependency-1"
+        #|["dependencies","mock-dependency-2"
+        #|["dependencies","mock-dependency-3"
+      }
+
+      bpkg() { %puts "$@ "; }
+      # NOTE: Using `%puts` instead of `echo -n`. Because, it is not portable.
+      # In /bin/sh (modified bash) on macOS, `echo -n` will be output "-n".
+      # This is important when complying with the POSIX shell.
+
+      When call bpkg_getdeps
+      The output should eq 'install mock-dependency install mock-dependency-1 install mock-dependency-2 install mock-dependency-3 '
+    End
+  End
+End